Psiloceras
Temporal range: |
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| Psiloceras laevis |
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| Scientific classification |
| Domain: |
Eukaryota |
| Kingdom: |
Animalia |
| Phylum: |
Mollusca |
| Class: |
Cephalopoda |
| Subclass: |
†Ammonoidea |
| Order: |
†Ammonitida |
| Family: |
†Psiloceratidae |
| Genus: |
†Psiloceras
Hyatt, 1867 |
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| Species |
- P. planorbis (Sowerby, 1824) (type) synonym Ammonites planorbis, A. sampsoni, P. sampsoni
- P. becki
- P. brevicellatum
- P. calliphylloides
- P. calliphyllum Neumayr, 1879 synonym Aegoceras calliphyllum
- P. costosum
- P. distinctum
- P. erugatum
- P. hagenowi
- P. marcouxi Guex, Taylor, Rakus & Bucher, 1998
- P. minillaensis von Hillebrandt, 2000
- P. naumanni
- P. pacificum Guex, 1980
- P. polymorphum Guex, 1980
- P. plicatulum (Quenstedt, 1883) synonym Ammonites plicatulus
- P. primocostatum von Hillebrandt, 2000
- P. psilonotum
- P. sampsoni
- P. spelae Guex, Taylor, Rakus & Bucher, 1998
- P. spelae tirolicum von Hillebrandt & Krystyn, 2009
- P. tenerum
- P. tibeticum Yin et al., 2007
- P. tilmanni Lange, 1925
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Psiloceras is an extinct genus of ammonite. Psiloceras is among the earliest known Jurassic ammonites, and the appearance of the earliest Psiloceras species form the definition for the base of the Jurassic. Unlike most earlier ammonites, which had complex shell shapes and ornamentation, Psiloceras had a smooth shell.