Transitional Fossil List 16: Cambrian Chordates

 

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Transitional Fossil List Part One: Pelycosaurs

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  Mammal like reptiles of the early Permian. Aerosaurus Romer 1937 Valid. Late Carboniferous [1]  - Lower Permian [2] United States of America [2] Angelosaurus Olson Beerbower 1953 Valid. Upper Permian [3] United States of America [3] Anglosaurus Bruner 1991 Sic N/A N/A Incorrect spelling for  Angelosaurus [4] Apsisaurus Laurin 1991 Valid. Lower Permian [5] United States of America [5] Formerly assigned as a "eosuchian" diapsid. [6] Archaeobelus Cope 1877 Syn. N/A N/A Synonym of  Clepsydrops [4] Archaeothyris Reisz 1972 Valid. Upper Carboniferous [1] United States of America [1] Archaeovenator Reisz Dilkes 2003 Valid. Upper Carboniferous [7] United States of America [7] Arribasaurus Williston 1914 Syn. N/A N/A Synonym of  Ophiacodon [8] Baldwinonus Romer Price 1940 Valid. Late Carboniferous [1]  -  Early Permian [9] United States of America [9] Basicranodon Vaughn 1958 Syn. Lower Permian [1] United States of America [1] Synonym of  Mycterosaurus [...
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Transitional Fossil List Part 4: Acanthodians

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 Shark Ancestors. Genus Status Age Location Notes † Acanthacanthus [1] Valid. Early  Lochkovian  (earliest  Devonian ). [1] Severnaya Zemlya, Russia . [1] A  vesperaliid  based on  scales . [2] † Acanthodopsis Valid. Carboniferous . [3] Europe ,  Australia . [3] An unusual  acanthodid  with tooth-like ossifications on its jaws. [3] † Acanthopora [1] Valid. Early  Lochkovian  (earliest  Devonian ). [1] Severnaya Zemlya, Russia . [1] A small  ischnacanthid  similar to  Poracanthodes . [1] † Acanthospina [1] Valid. Early  Lochkovian  (earliest  Devonian ). [1] Severnaya Zemlya, Russia . [1] A probable  ischnacanthiform  with scales similar to  hybodontiform  sharks. [1] [3] † Acanthodes Valid. Devonian ? to  Cisuralian  (Early  Permian ). [4] Europe ,  North America ,  China ? One of the most well-known acanthodians, a filter-feeding  acanthodid ...
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