Cooperoceras

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. For more information, visit the Wikipedia entry. Get back to Nautiloidea
class	Cephalopoda
subclass	Nautiloidea
order	† Nautilida
family	Tainoceratidae
genus	Cooperoceras

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  CollectA 88946 Cooperoceras