Psiloceras
Sign in to savePsiloceras 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.
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- Taxonomy
- Biostratigraphic significance
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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.
==Taxonomy== Almost all ammonites, with the sole exemption of a few members of the family Psiloceratidae, including Psiloceras were wiped out at the Triassic–Jurassic extinction event (201.3 million years ago).
Excerpted from Wikipedia’s “Psiloceras” article, available under the CC BY-SA 4.0 licence.