Results 151 to 160 of about 598 (186)
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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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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.
Diego Rasskin-Gutman +1 more
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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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On a record of choristoderes (Diapsida, Choristodera) from the Lower Cretaceous of Western Siberia
Paleontological Journal, 2015Fossil remains (fragmentary dentaries and vertebrae) of Choristodera indet. from the Lower Cretaceous Shestakovo 1 locality (Kemerovo Region, Russia) are described. The taxon from Shestakovo is characterized by primitive vertebral features (fused neural arches and centra of the cervical vertebrae, elongated dorsal vertebrae) combined with the presence ...
Skutschas, Pavel P., Vitenko, D. D.
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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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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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The first phytosaur (Diapsida, Archosauriformes) from the Late Triassic of the Iberian Peninsula
Journal of Vertebrate Paleontology, 2014The Triassic was first defined based on the characteristic three-fold sequence of rocks that crops out across much of Europe, and many of the first records of Triassic dinosaurs, crocodile-line arc...
Octávio Mateus +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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The cranial anatomy of Chinese placodonts and the phylogeny of Placodontia (Diapsida: Sauropterygia)
2015Placodonts are Triassic marine reptiles that inhabited the eastern and western margins of the Tethys Ocean (modern South China and Europe/Middle East). Although the crania of European taxa are relatively well understood, those of Chinese taxa have not been extensively studied, and most of them have not been incorporated into a comprehensive phylogeny ...
Neenan, James M +3 more
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Limb Ontogeny, Evolution and Aquatic Adaptation in the Neodiapsida (Reptilia: Diapsida)
1995This study examines the phylogeny and ontogeny of limb evolution in the Neodiapsida (Reptilia). Patterns and sequences of limb ossification are described from the ontogenies of fossil and extant, aquatic and terrestrial, neodiapsids. Taxa described in detail include the extant squamate Varanus timorensis, the fossil neodiapsids Hovasaurus boulei ...
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