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The first articulated skeleton of Dendrerpeton acadianum (Temnospondyli, Dendrerpetontidae) from the Lower Pennsylvanian locality of Joggins, Nova Scotia, and a review of its relationships
TLDR
Although Dendrerpeton bears a general resemblance to the highly terrestrial dissorophoid temnospondyls and even shares with them a large squamosal embayment supported ventrally by the quadratojugal and a quadrate process, phylogenetic analysis does not support a sister-group relationship.
The Carboniferous Amphibian Proterogyrinus scheelei Romer, and the Early Evolution of Tetrapods
TLDR
Proterogyrinus scheelei Romer, from the Upper Mississippian of Greer, West Virginia, is one of the earliest known members of the amphibian infraorder Embolomeri, and has no undisputed synapomorphies with reptiles either, making it impossible to support close relationship between the two groups.
A new species of Chasmosaurus (Dinosauria: Ceratopsia) from the Dinosaur Park Formation of southern Alberta
Chasmosaurus irvinensis (sp. nov.) is distinguished from other species of this genus by the possession of a broad snout, absence of a brow horn (the position of which is occupied by a pit or
The skull and jaw musculature as guides to the ancestry of salamanders
TLDR
Reconstruction of the probable pattern of the jaw musculature in Paleozoic amphibians indicates that frogs and salamanders might have evolved from a condition hypothesized for primitive labyrinthodonts, but the presence of a large otic notch in dissorophids suggests specialization toward the anuran, not the urodele condition.
PLIOPLATECARPUS PRIMAEVUS (MOSASAURIDAE) FROM THE BEARPAW FORMATION (CAMPANIAN, UPPER CRETACEOUS) OF THE NORTH AMERICAN WESTERN INTERIOR SEAWAY
  • R. Holmes
  • Environmental Science
  • 31 December 1996
ABSTRACT One almost complete mosasaur skeleton and much additional material from the Upper Cretaceous Bearpaw Formation of South Central Saskatchewan permits the first adequate description and
Cranial morphology and systematics of Chasmosaurus (Dinosauria: Ceratopsidae) from the Upper Cretaceous of western Canada
ABSTRACT The ceratopsid dinosaur genus Chasmosaurus from the Judith River Formation (Campanian; Judithian) of western Canada shows considerable variability in cranial morphology due in part to an
Variation in the Skull of Anchiceratops (Dinosauria, Ceratopsidae) from the Horseshoe Canyon Formation (Upper Cretaceous) of Alberta
TLDR
All material from the HCF that can be positively attributed to Anchiceratops are described, and no compelling evidence for dimorphism is found, concluding that there is a single, variable species of Anchicatops, A. ornatus.
New information on the Skull of Keichousaurus hui (Reptilia: Sauropterygia) with Comments on Sauropterygian Interrelationships
TLDR
A phylogenetic analysis suggests that Keichousaurus is more appropriately considered a basal nothosauroid rather than a pachypleurosauroid, and that the Eusauropterygia is paraphyletic.
A new species of mosasaur (Squamata: Mosasauridae) from the Pierre Shale (lower Campanian) of Manitoba
Plioplatecarpus nichollsae, sp. nov., from the lower Campanian (Pembina Member, Pierre Shale Formation) is diagnosed by the following: a thickened ventral rim of the external naris, a short
Sexual Dimorphism and Life History of Keichousaurus hui (Reptilia: Sauropterygia)
TLDR
A large collection of recently prepared, complete specimens of Keichousaurus hui provides a wealth of new anatomical data for this taxon, finding sexual maturity was reached in males at approximately 126 mm snout-vent length (SVL), and in females by 122 mm SVL.
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