Puneet Varma (Editor)

Stenopopanoceras

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Kingdom  Animalia
Class  Cephalopoda
Order  Ceratitida
Rank  Genus
Phylum  Mollusca
Subclass  Ammonoidea
Superfamily  Megaphyllitoidea
Similar  Gymnites, Monophyllites, Paraceratites

Stenopopanoceras is a genus of involute, discoidal ceratitid ammonites from the Middle Triassic that has been found on Spitsbergen and in arctic Russia and British Columbia.

The name, Stenopopanoceras, indicates that its shell as compressed, relatively thin; involute as for the family. The siphuncle is ventral throughout, unlike Parapopanoceras where in the siphuncle starts off more centrally located and migrates within the fist few whorls to become ventral. Septal necks start off retrochoanitic, pointing to the rear, but by the beginning of the third whorl are prochoanitic, forward pointing.

Related general include Amphipopanoceras and Parapopanoceras.

References

Stenopopanoceras Wikipedia


Similar Topics
Gymnites
Monophyllites
Paraceratites
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