Kingdom Animalia Class Cephalopoda Order Actinocerida Rank Genus | Phylum Mollusca Subclass Nautiloidea Family Actinoceratidae | |
Paractinoceras is a genus of long straight slender actinocerid nautiloid with siphuncular segments in the early stages like those of Actinoceras, becoming narrower in the later stages of the chambered phragmocone like those in Ormoceras. As with Kochoceras and Floweroceras Paractinoceras is considered a separate genus within the Actinoceratidae, distinct from Actinoceras.
References
Paractinoceras Wikipedia(Text) CC BY-SA