Trispectes
Encyclopedia
Trispectes is an extinct prehistoric nautiloid genus belonging to the Orthocerida
, a variety of mostly straight-shelled cephalopods.
Orthocerida
Orthocerida is an order of extinct nautiloid cephalopods also known as the Michelinocerda that lived from the Early Ordovician possibly to the Late Triassic . A fossil found in the Caucasus suggests they may even have survived until the Early Cretaceous...
, a variety of mostly straight-shelled cephalopods.