Trochoceras [SEP] parent taxon
Trochoceras
Trochoceras is a genus of trochoidally coiled nautiloid cephalopods 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.
"Trochoceras" resembles the rutoceratid "Ptenoceras" except the latter has a planar gyroconic shell with narrow projections extending laterally from the body chamber.
Species.
- "Trochoceras regale" Barrande, 1848
- "Trochoceras davidsoni" Barrande
- "Trochoceras baeri"
- "Trochoceras mccharlesi"
References.
- Bernhard Kummel, 1964. Nautiloidea -Nautilida. Treatise on Invertebrate Paleontology, Part K. Geological Soc. of America and Univ of Kansas press.