Whiteavesites

Systematic Paleontology Order: Orthocerida Family: Clinoceratidae Genus: Whiteavesites

Whiteavesites is an orthocerid nautiloid included in the Clinoceratidae from the upper Ordovician of Manitoba. Shells are elongate, depressed fusiform orthocones and faintly curved cyrtocones that gradualy expand to the rear of the body chamber, then narrow to the aperture. Sutures are sinuous across the shells with lateral lobes and dorsal and ventral saddles. Siphuncles begin ventral of the center but become dorsal of the center anteriorly. Segments are slightly expanded into the chambers and apparently empty.

Whiteavesities from Manitoba differs from Whitfieldoceras found more broadly across North America in that its sutures are sinuous rather than straight and from European Clinoceras in that the body chambers simply contract from the base to the aperture rather than contracting at some point, then expanding.

References: Walter C. Sweet, 1964. Nautiloidea - Orthocerida Treatise on Invertebrate Paleontology, Part K.