Librovitschiceras

Librovitschiceras Temporal range: Late Carboniferous
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Subclass:	Nautiloidea
Order:	Nautilida
Superfamily:	Aipocerataceae
Family:	Aipoceratidae
Genus:	Librovitschiceras Shimanskiy, 1957

Librovitschiceras is a genus of nautilids, in the subclass Nautiloidea, with a triangular cross section, included in the family Aipoceratidae. Its exact relationship with other aipoceratids is uncertain. Whorls are in contact, the siphuncle is slightly removed from the venter, which has a deep sinus.

Librovitschiceras lived during the Late Carboniferous in what is now western Russia. Aipoceras and are possibly related.

...
Wikipedia