Loading AI tools
Extinct genus of molluscs From Wikipedia, the free encyclopedia
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]
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 ranges from late in the Early Ordovician to the Devonian with more poorly known species from the Carboniferous to the Late Triassic included in the genus. The earliest known unequivocal species is Michelinoceras primum found in Cassinian age strata near the top of the Lower Ordovician El Paso Group in southern New Mexico and west Texas. A less well known species of Michelinoceras, M. primum?, comes from further down in the same formation, near the beginning of the Cassinian.
Michelinoceras named by Foeste in 1932 is the ancestral and characteristic genus of the Michelinoceratidae, established and described by Flower in 1946; derived from empty siphuncle Baltoceratidae.
Seamless Wikipedia browsing. On steroids.
Every time you click a link to Wikipedia, Wiktionary or Wikiquote in your browser's search results, it will show the modern Wikiwand interface.
Wikiwand extension is a five stars, simple, with minimum permission required to keep your browsing private, safe and transparent.