Cooperoceras

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phylum Mollusca Cooperoceras is a genus of Nautiloidea, characterized by and evolute shell with an open, perforate, umbilicus, sinuous ribs at maturity, and recurved hollow spines along the ventro-lateral shoulders. The flanks and venter are flattened, the flanks converge on the dorsum, the venter has a shallow median groove. The suture is with rounded ventral and lateral lobes. The siphuncle is small, tubular, and subcentral.

Cooperoceras, known from the Lower Permian of N America and Europe (Urals), was named by Miller in 1945. The phylogenetic relationships of Cooperoceras are unclear.

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class Cephalopoda
subclass Nautiloidea
order † Nautilida
family Tainoceratidae
genus Cooperoceras