The Echinoid Directory

Ceratophysa Pomel, 1883, p. 40

[=Rodocystis Lambert & Thiery, 1924, p. 424 (subjective) ]

Diagnostic Features
  • Test large and triangular in outline, with shallow, wide anterior notch at ambitus but deep, narrow groove leading to peristome on oral surface; thin-shelled.
  • Strongly developed subanal rostrum.
  • Apical disc with four gonopores. Compact, with single anterior plate followed by ocular plates with gonopores. Disjunct with posterior oculars separated from remainder of disc
  • Ambulacra all similar with minute pores only.
  • Peristome small and facing forwards into anterior groove.
  • Plastron structure unknown.
  • Scattered small tubercles distributed over the aboral surface.
  • Periproct aboral, with overarching interambulacral hood.
  • Subanal fasciole at end of rostrum.
Recent; Antarctic and subantarctic waters.
Name gender feminine
Pourtalesia ceratopyga A. Agassiz, 1879, p. 205, by subsequent designation of Mortensen, 1907, p. 82.
Species Included
  • C. ceratopyga (A. Agassiz, 1879); Recent
  • C. ? rosea (A. Agassiz, 1879); Recent
Classification and/or Status

Holasteroida, Meridosternata, Urechinina, Pourtalesiidae.

Presumed monophyletic.


Differs from Pourtalesia in having a greatly expanded and Y-shaped anterior. Differs from the rather similarly shaped Echinocrepis in having a well-developed subanal rostrum and the periproct aboral.

Mortensen, T.1950. A Monograph of the Echinoidea. V.1. Spatangoida 1. C. A. Reitzel, Copenhagen.

Pomel, A. 1883. Classification méthodique et genera des Échinides vivante et fossiles. Thèses présentées a la Faculté des Sciences de Paris pour obtenir le Grade de Docteur ès Sciences Naturelles, 503, 131 pp. Aldolphe Jourdan, Alger.