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.
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| Trochoceras regale, from Lochkov, Czech Republic, at National Museum (Prague) | |
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| Genus: | Trochoceras Barrande, 1848 |
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
gollark: Also lossy.
gollark: On some bad devices, yes.
gollark: Hey, mine are mounted rw, fun!
gollark: How did systemd do that?
gollark: Fun activity: `dd if=/dev/urandom of=/sys/firmware/efivars/*`
References
- Bernhard Kummel, 1964. Nautiloidea -Nautilida. Treatise on Invertebrate Paleontology, Part K. Geological Soc. of America and Univ of Kansas press.
- Biolib
- Zipcodezoo
- Museum of Comparative Zoology – Harvard University
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