Alocolytoceras

Alocolytoceras
Temporal range: Toarcian[1]
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Ammonoidea
Order: Ammonitida
Suborder: Lytoceratina
Family: Lytoceratidae
Subfamily: Alocolytoceratinae
Genus: Alocolytoceras
Hyatt, 1900

Alocolytoceras is a lytoderatid ammonite with whorls that pass during growth from round to oval, rounded-quadrate, or compressed; with about 10 deep constrictions per whorl, with as many as 20 sharp ribs in between. The shell is evolute. All whorls are visible from either side.

Alocolytoceras belongs to the lytoceratid subfamily Alocolytoceratinae, which also includes Pachylytoceras and Pleurolytoceras. It is known from the upper Lower Jurassic of Europe and the Himalaya.

References

Notes
  1. Sepkoski, Jack (2002). "Sepkoski's Online Genus Database". Retrieved 2014-05-28.
Bibliography
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