psiloceratacean

English

Etymology

Psilocerataceae +‎ -an

Noun

psiloceratacean (plural psilocerataceans)

1. Any ammonoid cephalopod of the superfamily Psilocerataceae.
   • 2016 January 21, “The Oldest Jurassic Dinosaur: A Basal Neotheropod from the Hettangian of Great Britain”, in PLOS ONE‎^[1], →DOI:

     Many British stratigraphers have historically used the first occurrence of the ammonite Psiloceras planorbis to indicate the base of the Jurassic, but elsewhere in Europe two other psiloceratacean ammonites appear before P.