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