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Eogymnotoceras thompsoni Bucher 1988 (ceratite)

Cephalopoda - Ammonoidea - Beyrichitidae

PaleoDB taxon number: 176855

Full reference: H. Bucher. 1988. A new Middle Anisian (Middle Triassic) ammonoid zone from northwestern Nevada. Eclogae Geologicae Helvetiae 81(3):723-762

Belongs to Eogymnotoceras according to C. Ji and H. Bucher 2018

Sister taxa: Eogymnotoceras beachi, Eogymnotoceras deleeni, Eogymnotoceras janvieri, Eogymnotoceras liardense, Eogymnotoceras transiens, Eogymnotoceras tuberculatum

Type specimen: USNM 427255, a shell. Its type locality is Favret Canyon HB 173, Augusta Mountains, which is in a Pelsonian marine limestone in the Favret Formation of Nevada.

Ecology: nektonic carnivore

Average measurements (in mm): shell width 15.0, shell diameter 49.6