Transitional Vertebrate Fossi10

Transitional Vertebrate Fossi10 - Transitional Vertebrate...

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Transitional Vertebrate Fossils Some transitions among reptiles I will review just a couple of the reptile phylogenies, since there are so many. ... Early reptiles to turtles: (Also see Gaffney & Meylan, in Benton 1988) Captorhinus (early-mid Permain) -- Immediate descendent of the protorothryids. Here we come to a controversy; there are two related groups of early anapsids, both descended from the captorhinids, that could have been ancestral to turtles. Reisz & Laurin (1991, 1993) believe the turtles descended from procolophonids, late Permian anapsids that had various turtle- like skull features. Others, particularly Lee (1993) think the turtle ancestors are pareiasaurs: Scutosaurus and other pareiasaurs (mid-Permian) -- Large bulky herbivorous reptiles with turtle-like skull features. Several genera had bony plates in the skin, possibly the first signs of a turtle shell. Deltavjatia vjatkensis (Permian) -- A recently discovered pareiasaur with numerous turtle-like skull features (e.g., a very high palate), limbs, and girdles, and lateral projections flaring out some of the vertebrae in a very shell-like way. (Lee, 1993) Proganochelys (late Triassic) -- a primitive turtle, with a fully turtle-like skull, beak, and shell, but with some primitive traits such as rows of little palatal teeth, a still-recognizable
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This note was uploaded on 11/22/2011 for the course GLY GLY1100 taught by Professor Jaymuza during the Spring '10 term at Broward College.

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Transitional Vertebrate Fossi10 - Transitional Vertebrate...

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