Stephanoceratidae

Stephanoceratidae
Temporal range: Middle Jurassic–Upper Jurassic
Stephanoceras blagdeni from Mid Jurassic - Germany
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: †Ammonoidea
Order: †Ammonitida
Superfamily: †Stephanoceratoidea
Family: †Stephanoceratidae
Neumayr 1875
Subfamilies

See text

Stephanoceratidae is a family of planulate and coronate ammonites within the Stephanoceratoidea.[1] Shells are evolute so that all whorls are exposed and have strong ribbing that bifurcates, that is splits in two, on the flanks. Many have tubercles at the point of bifurcation. Whorl sections are generally subequant; the outer rim, or venter, commonly rounded.[1]

Stephanoceratidae is derived from the Otoitidae. Their fossils are found in upper Middle- and lower Upper Jurassic sediments.

  1. ^ a b Arkell, Kummel, and Wright, 1957. Mesozoic Ammonoidea; Treatise on Invertebrate Paleontology, Part L, Mollusca 4.