Pleurorthoceras

Pleurorthoceras
Temporal range: U Ordovician
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Nautiloidea
Superorder: Orthoceratoidea
Order: Orthocerida
Family: Orthoceratidae
Genus: Pleurorthoceras
Flower, 1962

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

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