| Michelinoceras Temporal range: Ordovician to Triassic
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Scientific classification 
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| 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]
- ^ Gabbott, S. E. (1999). "Orthoconic cephalopods and associated fauna from the late Ordovician Soom Shale Lagerstatte, South Africa". Palaeontology. 42: 123–148. doi:10.1111/1475-4983.00065.
- ^ a b Mehl, J. (1984). "Radula und Fangarme bei Michelinoceras sp. aus dem Silur von Bolivien" [Radula and arms of Michelinoceras sp. from the Silurian of Bolivia]. Paläontologische Zeitschrift (in German). 58 (3 / 4): 211–229. doi:10.1007/BF02986061.