psiloceratacean

名词 n.

英文释义

名词 n.
  1. Any ammonoid cephalopod of the superfamily Psilocerataceae.
    — 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.

词形变化

psilocerataceans plural

词源

Psilocerataceae + -an
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