Michelinoceras

Michelinoceras
Temporal range: Ordovician to Triassic
Scientific classification Edit this 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]

  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.
  2. ^ 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.