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Готові списки джерел за темами / Corynexochida

Добірка наукової літератури з теми "Corynexochida"

Автор: Grafiati

Опубліковано: 26 липня 2024

Оновлено: 27 липня 2024

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Статті в журналах з теми "Corynexochida"

1

Geyer, Gerd. "Cambrian corynexochid trilobites from Morocco." Journal of Paleontology 68, no. 6 (November 1994): 1306–20. http://dx.doi.org/10.1017/s0022336000034296.

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Анотація:

Corynexochid trilobites of the Cambrian of Morocco are described and the subfamily Acontheinae is revised. With Kootenia beethoveni n. sp., Kootenia spp. indet., Strettonia sp. A, Clavigellus annulus n. gen. and sp., and gen. et sp. incert., the Moroccan Corynexochida comprise only a few forms that are almost exclusively restricted to the High Atlas Mountains. Biogeographical relationships are weak; strong relationships may exist with the faunas of the Shropshire area as already exemplified by some eodiscid and ellipsocephalid taxa.

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2

Holloway, David J. "Middle Silurian trilobites from Arkansas and Oklahoma, USA. Order Corynexochida." Palaeontographica Abteilung A 319, no. 1-6 (August 27, 2021): 1–55. http://dx.doi.org/10.1127/pala/2021/0101.

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3

Sundberg, Frederick A. "Phylogenetic Analysis of the Spiny Oryctocephalids (Trilobita, Corynexochida?, Oryctocephalidae), Cambrian." Journal of Paleontology 88, no. 3 (May 2014): 556–87. http://dx.doi.org/10.1666/12-130.

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Анотація:

Phylogenetic analyses of the Cambrian spiny oryctocephalids support the elevation to familiar rank of Oryctocephalidae Beecher, 1897 and indicate that the family can be divided into two clades, here designated as the subfamilies Oryctocephalinae Beecher, 1897 and Lancastriinae Kobayashi, 1935. Curvoryctocephaliinae Zhao and YuaninYuan et al., 2002 is considered here a junior synonym of Lancastriinae. Oryctocephalinae have tapered or parallel sided glabella and is composed of species ofOryctocephalusWalcott, 1886. The subgeneraOryctocephalus(Oryctocephalus) andO. (Eoryctocephalus) Zhao and YuaninYuan et al., 2002 do not form separate clades and are here rejected.The genera of the Lancastriinae have expanding glabellae. The subfamily is composed of a broad variety of genera that can be divided into three major subclades:Lancastria,Protoryctocephalus, andOryctocephalites. TheLancastriasubclade is composed ofLancastriaKobayashi, 1935,ChangaspisLeeinChien, 1961, andGoldfieldiaPalmer, 1964 occurring at the base of the Lancastriinae.GoldfieldiaandLancastriaform a sister group toChangaspis. The long branches in the phylograms indicated significant differences between these taxa; thus, the genusGoldfieldiais maintained. TheProtoryctocephalussubclade is monogeneric and forms a sister group to theOryctocephalitessubclade. TheOryctocephalitessubclade consists of several species of this genus and the more derived formsMetabalangiaQian and YuaninZhang et al., 1980 andTonkinellaMansuy, 1916.OryctocephaloidesYuaninZhang et al., 1980 is considered a junior synonym ofOryctocephalitesResser, 1939. The subgeneraOryctocephalites(Oryctocephalites) andO. (Parachangaspis) Zhao and YuaninYuan et al., 2002 do not form separate clades. The later subgenus occurs in the basal portion of theOryctocephalitessubclade indicating that it is a paraphyletic taxon.OpsiosoryctocephalusSundberg, 1994,OryctocephalopsLermontova, 1940, andCurvoryctocephalusZhao and YuaninYuan et al., 2002 are not consistent in their placement within the phylogenetic analyses, although they always occur in the Lancastriinae. As a result they are not placed within a subclade within Lancastriinae.The type speciesGoldfieldia pacificaPalmer, 1964 was based solely on cranidia. This species is redescribed using topotype material that includes cranidia, librigenae, hypostomes, thorax, and pygidia.

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4

Lee, Dong-Chan, and Brian DE Chatterton. "Protaspides of uppermost Cambrian trilobite Missisquoia, with implications for suprafamilial level classification of the genus." Canadian Journal of Earth Sciences 44, no. 4 (April 1, 2007): 493–506. http://dx.doi.org/10.1139/e06-113.

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The protaspides of Missisquoia depressa (Missisquoiidae, Trilobita), from the uppermost Cambrian part of the Rabbitkettle Formation, Mackenzie Mountains, northwestern Canada, are described. Three metaprotaspid stages are recognized, using size as well as features of the anterior border of the cranidium and the shape of the glabella. The morphology of the protaspides is not typical of the Order Corynexochida, suggesting that Missisquoia is not a member of the order to which the genus has been previously assigned. This further indicates that its affinity to the stratigraphically younger styginids and illaenids is questionable.

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5

Basse, Martin. "Middle Devonian trilobites of the Rhenohercynian: I. Corynexochida and Proetida (1)." Palaeontographica Abteilung A 239, no. 4-6 (July 5, 1996): 89–182. http://dx.doi.org/10.1127/pala/239/1996/89.

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6

Lee, Dong-Chan, and Brian D. E. Chatterton. "Protaspides of Leiostegium and their implications for membership of the order Corynexochida." Palaeontology 46, no. 3 (May 2003): 431–45. http://dx.doi.org/10.1111/1475-4983.00306.

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7

Sundberg, Frederick A. "Corynexochida and Ptychopariida (Trilobita, Arthropoda) of the Ehmaniella Biozone (Middle Cambrian), Utah and Nevada." Contributions in science 446 (August 12, 1994): 1–137. http://dx.doi.org/10.5962/p.208082.

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8

Sundberg, Frederick A., and Linda B. Mccollum. "Oryctocephalids (Corynexochida: Trilobita) of the Lower-Middle Cambrian boundary interval from California and Nevada." Journal of Paleontology 71, no. 6 (November 1997): 1065–90. http://dx.doi.org/10.1017/s0022336000036040.

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Анотація:

Seven species of oryctocephalids occur in the Lower to Middle Cambrian boundary strata of the southern Great Basin. These include Oryctocephalites palmeri n. sp. and an Oryctocephalinae species from the uppermost Lower Cambrian (upper Olenellus Biozone); Oryctocephalus indicus (Reed, 1910), Microryctocara nevadensis n. gen. and n. sp., and Oryctocephalites rasettii n. sp. near the base of the Middle Cambrian (lower Plagiura Biozone); and Oryctocephalus primus Walcott, 1886, and Oryctocephalus nyensis Palmer, 1979, from slightly higher strata (upper Plagiura Biozone). Oryctocephalus and Oryctocephalites are emended based on a cladistic analysis of Oryctocephalinae Beecher, 1897.

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9

Lei, Qianping. "New ontogenetic information onDuyunaspis duyunensisZhang & QianinZhouet al., 1977 (Trilobita, Corynexochida) from the Cambrian and its possible sexual dimorphism." Alcheringa: An Australasian Journal of Palaeontology 40, no. 1 (September 16, 2015): 12–23. http://dx.doi.org/10.1080/03115518.2015.1069485.

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10

Fortey, Richard A. "Trilobite systematics: The last 75 years." Journal of Paleontology 75, no. 6 (November 2001): 1141–51. http://dx.doi.org/10.1017/s0022336000017194.

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Анотація:

The progress achieved in trilobite systematics over the last 75 years is briefly reviewed. Different approaches to phylogenetics have influenced the way trilobites have been classified. Classical evolutionary taxonomy, the stratigraphical approach, and cladistics have all contributed in different ways to the current classification, which has evolved piecemeal, and is still unsatisfactory is some ways. Nonetheless, progress towards a phylogenetic classification has been made, especially as the result of information from ontogenies provided by well-preserved silificified material. Trilobites are a well-defined clade within a larger arachnomorph group. Agnostida have been excluded from Trilobita, but are perhaps best considered as specialised trilobites, at least until limbs of eodiscids are described. The outstanding problems in classification of each trilobite order are reviewed. Most are concerned with the recognition of the appropriate Cambrian sister taxa, and the discovery of the relevant ontogenies. It is very likely that post-Cambrian clades “root” deeply into the Cambrian. The coherence, or otherwise, of Proetida, Asaphida, Corynexochida and the lichid/odontopleurid groups will be resolved by such studies. The problems of paraphyly in Ptychopariida and Redlichiina may prove more obdurate. The temporal brevity of certain Cambrian family ranges may be partly a taxonomic artefact. The possibility of a late Cambrian gap in the record on some clades should be considered.

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Більше джерел

Тези доповідей конференцій з теми "Corynexochida"

1

Swisher, Robert, Mark Webster, and Melanie Hopkins. "EVALUATING THE EARLY CAMBRIAN ORIGINS AND INTER-CLADE RELATIONSHIPS OF CORYNEXOCHINE TRILOBITES; EXAMINATION OF THE GENUS ZACANTHOPSIS." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-284403.

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