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The origin of squamates revealed by a Middle Triassic lizard from the Italian Alps
Divergence time estimates show that lepidosaurs and most other diapsids originated before the Permian/Triassic extinction event, indicating that the Triassic was a period of radiation, not origin, for several diapsid lineages.
NEW TAXA OF TRANSVERSELY-TOOTHED LIZARDS (SQUAMATA: SCINCOMORPHA) AND NEW INFORMATION ON THE EVOLUTIONARY HISTORY OF “TEIIDS”
The results of a phylogenetic analysis support a monophyletic grouping of the transversely-toothed taxa with Bicuspidon as the sister taxon ofpolyglyphanodontini new taxon, which is comprised of Polyglyphanodon, Dicothodon, and Peneteius and indicates that Teiidae has no demonstrable pre-Tertiary occurrence.
A new teiid lizard from the Cedar Mountain Formation (Albian–Cenomanian Boundary) of Utah
The new taxon recovered from the Cedar Mountain Formation of Emery County, Utah, is the oldest teiid that is represented by numerous specimens and represents an example of the morphologically antecedent dental specializations that culminated in the strikingly specialized dentition of Polyglyphanodon sternbergi.
Biogeography of terrestrial and freshwater vertebrates from the late Cretaceous (Campanian) Western Interior of North America
A NEW TAXON OF HELODERMATID-LIKE LIZARD FROM THE ALBIAN–CENOMANIAN OF UTAH
- R. Nydam
- 27 June 2000
A new platynotan lizard from the Mussentuchit Local Fauna, Cedar Mountain Formation of Utah is unique in having a premaxillary process of the maxilla that forms a vertical flange and fine serrations on anterior and posterior edges of themaxillary teeth.
Lizards from the Lower Cretaceous (Aptian–Albian) Antlers and Cloverly Formations
Abstract Recent discoveries from the Aptian–Albian Antlers (Oklahoma) and Cloverly (Montana, Wyoming) formations provide significant additions to the Early Cretaceous record of lizards in North…
The oldest known snakes from the Middle Jurassic-Lower Cretaceous provide insights on snake evolution.
- M. Caldwell, R. Nydam, A. Palci, S. Apesteguía
- Environmental ScienceNature communications
- 27 January 2015
Snake fossils that extend the record backwards in time by an additional ~70 million years (Middle Jurassic-Lower Cretaceous) are reported on, suggesting that snakes had undergone habitat differentiation and geographic radiation by the mid-Jurassic.
POLYGLYPHANODONTINAE ( SQUAMATA : TEIIDAE ) FROM THE MEDIAL AND LATE CRETACEOUS : NEW TAXA FROM UTAH , U . S . A . AND BAJA CALIFORNIA DEL NORTE , MEXICO
- R. Nydam
THE MAMMAL-LIKE TEETH OF THE LATE CRETACEOUS LIZARD PENETEIUS AQUILONIUS Estes 1969(SQUAMATA, TEIIDAE)
This poster presents a probabilistic procedure for estimating the intensity of the response of the immune system to carbon dioxide in response to the presence of carboniferous strata.
Squamates from the Jurassic and Cretaceous of North America
- R. Nydam
- Geography, Environmental SciencePalaeobiodiversity and Palaeoenvironments
- 2 October 2013
Squamates from the Mesozoic of North America have been collected since the end of the nineteenth century. To date, the fossils are known to occur in the Late Jurassic, Aptian-Albian, Cenomanian,…