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Distichoceras

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Distichoceras
Temporal range: Callovian–Oxfordian[1]
Distichoceras zeissi, described by Nicolas Théobald, Scientific Annals of the University of Besançon, 2nd series, Géologie 8 (1958) p. 3-7
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Ammonoidea
Order: Ammonitida
Family: Oppeliidae
Subfamily: Distichoceratinae
Genus: Distichoceras
Munier-Chalmas, 1892
Species

see text

Distichoceras is a member of the Haploceratacean family, Oppeliidae, and type genus for the subfamily Distichoceratinae, found in upper Middle and lower Upper Jurassic sediments in Europe,[2] Algeria, India, and Madagascar. The shell is essentially evolute and compressed with the outer flanks converging on a narrow, keeled venter; inner flanks which may be feebly ribbed, are separated from outer by a shallow spiral groove or band. Ribs on outer flanks end on or are looped to tall clavi (elongate tubercles or nodes) that line the venter, standing above the keel.

References

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  1. ^ Sepkoski, Jack (2002). "A compendium of fossil marine animal genera (Cephalopoda entry)". Bulletins of American Paleontology. 363: 1–560. Archived from the original on 2008-05-07. Retrieved 2017-10-18.
  2. ^ "Paleobiology Database - Distichoceras". Retrieved 2017-10-19.
  • Arkell et al., 1957. Mesozoic Ammonoidea, Treatise on Invertebrate Paleontology Part L. Geological Soc. of America and Univ Kansas Press. p. L279.