Plagiochasma cruciferum Morton 1830 (sea urchin)

Echinoidea - Irregularia - Nucleolitidae

Alternative combinations: Ananchytes cruciferus, Echinobrissus crucifer, Nucleolites crucifer, Nucleolites cruciferus, Pygorhynchus crucifer, Rhopostoma cruciferum, Trematopygus crucifer, Trematopygus cruciferus

Synonyms: Nucleolites analis Agassiz 1857, Plagiochasma analis Agassiz 1857, Pyrina freucheni Desor 1926, Trematopygus analis dOrbigny 1855

Belongs to Plagiochasma according to A. Kroh 2001

See also Clark and Twitchell 1915, Cooke 1942 and Cooke 1959

Sister taxa: Plagiochasma lammersmaxi, Plagiochasma olfersii

Type specimens:

  • Plagiochasma cruciferum: ANSP 1464, a test
  • Nucleolites analis:
  • Pyrina freucheni:
  • Trematopygus analis:

Ecology: epifaunal grazer-deposit feeder


• Paleocene of Austria (1 collection), United States (10: Alabama, Georgia, New Jersey)

Total: 11 collections each including a single occurrence

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Specimen images are retrieved through the ePANDDA API.

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