Trochoceras

Trochoceras is a trochoidally coiled nautiloid cephalopod placed in the nautilid family Rutoceratidae that lived during the Middle and Late Devonian in what is now central Europe.

The Trochoceras shell is a narrow, smooth, offset gyrocone consisting of little more than a single whorl, trochoidally grown in the sense of left hand screw. The phragmocone, with chambers, is ovate in cross section; the body or living chamber, quadrangular, with two pairs of winglike processes, one at the aperture and one at its base. The siphuncle is ventral, segments fusiform.