Academic literature on the topic 'Marsupial moles'
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Journal articles on the topic "Marsupial moles"
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Archer, Michael, Robin Beck, Miranda Gott, Suzanne Hand, Henk Godthelp, and Karen Black. "Australia's first fossil marsupial mole (Notoryctemorphia) resolves controversies about their evolution and palaeoenvironmental origins." Proceedings of the Royal Society B: Biological Sciences 278, no. 1711 (November 3, 2010): 1498–506. http://dx.doi.org/10.1098/rspb.2010.1943.
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Fossils of a marsupial mole (Marsupialia, Notoryctemorphia, Notoryctidae) are described from early Miocene deposits in the Riversleigh World Heritage Area, northwestern Queensland, Australia. These represent the first unequivocal fossil record of the order Notoryctemorphia, the two living species of which are among the world's most specialized and bizarre mammals, but which are also convergent on certain fossorial placental mammals (most notably chrysochlorid golden moles). The fossil remains are genuinely ‘transitional', documenting an intermediate stage in the acquisition of a number of specializations and showing that one of these—the dental morphology known as zalambdodonty—was acquired via a different evolutionary pathway than in placentals. They, thus, document a clear case of evolutionary convergence (rather than parallelism) between only distantly related and geographically isolated mammalian lineages—marsupial moles on the island continent of Australia and placental moles on most other, at least intermittently connected continents. In contrast to earlier presumptions about a relationship between the highly specialized body form of the blind, earless, burrowing marsupial moles and desert habitats, it is now clear that archaic burrowing marsupial moles were adapted to and probably originated in wet forest palaeoenvironments, preadapting them to movement through drier soils in the xeric environments of Australia that developed during the Neogene.
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Denyer, Alice L., Sophie Regnault, and John R. Hutchinson. "Evolution of the patella and patelloid in marsupial mammals." PeerJ 8 (August 19, 2020): e9760. http://dx.doi.org/10.7717/peerj.9760.
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The musculoskeletal system of marsupial mammals has numerous unusual features beyond the pouch and epipubic bones. One example is the widespread absence or reduction (to a fibrous “patelloid”) of the patella (“kneecap”) sesamoid bone, but prior studies with coarse sampling indicated complex patterns of evolution of this absence or reduction. Here, we conducted an in-depth investigation into the form of the patella of extant marsupial species and used the assembled dataset to reconstruct the likely pattern of evolution of the marsupial patella. Critical assessment of the available literature was followed by examination and imaging of museum specimens, as well as CT scanning and histological examination of dissected wet specimens. Our results, from sampling about 19% of extant marsupial species-level diversity, include new images and descriptions of the fibrocartilaginous patelloid in Thylacinus cynocephalus (the thylacine or “marsupial wolf”) and other marsupials as well as the ossified patella in Notoryctes ‘marsupial moles’, Caenolestes shrew opossums, bandicoots and bilbies. We found novel evidence of an ossified patella in one specimen of Macropus rufogriseus (Bennett’s wallaby), with hints of similar variation in other species. It remains uncertain whether such ossifications are ontogenetic variation, unusual individual variation, pathological or otherwise, but future studies must continue to be conscious of variation in metatherian patellar sesamoid morphology. Our evolutionary reconstructions using our assembled data vary, too, depending on the reconstruction algorithm used. A maximum likelihood algorithm favours ancestral fibrocartilaginous “patelloid” for crown clade Marsupialia and independent origins of ossified patellae in extinct sparassodonts, peramelids, notoryctids and caenolestids. A maximum parsimony algorithm favours ancestral ossified patella for the clade [Marsupialia + sparassodonts] and subsequent reductions into fibrocartilage in didelphids, dasyuromorphs and diprotodonts; but this result changed to agree more with the maximum likelihood results if the character state reconstructions were ordered. Thus, there is substantial homoplasy in marsupial patellae regardless of the evolutionary algorithm adopted. We contend that the most plausible inference, however, is that metatherians independently ossified their patellae at least three times in their evolution. Furthermore, the variability of the patellar state we observed, even within single species (e.g. M. rufogriseus), is fascinating and warrants further investigation, especially as it hints at developmental plasticity that might have been harnessed in marsupial evolution to drive the complex patterns inferred here.
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Pearson, D., and J. Turner. "Marsupial Moles pop up in the great Victorian and Gibson Deserts." Australian Mammalogy 22, no. 2 (2000): 115. http://dx.doi.org/10.1071/am00115.
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MARSUPIAL moles (Notoryctes spp.) remain one of the great enigmas of the Australian fauna. Their occurrence is highly sporadic, resulting in a slow trickle of specimens to Museums at the rate of around 5-15 per decade (Johnson 1995). Their small size, cryptic habits, remote distribution and wariness have led to few reported sightings. In addition, the difficulty of keeping captive Notoryctes has restricted the collection of basic biological information (Howe 1975; Corbett 1975; Johnson and Walton 1989).
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Bennison, Kerrie, Jim Clayton, Robert Godfree, Chris Pavey, and Melinda Wilson. "Surfacing behaviour and ecology of the marsupial mole (Notoryctes typhlops) at Uluru-Kata Tjuta National Park." Australian Mammalogy 36, no. 2 (2014): 184. http://dx.doi.org/10.1071/am13015.
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Little is known about the distribution and ecology of the cryptic and unique marsupial mole. In this paper we report on the habitat preferences and surfacing behaviour of marsupial moles on the basis of surface sign surveys conducted in Uluru-Kata Tjuta National Park and Ayers Rock Resort over a 12-month period by Uluru-Kata Tjuta National Park staff and traditional owners. A key aim of the study was to assess the potential viability of using surface sign as a rapid, non-intrusive alternative to traditional survey methods. We found that surfacing occurred widely across the study area, but that it was highly variable both across survey sites and over time. Significant relationships existed between surface sign counts and environmental variables, including fire age, timing of significant rainfall events, presence of infrastructure and the cumulative rainfall received in the preceding three months. We concluded that the use of marsupial mole surface sign is likely to be a useful method for monitoring the distribution, abundance and habitat requirements of this cryptic species.
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Wright, Jonathan C., and Anne Yoshizawa. "Ionic Composition and Ion Provisioning in Marsupial Fluid of Terrestrial Isopods (Isopoda, Oniscidea)." Crustaceana 84, no. 11 (2011): 1307–24. http://dx.doi.org/10.1163/156854011x594803.
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AbstractThe marsupium of the primarily terrestrial isopod sub-order Oniscidea is modified from the basal marine design and represents one of the key evolutionary innovations enabling the invasion of land habitats. In the Ligiidae, the marsupial chamber is provisioned with water from the external environment via a capillary channel formed from the apposed 6th and 7th pereiopods. The other oniscidean families possess a 'closed' marsupium, isolated from the pleural water-conducting system and provisioned with water and ions by sternal cotyledons. How these different modes of fluid provisioning influence the ionic composition of marsupial fluid and its osmotic and ionic relationship to the haemolymph remains essentially unstudied. We analysed the ionic composition (Na+, K+, Ca2+, Cl–, pH) of marsupial fluid and haemolymph in 4 species of Oniscidea: Ligia occidentalis (Ligiidae), Ligidium lapetum (Ligiidae), Alloniscus perconvexus (Alloniscidae), and Armadillidium vulgare (Armadillidiidae). In all four species, ion concentrations show a broad similarity between marsupial fluid and haemolymph, but with elevated potassium concentrations in the 'closed'-marsupium species. The sternal integument of Armadillidium vulgare is permeable to inulin and the volume of the combined marsupial fluid and haemolymph is not significantly enlarged compared to the haemolymph of non-gravid females. Accordingly, the 'closed' marsupium of A. vulgare can be viewed as a functional subdivision of the haemolymph space. In Ligidium lapetum, marsupial water is derived from external freshwater sources, but marsupial fluid [Na+] and [Cl–]are actually significantly higher than haemolymph values. This species thus possesses an effective means of ion provisioning, paralleling that seen in the 'closed' marsupial species.
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McKenzie, LM, and DW Cooper. "Low MHC class II variability in a marsupial." Reproduction, Fertility and Development 6, no. 6 (1994): 721. http://dx.doi.org/10.1071/rd9940721.
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The major histocompatibility complex (MHC) loci have been shown to be highly polymorphic in most eutherian ('placental') species studied. Several hypotheses have been advanced for the maintenance of this exceptional level of genetic variation, one of which suggests that it is necessary for successful eutherian reproduction. Marsupials (metatherians) and eutherians are the only two groups of viviparous mammals, but their modes of reproduction are quite distinct. Although marsupials have placentae, they are generally shorter lived and less invasive than in eutherians. Other investigations have shown that genetic variation at marsupial MHC class I loci is probably high. Weak or non-existent mixed lymphocyte culture responses previously reported in several marsupial species have suggested a lack of class II variation. Data have therefore been collected on the level of restriction fragment length polymorphism at MHC class II beta-chain encoding loci of a marsupial, Macropus eugenii (the tammar wallaby). This level is shown to be low, between the level of MHC variation found in cheetahs and a population of lions with a restricted genetic base. Attention is drawn to the need to collect more data on the level of class II variability in both eutherians and marsupials, and to the potential of marsupials for understanding the relation, if any, between mode of reproduction and MHC variability.
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Kirsch, JAW, C. Krajewski, MS Springer, and M. Archer. "Dna-Dna Hybridization Studies of Carnivorous Marsupials .2. Relationships Among Dasyurids (Marsupialia, Dasyuridae)." Australian Journal of Zoology 38, no. 6 (1990): 673. http://dx.doi.org/10.1071/zo9900673.
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A suite of comparisons among ten radiolabelled dasyurid species and one outgroup bandicoot was generated using the hydroxyapatite chromatography method of DNA-DNA hybridisation; comparisons were also made with four other dasyurid taxa. Square matrices of DELTA-T(m)s, DELTA-Modes, and DELTA-T50H's were complied and corrected for reciprocity, additivity, and, in the case of DELTA-T(m)'s, normalised percentages of hybridisation. These matrices were analysed using the FITCH algorithm in Felsenstein's PHYLIP (Version 3.1), and all distinct topologies were jackknifed to test for internal consistency. Additionally, uncorrected DELTA-T(m), DELTA-Mode, and DELTA-T50H datasets were bootstrapped and subjected to phylogenetic analysis to assess measurement imprecision. FITCH trees from folded matrices including unlabelled species or those for which heteroduplex comparisons were incomplete were also calculated and jack-knifed, both before and after correction. With the exception of limited measurements to Dasyuroides byrnei and Dasykaluta rosamondae, which showed affinities with Dasyurus spp., the final tree was fully resolved: Sminthopsis crassicaudata and S. murina, together with the more distant Planigale maculata, are the sister-group to all other dasyurids examined, which in turn comprise two clades. One of these includes Dasyurus, Dasyuroides, and Dasykaluta; the other, 'true' Antechinus (A. flavipes, A. stuartii, A. swainsonii) as a sister-group to Antechinus melanurus plus Murexia longicaudata, with Phascogale tapoatafa representing a probable sister-group to all Antechinus with Murexia. DNA-DNA hybridisation provides no support for the genus Satanellus: most of the trees linked Dasyurus albopunctatus with D. maculatus instead of D. hallucatus. Similarly, Antechinus flavipes and A. stuartii appear to be closer to each other than either is to A. swainsonii. The historical biogeographic significance of the adopted phylogeny is considered, and it is concluded that the putative early Miocene separation of Australia and New Guinea was probably too early to account for the independent evolution of the New Guinean clade.
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Warne, Robin W., and Alessandro Catenazzi. "Pouch brooding marsupial frogs transfer nutrients to developing embryos." Biology Letters 12, no. 10 (October 2016): 20160673. http://dx.doi.org/10.1098/rsbl.2016.0673.
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Marsupial frogs have a unique reproductive mode in which females carry eggs enclosed in a sealed dorsal brood pouch. While most anurans are considered to be oviparous with lecithotrophic eggs, the extensively vascularized membrane of the brood pouch in marsupial frogs suggests potential opportunities for nutrient transfer. We tested for matrotrophy in the live-bearing Gastrotheca excubitor (Hemiphractidae), through feeding insects labelled with a 13 C-fatty acid and a 15 N-amino acid to brooding marsupial frogs. We observed significant increases of δ 13 C and δ 15 N in both maternal pouch tissues and embryos, suggesting nutrient transfer. Embryo dry mass also increased with developmental stage, providing further direct evidence for matrotrophy. These results suggest that in addition to gas exchange, the vascularized brood pouch membrane of G. excubitor also enables maternal nutrient transfer. This finding revealed a suspected but untested trait in the evolution of parental care in marsupial frogs, in contrast to previous work on Gastrotheca species that release tadpoles, and suggests greater complexity in reproductive and provisioning modes than previously thought.
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Kolb, Christian, Torsten M. Scheyer, Kristof Veitschegger, Analia M. Forasiepi, Eli Amson, Alexandra A. E. Van der Geer, Lars W. Van den Hoek Ostende, Shoji Hayashi, and Marcelo R. Sánchez-Villagra. "Mammalian bone palaeohistology: a survey and new data with emphasis on island forms." PeerJ 3 (October 22, 2015): e1358. http://dx.doi.org/10.7717/peerj.1358.
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The interest in mammalian palaeohistology has increased dramatically in the last two decades. Starting in 1849 via descriptive approaches, it has been demonstrated that bone tissue and vascularisation types correlate with several biological variables such as ontogenetic stage, growth rate, and ecology. Mammalian bone displays a large variety of bone tissues and vascularisation patterns reaching from lamellar or parallel-fibred to fibrolamellar or woven-fibred bone, depending on taxon and individual age. Here we systematically review the knowledge and methods on cynodont and mammalian bone microstructure as well as palaeohistology and discuss potential future research fields and techniques. We present new data on the bone microstructure of two extant marsupial species and of several extinct continental and island placental mammals. Extant marsupials display mainly parallel-fibred primary bone with radial and oblique but mainly longitudinal vascular canals. Three juvenile specimens of the dwarf island hippopotamidHippopotamus minorfrom the Late Pleistocene of Cyprus show reticular to plexiform fibrolamellar bone. The island muridMikrotia magnafrom the Late Miocene of Gargano, Italy displays parallel-fibred primary bone with reticular vascularisation and strong remodelling in the middle part of the cortex.Leithiasp., the dormouse from the Pleistocene of Sicily, is characterised by a primary bone cortex consisting of lamellar bone and a high amount of compact coarse cancellous bone. The bone cortex of the fossil continental lagomorphProlagus oeningensisand three fossil species of insularProlagusdisplays mainly parallel-fibred primary bone and reticular, radial as well as longitudinal vascularisation. Typical for large mammals, secondary bone in the giant rhinocerotoidParaceratheriumsp. from the Late Oligocene of Turkey is represented by dense Haversian bone. The skeletochronological features ofSinomegaceros yabei, a large-sized deer from the Pleistocene of Japan closely related toMegaloceros, indicate a high growth rate. These examples and the synthesis of existing data show the potential of bone microstructure to reveal essential information on life history evolution. The bone tissue and the skeletochronological data of the sampled island species suggest the presence of various modes of bone histological modification and mammalian life history evolution on islands to depend on factors of island evolution such as island size, distance from mainland, climate, phylogeny, and time of evolution.
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Chilton, N. B., F. Huby-Chilton, A. Koehler, R. B. Gasser, and I. Beveridge. "Phylogenetic relationships of three tribes of cloacinine nematodes (Strongylida: Chabertiidae) from macropodid marsupials." Journal of Helminthology 93, no. 04 (April 19, 2018): 486–93. http://dx.doi.org/10.1017/s0022149x1800038x.
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AbstractThe phylogenetic relationships of 42 species of cloacinine nematodes belonging to three tribes (Coronostrongylinea, Macropostrongylinea and Zoniolaiminea) were examined based on sequence data of the first and second internal transcribed spacers (ITS-1 and ITS-2) of the nuclear ribosomal DNA. All nematodes examined are parasites of Australian macropodid marsupials. None of the three nematode tribes was monophyletic. Paraphyly was also encountered in three genera: Papillostrongylus, Monilonema and Wallabinema. Species within the genus Thallostonema were limited to a single host genus (i.e. Thylogale), whereas species within the five principal genera (Coronostrongylus, Macropostrongylus, Popovastrongylus, Wallabinema and Zoniolaimus) were found to occur in multiple host genera. Potential modes of evolution among these nematodes are discussed.
Dissertations / Theses on the topic "Marsupial moles"
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Warburton, Natalie Marina. "Functional morphology and evolution of marsupial moles (Marsupialia, Notoryctemorphia)." University of Western Australia. School of Animal Biology, 2003. http://theses.library.uwa.edu.au/adt-WU2004.0038.
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Marsupial moles (genus Notoryctes) are the most highly specialised burrowing marsupials. The specialisations of the appendicular musculo-skeletal system of the marsupial moles are extensive and widespread; the major alterations are concentrated in, but not restricted to, the forelimb. Many of the derived features of the muscular system appear to be adaptations for improving the mechanical advantage of the limbs for burrowing. A number of the specialisations of the muscular system of the marsupial moles are convergent with those previously documented in other fossorial mammals, including golden moles, rodents and armadillos. There are, however, a number of unique specialisations of the musculo-skeletal system of Notoryctes. The functional morphology of the locomotor apparatus of marsupial moles is interpreted on the basis of the descriptions of the anatomy of the skeletal and muscular systems. The burrowing technique of the marsupial moles is a modified form of the parasagittal digging method that is used by other fossorial mammals, such as golden moles, armadillos and some rodents including pocket gophers. Differences in the functional morphology of the hindlimb between marsupial moles and other fossorial mammals are a reflection of the fact that marsupial moles do not construct permanent open burrow systems, but instead constantly dig through loose soil, backfilling as they progress. The functional morphology of the tail is uniquely specialised in the marsupial moles to function as the fifth limb during the pentapedal burrowing locomotion of marsupial moles. The remains of Miocene fossil marsupial mole, while clearly pleisiomorphic with respect to the appendicular skeletal morphology of modern notoryctids, demonstrate a high degree of specialisation for digging. It is hypothesised that the Miocene marsupial mole was already substantially specialised for a fossorial lifestyle, and thus pre-adapted for a subterranean lifestyle developed in correlation with the desertification of the Australian continent. Phylogenetic affinities of marsupial moles within the Marsupialia have long been enigmatic. While specialisation of the musculo-skeletal system have been so widespread as to obscure almost any phylogenetically relevant patterns, there is some evidence to support an association between notoryctids and peramelid bandicoots. Interspecific differences between the two species of marsupial moles, Notoryctes typhlops and N. caurinus, are minor but do support the separation of the two species.
Books on the topic "Marsupial moles"
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Nagorsen, David W. Opossums, shrews, and moles of British Columbia. Vancouver: UBC Press, 1996.
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Nagorsen, D. W. Opossums, shrews and moles of British Columbia. Vancouver: UBC Press, 1996.
Find full textBook chapters on the topic "Marsupial moles"
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Fernández, Miriam, Antonio Brante, and Simone Baldanzi. "Costs and Benefits of Brooding among Decapod Crustaceans: The Challenges of Incubating in Aquatic Systems." In Reproductive Biology, 86–114. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780190688554.003.0004.
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This chapter discusses general patterns of brooding in decapod crustaceans from aquatic to terrestrial environments, addressing behavioral adaptations as well as costs and benefits. Brooding embryos is a common feature among decapods. However, brooding exhibits a wide range of modes that are highly dependent on the environment. Brooding is less common in marine systems, whereas there is a general pattern of extended brooding with terrestrialization. Exceptions are crabs that have invaded land directly via the seashore, i.e. land crabs that have indirect development like their marine ancestors. During terrestrialization, adaption to environmental stressors like desiccation, UV radiation, temperature variability, mechanical support, and osmolality seemed to generally favor decreasing larval development and increasing duration of brood care. Thus, crustaceans developed more complex brooding mechanisms as adaptive responses to the colonization of land (e.g., osmoregulation of the maternal fluids, marsupial fluid, sealed and specialized marsupium, provision of nutritious material, grooming and cleaning, ventilation of the embryo masses). However, clear brooding behaviors are also observed among several marine species (e.g. grooming and cleaning, oxygen provision). The major efforts to characterize general brooding patterns among decapod crustaceans and describe brooding behaviors were not accompanied by comprehensive studies to understand the costs and the benefits of brooding. Several studies have addressed the positive influence of the mother on embryo development, but the efforts to quantify the impact on embryo survival are still limited. This chapter identifies problems that need further consideration to reach a deeper understanding of the evolution of brooding in decapod crustaceans.