Stephanoceratidae

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

See text

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

Subfamilies and genera


gollark: Finally fixed in PS#4F329133.
gollark: It seems like it's somehow due to the random cloud service that subsystem uses changing their policies.
gollark: *Somehow* `potatOS.incident_report` triggers the potatoBIOS string metatable bug reimplementation subsystem and makes it get stuck in an infinite loop.
gollark: I'm beginning to ponder if the string metatable bug reimplementation really was a good idea.
gollark: Okay, wow, I found a really bizarre bug.

References

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


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