Sturia

Sturia
Temporal range: Early Triassic
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Ammonoidea
Order: Ceratitida
Superfamily: Ptychitoidea
Family: Sturiidae
Genus: Sturia
Mojsisovics, 1882

Sturia is a ceratitid ammonoid from the Lower Triassic with an ammonitic suture.

Sturia produced a robust, laterally compressed, high whorled, involute shell; whorls strongly embracing. the surface is without ribs or constructions but does have sharp spiral lines. the suture is ammonitic, deeply digitate; lobes and saddles narrowly V-shaped overall. The ventral lobe is divided, 1st lateral lobe is larger than the second, which is followed by a series of auxiliary lobes decreasing in size toward the umbilicus.

J.P Smith, 1932, included Sturia in the Thalassoceratidae, but only tentatively. The American Treatise on Invertebrate Paleontology, Part L, 1957, includes Sturia in the Ptychitidae, along with such genera as Ptychites, Discoptychites, Aristoptychites, and Parasturia. Sturia is now included in the Sturiidae, established by Kipsarova. 1958, for genera such as already mentioned Sturia, Parasturia, and Discoptychites, notably distinct from genera retained in the Ptychitidae, like Ptychites.

References

This article is issued from Wikipedia - version of the Wednesday, November 18, 2015. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.