Results 111 to 120 of about 303 (138)
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The pachypleurosaurid Dactylosaurus schroederi (Diapsida: Sauropterygia)
Canadian Journal of Earth Sciences, 1985Redescription of the small pachypleurosaurid nothosaur Dactylosaurus schroederi Nopsca, 1928, from the Muschelkalk of Upper Silesia (Gorny Slask), Poland, indicates that it closely resembles Neusticosaurus but differs from the latter in a number of features. The forelimb, especially the antebrachium, is very gracile.
Hans-Dieter Sues, Robert L. Carroll
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Postcranial paleoneurology of the Diapsida
Journal of Zoology, 1995The relationships between the size of the spinal cord and the size of the neural canal, and between gross spinal cord anatomy and locomotor style, were documented in a wide range of living diapsids. Observed relationships were used to make predictions about spinal cord anatomy and about limb use and position in related fossil taxa.
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Phylogeny of Drepanosauridae (Reptilia: Diapsida)
Journal of Systematic Palaeontology, 2004Synopsis Phylogenetic analysis reveals that the Triassic diapsid family Drepanosauridae is closely related to Coelurosauravus and Longisquama. These three taxa are part of a clade for which the name Avicephala (defined as all taxa more closely related to Coelurosauravus and Megalancosaurus than to Neodiapsida) is coined. Avicephala is a sister taxon to
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Heterochrony and tooth evolution in hyperodapedontine rhynchosaurs (Reptilia, Diapsida)
Lethaia, 2000The tooth arrangement of hyperodapedontine rhynchosaurs shows clear patterns of morphological derivation, which can be summarized as three main apomorphic trends: the increase in the number of tooth rows lateral to the main maxillary groove, the loss of dental structures (medial groove and lingual teeth) medial to the main maxillary groove, and the ...
Max C. Langer +2 more
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Theoretical morphology of the Archosaur (Reptilia: Diapsida) pelvic girdle
Paleobiology, 2001Theoretical models of skeletal structures provide suitable frameworks to assess macroevolutionary patterns of form change. We discuss three theoretical approaches to account for morphological patterns of the pelvic girdle in archosaurs. Every approach targets a different level of organization within the concept of morphospace.
Diego Rasskin-Gutman +1 more
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Sexual dimorphism in Champsosaurus (Diapsida, Choristodera)
Lethaia, 2004Two nearly complete specimens of Champsosaurus (Diapsida, Choristodera) with distinctive morphologies, from the Tullock Formation (Early Paleocene) of northeastern Montana, USA, were described as different species. The limb bones of C. ambulator are more robust than those of C. laramiensis, indicating that C. ambulator was more adapted for walking than
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A new eosauropterygian (Diapsida, Sauropterygia) from the Triassic of China
Journal of Vertebrate Paleontology, 2012ABSTRACT A new Middle Triassic sauropterygian, Qianxisaurus chajiangensis, gen. et sp. nov., is described on the basis of a skeleton from the Zhuganpo Member (Ladinian) of the Falang Formation, Xingyi, southwestern Guizhou Province, China. It is primarily characterized by a premaxilla with eight teeth, marginal teeth with a slightly constricted ...
Yen-Nien Cheng +3 more
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A new archosaur (Diapsida, Archosauriformes) from the marine Triassic of China
Journal of Vertebrate Paleontology, 2012ABSTRACT A new Middle Triassic archosaur, Diandongosuchus fuyuanensis, gen. et sp. nov., is described on the basis of a skeleton from the Zhuganpo Member (Ladinian) of the Falang Formation, eastern Yunnan Province, China. It is primarily characterized by the nasal process of the premaxilla extending posteriorly well beyond the external naris, the super-
Chun Li +4 more
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Fusion of sacrals and anatomy inChampsosaurus(Diapsida, Choristodera)
Historical Biology, 2007Sacral centra are occasionally fused with or without severe deformation in Champsosaurus (Diapsida, Choristodera). The sympatrical occurrence of fusion and non-fusion of sacra in adults through their evolution questions that sacral fusion represents the final form of a simple ontogenetic change or specific variation.
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Journal of Morphology, 2004
Homologies of muscles of the m. transversospinalis group in the dorsal and cervical regions in Sauria are established based on detailed dissections and published accounts of lepidosaurs, crocodylians, and birds. Attachments and directions of tendons comprising this muscle group are fairly conserved among the saurian clades, enabling rather robust ...
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Homologies of muscles of the m. transversospinalis group in the dorsal and cervical regions in Sauria are established based on detailed dissections and published accounts of lepidosaurs, crocodylians, and birds. Attachments and directions of tendons comprising this muscle group are fairly conserved among the saurian clades, enabling rather robust ...
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