Michelinoceras Temporal range: Ordovician to Triassic
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Scientific classification ![]() | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Mollusca |
Class: | Cephalopoda |
Order: | †Orthocerida |
Family: | †Michelinoceratidae |
Genus: | †Michelinoceras Foeste, 1932 |
Michelinoceras is the oldest known genus of the Michelinocerida, more commonly known as the Orthocerida, characterized by long, slender, nearly cylindrical orthocones with a circular cross section, long camerae, very long body chambers, and a central or near central tubular siphuncle free of organic deposits. Septal necks are straight; connecting rings cylindrical and thin. Cameral deposits are well developed. A radula has been found in one species,[1] with seven teeth per row.[2] It had ten arms, two of which formed longer tentacles.[2]
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