Kingdom Animalia Class Cephalopoda Superorder Orthoceratoidea Rank Genus | Phylum Mollusca Subclass Nautiloidea Order Orthocerida | |
Similar Orthocerida, Orthoceras, Nautiloid | ||
Pleurorthoceras is an orthocerid cephalopod from the Upper Ordovician of North America (Ohio, Manit). The shell externally is like that of Michelinoceras in being long and slender with a circular cross section. It differs in having a subcentral siphuncle with somewhat inflated segments.
References
Pleurorthoceras Wikipedia(Text) CC BY-SA