Distichoceras

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

  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.