Relevant bibliographies by topics / Gastropod molluscs

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  2. Dissertations / Theses
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Academic literature on the topic 'Gastropod molluscs'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Gastropod molluscs"

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Dharma, Bunjamin. "Molluscs Combing on The Coast of Karang Hawu, West Java." Jurnal Moluska Indonesia 4, no. 1 (April 1, 2020): 17–26. http://dx.doi.org/10.54115/jmi.v4i1.24.

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Karang Hawu Beach faces the Indian Ocean, so the presence of mollusks in the area varies widely and can increase in variety due to natural phenomena, such as earthquakes and tsunami outbreaks. The research objective was to obtain gastropods and bivalves (mollusks) by sweeping the Karang Hawu beach, West Java. Samples were collected from the coastal waters of Karang Hawu, West Java using the coastal sweeping method, then the samples were identified. The results showed that there were 3 classes of mollusks, namely: Cephalopod class, Bivalvia class, and Gastropod class with 42 families and 146 species of mollusks. Mollusks, with the highest gastropod class (38 families, 140 species), Bilavia class (3 families, 5 species), and Cephalopod class (1 family, 1 species). Results of the study concluded that based on the Molluscs sweeping the coast of Karang Hawu, West Java, it has a diversity of Molluscs, namely 146 species of mollusks from 3 classes, which were Gastropods, Bivalves, and Cephalopods.
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Stewart, Sarah E. "Distribution and palaeoecology of Ordovician bivalves and gastropods from Girvan, SW Scotland." Earth and Environmental Science Transactions of the Royal Society of Edinburgh 102, no. 3 (August 15, 2012): 145–58. http://dx.doi.org/10.1017/s175569101201002x.

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ABSTRACTMolluscs from the Middle and Upper Ordovician succession of Girvan, SW Scotland are common and diverse in some localities. The mollusc fauna consists mainly of gastropods, bivalves and various univalved molluscs (mimospirids and tergomyans), along with scarcer polyplacophorans, rostroconchs and cephalopods. The present study gives an overview of the distribution and palaeoecology of bivalves, gastropods and univalved molluscs and compares them with mollusc faunas worldwide. Gastropods, mimospirids and tergomyans are present from the Darriwilian (mid Llanvirn) onwards in both siliciclastic and carbonate facies, and increase in diversity through the Sandbian (Caradoc) and into the Katian (Ashgill). Bivalves first appeared in Girvan in the late Darriwilian (early Caradoc) in deep water siliciclastic facies; where they continued to be more abundant and diverse than in equivalent carbonate facies. Molluscs are initially Laurentian in aspect, though peri-Gondwanan faunal elements occur, particularly during the Sandbian. The pattern of bivalve and gastropod diversity found in the Ordovician of Girvan generally follows that of the known global diversity for these groups.
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Huan, Pin, Qian Wang, Sujian Tan, and Baozhong Liu. "Dorsoventral decoupling of Hox gene expression underpins the diversification of molluscs." Proceedings of the National Academy of Sciences 117, no. 1 (December 23, 2019): 503–12. http://dx.doi.org/10.1073/pnas.1907328117.

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In contrast to the Hox genes in arthropods and vertebrates, those in molluscs show diverse expression patterns with differences reported among lineages. Here, we investigate 2 phylogenetically distant molluscs, a gastropod and a polyplacophoran, and show that the Hox expression in both species can be divided into 2 categories. The Hox expression in the ventral ectoderm generally shows a canonical staggered pattern comparable to the patterns of other bilaterians and likely contributes to ventral patterning, such as neurogenesis. The other category of Hox expression on the dorsal side is strongly correlated with shell formation and exhibits lineage-specific characteristics in each class of mollusc. This generalized model of decoupled dorsoventral Hox expression is compatible with known Hox expression data from other molluscan lineages and may represent a key characteristic of molluscan Hox expression. These results support the concept of widespread staggered Hox expression in Mollusca and reveal aspects that may be related to the evolutionary diversification of molluscs. We propose that dorsoventral decoupling of Hox expression allowed lineage-specific dorsal and ventral patterning, which may have facilitated the evolution of diverse body plans in different molluscan lineages.
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Kobluk, David R., and Mary A. Lysenko. "Hurricane effects on shallow-water cryptic reef molluscs, Fiji Islands." Journal of Paleontology 67, no. 5 (September 1993): 798–816. http://dx.doi.org/10.1017/s0022336000037069.

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An assemblage of 343 species of cryptic, shelled molluscs was identified in three large samples from shallow subtidal and intertidal shelter habitats under rubble and corals at Malololailai Fiji in 1983, 1984, and 1985. One species was a polyplacophoran, 273 were gastropods (38 families), and 69 were bivalves (21 families). Cryptic gastropods were more abundant than bivalves, but showed a reduction in abundance relative to bivalves from 1983 to 1985. The abundances of many cryptic molluscs show dramatic adjustments from 1983 to 1985, chiefly due to hurricanes in 1983 and 1985, showing a decrease in equitability with increased physical disturbance. The abundance and diversity of molluscan predators in the crypts means that predation in these habitats may be substantial.The gastropod sample diversity showed the greatest change during the 1984 post-hurricane recovery period. The 1985 hurricanes affected the sample diversity by shifting the gastropod diversity closer to what it was after the 1983 hurricane. The bivalves underwent a similar shift in sample diversity, although larger numbers of individuals in proportionately more species survived the hurricanes.The cryptic bivalves exploited space in new crypts, while maintaining their rate of increase in abundance in the recovery period after the 1983 hurricane and through the two hurricanes in 1985. The gastropods declined in abundance after the 1983 hurricane. They recovered after the 1985 hurricanes by doubling their abundance, showing that they could exploit new resources in crypts. This increase in the gastropod population was not proportional to the increase in available cryptic space. This may mean they were still recovering in August 1985, or they may have been unable to capture their portion of cryptic space in competition with other organisms during recovery.The 1985 hurricanes did not have much effect on the overall molluscan diversity, a possible result of pruning by the 1983 hurricane of molluscs unable to survive storms. Because there was only a short interval between the hurricanes, many molluscs that survived the 1983 event were still in the population, so that the cryptic molluscs probably were better able to deal with the effects of the 1985 hurricanes than they would have been before the 1983 hurricane. The result was that the sample diversity after the 1983 hurricane increased during the recovery period but did not decline later even though the population was devastated by hurricanes in 1985. This lends support to intermediate disturbance models linking increasing or stable diversity with disturbances spaced at intervals allowing recovery.
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Izzatullaev, Zuvaidullo I., and Nilufar A. Ruzikulova. "Особенности экологии и жизненных циклов водных моллюсков Средней Азии." Бюллетень Дальневосточного малакологического общества 24, no. 1/2 (2020): 37–52. http://dx.doi.org/10.24866/1560-8425/2020-24/37-52.

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Рассмотрены особенности экологии водных моллюсков Средней Азии. Представлены оригинальные сведения по биологии 45 видов брюхоногих и двустворчатых моллюсков. Обсуждается влияние на жизненные циклы этих видов температуры, кислородного режима, освещенности, продолжительности безводного периода. Показана прямая зависимость между размерами моллюсков и продолжительностью их жизни. Ключевые слова: Средняя Азия, брюхоногие, двустворчатые моллюски, экологические группы, жизненный цикл, продолжительность жизни, размножение, генерация. Ecological patterns of aquatic mollusks of Central Asia are discussed and reviewed. Original data on biology of 45 gastropod and bivalve species are presented. The effect of temperature, oxygen regime, illumination and duration of waterless periods on mollusk life cycles is discussed. A direct relationship has been shown between the size of molluscs and their lifespan. Key words: Central Asia, gastropods, bivalves, ecological groups, life cycle, lifespan, reproduction, generation.
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Aji, Ludi Parwadani, and Andriani Widyastuti. "Molluscs Diversity in Coastal Ecosystem of South Biak, Papua." Oseanologi dan Limnologi di Indonesia 2, no. 1 (May 5, 2017): 25. http://dx.doi.org/10.14203/oldi.2017.v2i1.75.

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Coastal areas of Biak Island consist of three major ecosystems: the mangrove, seagrass beds, and coral reefs where a variety of molluscs live. Mollusc diversity in South Biak waters was investigated in September 2011. The observation was conducted at 4 locations, i.e. Paray, Ambroben, Yenures, and Sorido with 2 stations at each location. The study aimed to obtain information on the diversity and community structure of the benthic molluscs (gastropods and bivalves) on the coastal areas of South Biak waters. Sampling method applied was quadrate-transect line in intertidal areas from inshore to offshore. The molluscs (epifauna and infauna) found inside the quadrate-transect were counted and identified. The result showed high benthic mollusc diversity with a total of 94 species, consisting of 75 species of gastropods and 19 species of bivalves. The most widespread gastropod found in all stations was Nassarius sp., while for bivalves was Tellina sp. The highest value of diversity index (H) was 2.96 found in Paray 1 and the lowest was 0.58 in Yenures 1. The Evenness index (E) and Simpson index (D) ranged from 0.27 to 0.96 and from 0.06 to 0.72 respectively. Species richness (d) ranged from 2.89 to 6.84 and similarity index from 3.90 to 42.40.
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Zapata, Felipe, Nerida G. Wilson, Mark Howison, Sónia C. S. Andrade, Katharina M. Jörger, Michael Schrödl, Freya E. Goetz, Gonzalo Giribet, and Casey W. Dunn. "Phylogenomic analyses of deep gastropod relationships reject Orthogastropoda." Proceedings of the Royal Society B: Biological Sciences 281, no. 1794 (November 7, 2014): 20141739. http://dx.doi.org/10.1098/rspb.2014.1739.

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Gastropods are a highly diverse clade of molluscs that includes many familiar animals, such as limpets, snails, slugs and sea slugs. It is one of the most abundant groups of animals in the sea and the only molluscan lineage that has successfully colonized land. Yet the relationships among and within its constituent clades have remained in flux for over a century of morphological, anatomical and molecular study. Here, we re-evaluate gastropod phylogenetic relationships by collecting new transcriptome data for 40 species and analysing them in combination with publicly available genomes and transcriptomes. Our datasets include all five main gastropod clades: Patellogastropoda, Vetigastropoda, Neritimorpha, Caenogastropoda and Heterobranchia. We use two different methods to assign orthology, subsample each of these matrices into three increasingly dense subsets, and analyse all six of these supermatrices with two different models of molecular evolution. All 12 analyses yield the same unrooted network connecting the five major gastropod lineages. This reduces deep gastropod phylogeny to three alternative rooting hypotheses. These results reject the prevalent hypothesis of gastropod phylogeny, Orthogastropoda. Our dated tree is congruent with a possible end-Permian recovery of some gastropod clades, namely Caenogastropoda and some Heterobranchia subclades.
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Donnarumma, Luigia, Roberto Sandulli, Luca Appolloni, José Sánchez-Lizaso, and Giovanni Russo. "Assessment of Structural and Functional Diversity of Mollusc Assemblages within Vermetid Bioconstructions." Diversity 10, no. 3 (August 28, 2018): 96. http://dx.doi.org/10.3390/d10030096.

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Dendropoma lebeche is a prosobranch gastropod belonging to the family Vermetidae, which calcifies its shell on hard substrates in dense aggregates, forming biogenic constructions along the western Mediterranean intertidal habitat. It is an important ecosystem engineer and, due to its ecological value, is protected by international convention. The aim of this study is to investigate the mollusc composition and diversity occurring within Spanish vermetid bioconstructions. During the late summer 2013, three distant sites along the Mediterranean coast of Spain were sampled by scraping off the vermetid shells to study their associated assemblages. A total of 600 molluscs were identified within the classes of Polyplacophora (four species), Gastropoda (35 spp.) and Bivalvia (18 spp.). Multivariate analyses revealed significant differences in composition and trophic diversity of mollusc assemblages among the three sites, highlighting a clear geographical gradient. Overall, both herbivores (grazers and deposit feeders) and omnivores were the quantitatively dominant trophic groups, while carnivores (predators and ectoparasites) were very scarce. Our results point out that mollusc assemblages associated with vermetid bioconstructions are rich and diversified, both in populations structure and trophic diversity, confirming the important role of vermetid gastropods as ecosystem engineers and biodiversity enhancers in shallow coastal waters.
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HODGSON, A. N. "Paraspermatogenesis in gastropod molluscs." Invertebrate Reproduction & Development 31, no. 1-3 (January 1997): 31–38. http://dx.doi.org/10.1080/07924259.1997.9672560.

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Shepeleva, I. P. "Vitreous body of the camera-like eyes of terrestrial gastropod mollusks (Heterobranchia, Stylommatophora)." Ruthenica, Russian Malacological Journal 31, no. 2 (April 1, 2021): 93–104. http://dx.doi.org/10.35885/ruthenica.2021.31(2).5.

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Using the methods of light and electron microscopy, the morphological properties were studied, and the evolutionary changes in the vitreous body of the camera-like eyes of some species of terrestrial gastropod pulmonate molluscs were traced. It was demonstrated that all the considered properties of the vitreous body of molluscs are typical for terrestrial pulmonates. In the course of evolution, as a result of the land development by mollusks, the properties of their vitreous body have hardly changed.
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Dissertations / Theses on the topic "Gastropod molluscs"

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Colman, J. G. "Studies of the life history biology of deep-sea gastropod molluscs." Thesis, Swansea University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.636280.

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The gametogenic biology, larval development and population structure of a number of deep-sea gastropod species from the Rockall Trough, northeast Atlantic has been examined. The reproductive biology of the neogastropod Colus jeffreysianus is described. This species has a non-planktotrophic mode of development (egg size 170 μm diameter), producing a capsule containing c. 4000-5000 eggs from which only 1 juvenile hatches out, the remainder being utilised as nurse eggs. The capsule wall is a complex structure comprised of 5 layers. Histological examination of gonads of mature individuals from a time series of samples taken at a 2000m permanent station indicates a pattern of continuous production of gametes with no apparent seasonality. Gametogenesis in the archaeogastropod Calliotropis ottoi and in the cephalaspid opisthobranchs Scaphander punctostriatus and Philine quadrata is described, and appears also to be a continuous process. Determination of mode of larval development of 38 species of prosobranch and opisthobranch was made on the basis of protoconch morphology using scanning electron microscopy. Thirteen species have planktotrophic development and 25 have non-planktotrophic development. Descriptions are given of the shells of two previously undescribed archaeogastropod species and of a number of deep-sea prosobranch egg capsules. Shell size-frequency distributions of P. quadrata, S. punctostriatus and Benthonella tenella, the 3 most numerically abundant species from the Rockall Trough, show a trend of decreasing mean size from spring to summer and a peak of newly-settled post-larvae in August, suggesting an annual recruitment of juveniles to the adult population. All 3 species have planktotrophic development. These results are discussed in the light of the hypothesis that the seasonally varying flux of surface-derived organic matter to the deep sea is the selective pressure for reproductive periodicity.
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Tabor, A. M. "The effects of conspecific mucus on the behaviour of some gastropod molluscs." Thesis, University of Manchester, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377724.

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Stuart, Jeffrey Alan. "Evolutionary and adaptive aspects of lipid and ketone body metabolism in gastropod molluscs." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ31903.pdf.

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Morley, Neil Jason. "Toxicity of cadmium and zinc to the digenean parasites of aquatic gastropod molluscs." Thesis, Royal Holloway, University of London, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.394497.

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Mannino, Marcello Antonio. "Marine molluscs and human palaeoecology : a case study of the inter-tidal gastropod Monodonta lineata (Da Costa)." Thesis, University College London (University of London), 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.392287.

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Newcomb, James M. "Homologous Neurons and their Locomotor Functions in Nudibranch Molluscs." Digital Archive @ GSU, 2006. http://digitalarchive.gsu.edu/biology_diss/15.

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These studies compare neurotransmitter localization and the behavioral functions of homologous neurons in nudibranch molluscs to determine the types of changes that might underlie the evolution of species-specific behaviors. Serotonin (5-HT) immunohistochemistry in eleven nudibranch species indicated that certain groups of 5 HT-immunoreactive neurons, such as the Cerebral Serotonergic Posterior (CeSP) cluster, are present in all species. However, the locations and numbers of many other 5 HT-immunoreactive neurons were variable. Thus, particular parts of the serotonergic system have changed during the evolution of nudibranchs. To test whether the functions of homologous neurons are phylogenetically variable, comparisons were made in species with divergent behaviors. In Tritonia diomedea, which crawls and also swims via dorsal-ventral body flexions, the CeSP cluster includes the Dorsal Swim Interneurons (DSIs). It was previously shown that the DSIs are members of the swim central pattern generator (CPG); they are rhythmically active during swimming and, along with their neurotransmitter 5-HT, are necessary and sufficient for swimming. It was also known that the DSIs excite efferent neurons used in crawling. DSI homologues, the CeSP-A neurons, were identified in six species that do not exhibit dorsal-ventral swimming. Many physiological characteristics, including excitation of putative crawling neurons were conserved, but the CeSP A neurons were not rhythmically active in any of the six species. In the lateral flexion swimmer, Melibe leonina, the CeSP-A neurons and 5-HT, were sufficient, but not necessary, for swimming. Thus, homologous neurons, and their neurotransmitter, have functionally diverged in species with different behaviors. Homologous neurons in species with similar behaviors also exhibited functional divergence. Like Melibe, Dendronotus iris is a lateral flexion swimmer. Swim interneuron 1 (Si1) is in the Melibe swim CPG. However, its putative homologue in Dendronotus, the Cerebral Posterior ipsilateral Pedal (CPiP) neuron, was not rhythmically active during swim-like motor patterns, but could initiate such a motor pattern. Together, these studies suggest that neurons have changed their functional relationships to neural circuits during the evolution of species-specific behaviors and have functionally diverged even in species that exhibit similar behaviors.
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Taylor, Anne, and n/a. "Zinc, copper and cadmium accumulation, detoxification and storage in the gastropod molluscs Austrocochlea constricta and Bembicium auratum and an assessment of their potential as biomonitors of trace metal pollution in estuarine environments." University of Canberra. Applied Science, 1998. http://erl.canberra.edu.au./public/adt-AUC20061109.124205.

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Zinc, copper and cadmium accumulation was measured in two herbivorous gastropod molluscs Austrocochlea constricta and Bembicium auratum from Lake Macquarie NSW an area with a history of trace metal pollution. The investigation consisted of three main parts. The first part examined the influence of organism mass and location within the Lake on whole body tissue metal concentrations. This part of the study also compared the distributions of tissue metal concentrations of populations from Lake Macquarie, a known polluted environment, with those of populations from Jervis Bay NSW, an unpolluted environment, to establish whether either species is a net accumulator of zinc copper or cadmium. The second part of the investigation examined a range of factors which may influence whole body metal concentrations. One location in Lake Macquarie was sampled monthly from August 1995 to July 1996. The factors examined were temporal variation, gender, breeding cycle, and tissue distribution. The final part of the investigation examined the detoxification and storage of excess metals in the gastropods from Lake Macquarie. The mechanisms studied were metallothioneins and granules. The tissue metal concentrations of both species were found to be independent of mass. Location within Lake Macquarie did not significantly influence tissue metal concentrations. Variation between individuals was the most significant contribution to overall variation, resulting in a positive skewing of sample trace metal distributions. B. auratum populations from Lake Macquarie had significantly higher copper and cadmium tissue concentrations and A. constricta populations had significantly higher zinc, copper and cadmium tissue concentrations than the populations from Jervis Bay. This suggests that regulation of these metals is not occurring. A. constricta may therefore be considered a net accumulator of zinc, copper and cadmium and B. auratum of copper and cadmium. Tissue metal concentrations did not vary significantly over time. It is suggested that the organisms are in equilibrium with their environment. B. auratum has higher natural equilibrium concentrations than A. constricta particularly for copper and cadmium, suggesting different routes of exposure, uptake or accumulation for the two species. Gender and breeding cycle did not significantly influence tissue metal concentrations. Most of the variability in total copper and cadmium concentrations of both species was explained by variability in gonad tissue metal concentration, while variability in the gonad and somatic tissues zinc concentration explained about an equal amount of the variability in total zinc concentration. A. constricta and B. auratum were both found to induce a cadmium binding protein which has some features in common with metallothionein. A protein of around 10 000 Da which binds approximately 60% of the soluble cadmium was isolated using gel filtration. This protein was further separated into two isoforms using anion exchange. The first isoform eluted at the same time as MT I and the second at the same time as MT II rabbit liver standard. Large cells containing granular material which stained positive for calcium were observed interspersed among the connective tissue immediately behind the columnar epithelial cells lining the gut wall in both species under a light microscope. Calcium positive granular particles were also observed within the columnar epithelial cells of B. auratum. These species have been shown to be net accumulators of the trace metals investigated, with the exception of zinc in B. auratum. It has also been established that organism mass, gender and reproductive state, the partitioning of metals between tissues, and temporal effects are not confounding factors for the purposes of comparing trace metal concentrations between populations. They should therefore be effective biomonitors of the trace metals investigated, with the exception of zinc in B. auratum.
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Castro, Italo Braga de. "Estudo do imposex em muricÃdeos do gÃnero Stramonita (Mollusca: Gastropoda) no Nordeste do Brasil." Universidade Federal do CearÃ, 2005. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=2984.

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O imposex consiste no surgimento de caracteres sexuais masculinos em fÃmeas de moluscos prosobrÃnquios expostos à contaminaÃÃo por compostos orgÃnicos de estanho (COEs). Essa contaminaÃÃo à oriunda de tintas de aÃÃo antiincrustante utilizadas em embarcaÃÃes de todo mundo. Como o imposex leva ao desenvolvimento de caracteres mensurÃveis, o mesmo vem sendo usado como ferramenta de bioindicaÃÃo para esse tipo especÃfico de poluiÃÃo. O presente trabalho teve como objetivo monitorar a contaminaÃÃo por organoestÃnicos ao longo das Ãreas sob a influÃncia dos 10 principais terminais portuÃrios da regiÃo nordeste do Brasil e comparar o desenvolvimento do imposex nas espÃcies de muricÃdeos utilizadas no estudo. Essas espÃcies foram: Stramonita haemastoma e Stramonita rustica. Os Ãndices usados para quantificar o imposex foram o VDSI. o RPSI, o RPLI e a % de imposex. Em todos os terminais portuÃrios estudados observou-se pelo menos uma estaÃÃo onde se detectou a presenÃa do imposex o que sugere fortemente a presenÃa de contaminaÃÃo por COEs. Entretanto os Ãndices observados revelaram-se baixos quando comparados aos Ãndices obtidos em outros monitoramentos realizados em regiÃes muito industrializadas da Europa e da Ãsia. Mesmo quando comparados aos resultados observados na BaÃa de Guanabara no litoral do estado do Rio de Janeiro os Ãndices de imposex no nordeste do Brasil revelam-se pouco elevados. Isso reforÃa dados jà mencionados na literatura que sugerem que a contaminaÃÃo por compostos orgÃnicos de estanho à mais severa em regiÃes mais industrializadas do mundo. Os estudos comparativos quanto ao desenvolvimento do imposex nas espÃcies S. haemastoma a e S. rustica mostraram que a primeira à mais sensÃvel à contaminaÃÃo por COEs uma vez que mesmo quando submetidas experimentalmente a concentraÃÃes iguais e ao mesmo tempo de exposiÃÃo S. haemastoma apresentou uma resposta muito mais severa que sua congÃnere S. rustica. Das 82 estaÃÃes analisadas durante o presente estudo, 32 mostraram-se completamente livres de quaisquer indÃcios de imposex o que sugere que o imposex nÃo se manifesta naturalmente nas referidas espÃcies.
Imposex consists of a superimposition of male sexual characteristics in female prosobranch molluscs exposed to organotin compounds (OCs) contamination. This contamination is caused by biocides present in antifouling paints used on boats all over the world. Since imposex leads to measurable characters, those have been used for biological-effect monitoring of this type of contamination. This present work had the objective to monitor the organotin contamination along the areas under influence of the 10 most important harbours in the northeastern coast of Brazil, and also to compare the imposex development in the muricid species studied. Those species were Stramonita haemastoma and Stramonita rustica. The indices used to quantify the imposex development were VDSI, RPSI, RPLI and the imposex percentage. In all harbour areas, there was at least one site where imposex was detected, what strongly suggests the presence of OCs contamination. However, the indices observed appeared to be lower when compared to the indices of other monitorings in industrialized regions, such as Europe and Asia. When compared to studies in Guanabara Bay â Rio de Janeiro, Brazil, the indices also seemed very low. This reinforces the data already mentioned in other studies, which suggests that the higher the level of industrialization in an area more severe is the contamination by organotin compounds. Comparative studies of imposex development in the species Stramonita haemastoma and S. rustica revealed that the former is more sensitive to OCs contamination, once that, when submitted experimentally to equal concentrations and same exposure time, S. haemastoma presented a much greater response than S. rustica. In this present study, 82 sites were analyzed, 32 appeared to be free from any imposex evidence, what suggests that imposex does not appear as a natural characteristic in those S. haemastoma and S. rustica.
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Tong, Kit-ying Lily. "The population dynamics and feeding ecology of Thais clavigera (Kuster) and Morula musiva (Kiener) (mollusca: gastropoda: muricidae) in Hong Kong /." [Hong Kong] : University of Hong Kong, 1986. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12320882.

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Barroso, Cristiane Xerez. "Anatomia e desenvolvimento intracapsular de niritina zebra (Buguiere, 1792) (Mollusca, Gastropoda, Neritidae)." Universidade Federal do CearÃ, 2009. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=2924.

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Neritina zebra à um gastrÃpode comum em bancos de lama e Ãguas salobras. Este estudo tem como objetivos revisar o conteÃdo da literatura especializada e acrescentar informaÃÃes sobre a anatomia de Neritina zebra. Foram analisados os animais coletados no estuÃrio do rio Cearà - CE, no Parque Estadual do rio Cocà â CE e os espÃcimes tombados na coleÃÃo MalacolÃgica "Prof. Henry Ramos Matthews" (CMPHRM) da Universidade Federal do Cearà (UFC) e na coleÃÃo de Moluscos do Museu de Zoologia da Universidade de SÃo Paulo (MZUSP). A rÃdula foi observada e fotografada atravÃs de microscÃpio Ãptico e microscÃpio eletrÃnico de varredura (MEV). A protoconcha foi observada e fotografada atravÃs do MEV. N. zebra apresenta concha globosa, protoconcha com 1,5 voltas, teleoconcha com 3,5 voltas, lÃbio interno denteado, espira baixa, abertura semilunar. Concha apresentando vÃrias cores e vÃrios padrÃes de âziguezagueâ. A columela forma um septo transversal. O opÃrculo à calcÃrio e liso, com apÃfise bifurcada. O mÃsculo columelar à bem desenvolvido, com duas partes de tamanhos diferentes. BrÃnquia bipectinada. O osfrÃdio encontra-se à frente da membrana suspensÃria da brÃnquia, do lado esquerdo do manto. O coraÃÃo apresenta um Ãtrio e um ventrÃculo. A rÃdula à do tipo rhipidoglossa, apresentando a fÃrmula geral .5.1.5.. EsÃfago e intestino longos. O intestino passa atravÃs da cavidade pericardial, estando envolvido pelo ventrÃculo. O sistema reprodutor masculino apresenta uma abertura genital, ducto espermÃtico longo e enrolado, glÃndula prostÃtica e pÃnis com formato laminar do lado direito da regiÃo cefÃlica. O sistema reprodutor feminino apresenta trÃs poros genitais (um vaginal, um âgonoporo principalâ e um âducto enigmÃticoâ), um saco de reforÃo, saco do espermatÃforo, ovÃrio com vÃrias vilosidades digitiformes paralelas, receptÃculo seminal e glÃndulas de albÃmen e da cÃpsula.
Neritina zebra is a common gastropod on mud bottom and brackish water. This study aims to review the literature and add information about the anatomy of Neritina zebra. We analyzed the animals collected in the estuary of the Cearà river â CE, in âParque Estadual do rio CocÃâ - CE and specimens deposited in âColeÃÃo MalacolÃgica Prof. Henry Ramos Matthews" (CMPHRM) of âUniversidade Federal do CearÃâ (UFC) and âColeÃÃo de Moluscos do Museu de Zoologia da Universidade de SÃo Pauloâ (MZUSP). The radula was observed and photographed through optic and scanning electron microscope (SEM). The protoconch was observed and photographed by SEM. N. zebra presents globose shell, protoconch with 1.5 whorls, teleoconch with 3.5 whorls, small teeth on inner lip, low spire, semilunar aperture. Shells present several different colors and patterns of zigzag. The columella forms a transversal septum. Operculum calcareous, smooth, with bifurcated apophysis. The columellar muscle is well developed, with two parts of different sizes. Bipectinate gill. The osphradium is in front of the suspensory membrane of the gill, on the left side of the mantle. The heart presents one auricle and one ventricle. The radula is rhipidoglossa type, presenting the general formula .5.1.5. . Long esophagus and intestine. The intestine passes through the pericardial cavity, enwrapped by the ventricle. The male reproductive system presents one genital opening, very long and coiled spermatic duct, prostate gland and penis with laminar shape on the right side of the cephalic region. The female reproductive system has three genital pores (vaginal pore, main female gonopore and enigmatic duct), a reinforcement sac, a spermatophore sac, an ovary with many small parallel digitiformes vilosities, a seminal receptacle and the albumen and capsule glands.
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Books on the topic "Gastropod molluscs"

1

Okafor, Fabian C. The varied roles of snails (Gastropod Molluscs) in the dynamics of human existence: An inaugural lecture of the University of Nigeria, delivered on May 28, 2009. [Nsukka, Nigeria]: University of Nigeria, Senate Ceremonials Committee, 2009.

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malacologia, Società italiana di. Catalogo annotato dei molluschi marini del Mediterraneo =: Annotated check-list of Mediterranean marine mollusks. Bolognese: Libreria Naturalistica Bolognese, 1990.

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E, Thompson T., Linnean Society of London, and Estuarine and Brackish-water Sciences Association., eds. Molluscs: Benthic opisthobranchs : Mollusca, Gastropoda : keys and notes for the identification of the species. 2nd ed. Leiden: Published for the Linnean Society of London and the Estuarine & Brackish-water Sciences Association by E.J. Brill/W. Backhuys, 1988.

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Barker, G. M. Naturalised terrestrial Stylommatophora (Mollusca, Gastropoda). Lincoln, Canterbury, N.Z: Manaaki Whenua Press, 1999.

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Falniowski, Andrzej. Przodoskrzelne (Prosobranchia, Gastropoda, Mollusca) Polski. Kraków: Nakł. Uniwersytetu Jagiellońskiego, 1989.

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Lalli, Carol M. Pelagic snails: The biology of holoplanktonic gastropod mollusks. Stanford, Calif: Stanford University Press, 1989.

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Taylor, Dwight W. Fresh-water molluscs from New Mexico and vicinity. Socorro: New Mexico Bureau of Mines & Mineral Resources, 1987.

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Architectonicidae of the Indo-Pacific (Mollusca, Gastropoda). Stuttgart: G. Fischer Verlag, 1993.

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Foster-Smith, Judy. Mollusca: Caudofoveata, Solenogastres, Polyplacophora, Gastropoda, Scaphopoda, Cephalopoda. Cullercoats (Cullercoats, North Shields, Tyne & Wear): Dove Marine Laboratory, 1986.

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Jokinen, Eileen H. The freshwater snails (Mollusca gastropoda) of New York State. Albany, N.Y: New York State Museum, 1992.

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Book chapters on the topic "Gastropod molluscs"

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Castell, Laura. "Gastropod Molluscs." In Aquaculture, 567–82. West Sussex, UK: Blackwell Publishing Ltd., 2013. http://dx.doi.org/10.1002/9781118687932.ch24.

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Coutellec, Marie-Agnès, and Thierry Caquet. "Gastropod Ecophysiological Response to Stress." In Physiology of Molluscs, 303–96. New Jersey : Apple Academic Press, Inc., 2016-: Apple Academic Press, 2021. http://dx.doi.org/10.1201/9781315207124-9.

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Mukai, Spencer T., and Fumihiro Morishita. "Physiological Functions of Gastropod Peptides and Neurotransmitters." In Physiology of Molluscs, 379–476. New Jersey : Apple Academic Press, Inc., 2016-: Apple Academic Press, 2021. http://dx.doi.org/10.1201/9781315207117-10.

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Davies-Coleman, Mike T. "Secondary Metabolites from the Marine Gastropod Molluscs of Antarctica, Southern Africa and South America." In Molluscs, 133–57. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/978-3-540-30880-5_6.

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Nakahara, H. "Nacre Formation in Bivalve and Gastropod Molluscs." In Mechanisms and Phylogeny of Mineralization in Biological Systems, 343–50. Tokyo: Springer Japan, 1991. http://dx.doi.org/10.1007/978-4-431-68132-8_55.

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Arshavsky, Yu I., T. G. Deliagina, I. M. Gelfand, G. N. Orlovsky, Yu V. Panchin, and G. A. Pavlova. "Neuronal Mechanisms Controlling Rhythmic Movements in Gastropod Molluscs." In Stance and Motion, 107–21. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4899-0821-6_10.

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Darias Jerez, José, M. Cueto, and A. R. Díaz-Marrero. "The Chemistry of Marine Pulmonate Gastropods." In Molluscs, 105–31. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/978-3-540-30880-5_5.

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Baur, Bruno, and Anette Baur. "Reproductive Strategies in Stylommatophoran Gastropods." In Physiology of Molluscs, 311–77. New Jersey : Apple Academic Press, Inc., 2016-: Apple Academic Press, 2021. http://dx.doi.org/10.1201/9781315207117-9.

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Olivera, Baldomero M., Alexander Fedosov, Julita S. Imperial, and Yuri Kantor. "Physiology of Envenomation by Conoidean Gastropods." In Physiology of Molluscs, 153–88. New Jersey : Apple Academic Press, Inc., 2016-: Apple Academic Press, 2021. http://dx.doi.org/10.1201/9781315207124-5.

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Ehrlich, Hermann. "Adhesive Gels from Marine Gastropods (Mollusca)." In Biological Materials of Marine Origin, 335–40. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-9130-7_22.

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Conference papers on the topic "Gastropod molluscs"

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Ramírez, R., C. Collado, O. Bergasa, J. J. Hernández, and M. D. Gelado. "Gastropod molluscs as indicators of the cadmium natural inputs in the Canarian Archipelago (Eastern Atlantic Ocean)." In ENVIRONMENTAL TOXICOLOGY 2006. Southampton, UK: WIT Press, 2006. http://dx.doi.org/10.2495/etox060201.

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Conti, M. E., M. Iacobucci, M. Mecozzi, and G. Cecchetti. "Trace metals in soft tissues of two marine gastropod molluscs: Monodonta turbinata B. and Patella caerulea L. collected in a marine reference ecosystem." In COASTAL ENVIRONMENT 2006. Southampton, UK: WIT Press, 2006. http://dx.doi.org/10.2495/cenv060011.

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Yudha, Donan Satria, and Rusyad Adi Suriyanto. "Marine-mollusc fossils (Mollusca: Bivalvia and Gastropoda) and their paleoenvironmental interpretation from the Situs manusia purba Sangiran area." In TOWARDS THE SUSTAINABLE USE OF BIODIVERSITY IN A CHANGING ENVIRONMENT: FROM BASIC TO APPLIED RESEARCH: Proceeding of the 4th International Conference on Biological Science. Author(s), 2016. http://dx.doi.org/10.1063/1.4953486.

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Tennakoon, Shamindri, Roger W. Portell, Roger W. Portell, Roger W. Portell, Michał Kowalewski, Michał Kowalewski, Michał Kowalewski, et al. "MORPHOMETRIC ANALYSIS OF CENOZOIC CASSIDS (MOLLUSCA: GASTROPODA)." In GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-323424.

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Camargo, Paulo Ricardo Da Silva, Luis Felipe Godinho Barreiros, Newton Pimentel Ulhôa Barbosa, Antônio Valadão Cardoso, and Afonso Pelli. "ESTADO ATUAL DE CONHECIMENTO DAS PRINCIPAIS CARACTERÍSTICAS DOS MOLUSCOS." In I Congresso Brasileiro de Biodiversidade Virtual. Revista Multidisciplinar de Educação e Meio Ambiente, 2021. http://dx.doi.org/10.51189/rema/1082.

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INTRODUÇÃO: O Filo Mollusca (do latim, molluscus = mole) é unanimemente aceito como um grupo monofilético. Esse grupo é segundo maior Filo do Reino Animal, com uma estimativa de 240.000 espécies, atrás apenas do Filo Arthropoda. Os moluscos apresentam uma enorme diversidade biológica, com distintos nichos e interações ecológicas. Esses fatores podem estar atrelados a ampla distribuição geográfica. Adicionalmente a isso, algumas espécies são de interesses econômicos e outras de saúde pública. OBJETIVO: O presente trabalho teve como objetivo realizar uma revisão bibliográfica das características gerais do grupo, bem como das Classes que compõem o Filo. MATERIAIS E MÉTODOS: A metodologia utilizada foi baseada em revisão bibliográfica utilizando as bases de dados eletrônicos como Scielo, PubMed, Google, Google acadêmico e Periódico Capes. Para a busca do referencial teórico, utilizou-se o descritor em português e inglês “moluscos” combinante com os descritores “classes,“origem” e “filogenia”, utilizando o operador booleano AND. Foram selecionados para leitura 60 trabalhos (artigos e capítulos de livros) no período de dezembro de 2020 a março de 2021. Não foram considerados artigos relacionados a coleções zoológicas, sendo preferidos aqueles artigos que apresentavam características gerais do grupo em pauta. RESULTADOS: O Filo Mollusca está distribuído em oito classes, Solenogastres ou Neomeniomorpha; Caudofoveata ou Chaetodermomorpha; Polyplacophora; Bivalvia, Monoplacophora; Scaphopoda; Gastropoda e Cephalopoda. CONCLUSÃO: Em síntese, ficou evidenciado uma expressiva escassez de trabalhos em várias áreas, como biologia; história de vida; hábitos alimentares; morfologia; biogeografia; sistemática e filogenia; genética e em outras diversas áreas da zoologia. Apesar da elevada e significativa importância como fragmentadores nos ecossistemas, exercendo a ciclagem dos nutrientes e sustentando os níveis de produção primária e secundária conhecidos, são ainda negligenciados. Esse fato pode ter relação com as limitações e dificuldades da amostragem, identificação e manutenção de equipe técnica com elevado custo. Além disso, alguns grupos ocorrem somente em águas profundas e existem poucas linhas de pesquisa nas instituições acadêmicas.
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Tennakoon, Shamindri D., Roger W. Portell, Roger W. Portell, Roger W. Portell, Michał Kowalewski, Michał Kowalewski, Michał Kowalewski, et al. "CARNIVOROUS CASSIDS (MOLLUSCA: GASTROPODA) FROM THE UPPER EOCENE OCALA LIMESTONE OF FLORIDA." In 67th Annual Southeastern GSA Section Meeting - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018se-313097.

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Kuzmenkin, D. V. "MORPHOLOGY OF THE RADULA OF SOME SIBERIAN REPRESENTATIVES OF THE BITHYNIIDAE FAMILY (MOLLUSCA: GASTROPODA)." In V International Scientific Conference CONCEPTUAL AND APPLIED ASPECTS OF INVERTEBRATE SCIENTIFIC RESEARCH AND BIOLOGICAL EDUCATION. Tomsk State University Press, 2020. http://dx.doi.org/10.17223/978-5-94621-931-0-2020-21.

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Light microscopy was used to study the morphology of the radula of four nominal species of the Bithyniidae family living in Siberia: Boreoelona contortrix, B. sibirica, Opisthorchophorus baudonianus, O. troschelii. A significant difference in the structure of radula B. contortrix from the other three species is noted.
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Epa, Yuwan Ranjeev, Alycia L. Stigall, and Nancy J. Stevens. "PALEOECOLOGY OF THE LATE OLIGOCENE LANISTES ( MOLLUSCA: GASTROPODA) FROM THE RUKWA RIFT BASIN, TANZANIA." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-282973.

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Groves, Lindsey T., and Bernard M. Landau. "NEOGENE PALEONTOLOGY IN THE NORTHERN DOMINICAN REPUBLIC. THE SUPERFAMILY CYPRAEOIDEA (MOLLUSCA: GASTROPODA: FAMILIES: CYPRAEIDAE, OVULIDAE, TRIVIIDAE, AND ERATOIDAE)." In 116th Annual GSA Cordilleran Section Meeting - 2020. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020cd-345941.

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"Morphological Description and Genetic Sequencing of Mitochondrial COI Gene in Iraqi New Record Limax flavus (L., 1758) (Mollusca: Gastropoda)." In Aug. 5-7, 2019 Milan (Italy). Eminent Association of Pioneers, 2019. http://dx.doi.org/10.17758/eares7.c0819228.

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