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It was initially assigned to the family Trematochampsidae
Cephalopoda - Ammonitida - Pseudotissotiidae
You can also see a replacement germ tooth emerging at the base of one of the main teeth
"A partial skeleton of the basal mosasaur Halisaurus platyspondylus from the Severn Formation (Upper Cretaceous: Maastrichtian) of Maryland" (PDF)
06976 - Top Beautiful 2.00 Inch Alethopteris sp Carboniferous Fossil Fern Gruenewaldtia It was initially assigned toAlethopteris, Sternberg 1825 Alethopteridae Alethopteridae PaleoDB taxon number: 125733 Parent taxon: Alethopteridae according to D. L. Dilcher et al. 2005 Sister taxa: none Subtaxa: Alethopteris roesserti, Alethopteris valida, Alethopteris whitneyi VIEW CLASIFICATION Environments: (59 collections), terrestrial (10), deltaic (4), fluvial (2), lagoonal restricted shallow subtidal (2), delta plain (2), mire swamp (2), "floodplain" (1), lacustrine small
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