Michelinoceras

Michelinoceras; Temporal range: Ordovician to Triassic
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]

^ 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.

[Gabbott1999-1] 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.

[Mehl1984-2] 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.

[1]

[2]