The Echinoid Directory

Cystocrepis Mortensen, 1907, p. 84

Diagnostic Features
  • Test large and bullet-shaped in outline, with slight anterior notch at ambitus but deep, narrow groove leading to peristome on oral surface; thin-shelled.
  • Apical disc with four gonopores. Compact in pourtalesiid style.
  • Ambulacra all similar with minute pores only.
  • Peristome subcircular and facing anteriorly into frontal groove.
  • Plastron plating orthosternous; sternal plate followed by a pair of symmetrical episternal plates.
  • Plastron plating disjunct.
  • Ambulacra I and V disjunct on oral surface; separated by intercalated plates of interambulacra 1 and 4 that meet along the mid-line.
  • Scattered small tubercles distributed over the aboral surface.
  • Periproct inframarginal, with no overarching interambulacral hood.
  • No posterior rostrum.
  • No subanal fasciole.
Distribution
Recent; Panama.
Name gender feminine
Type
Echinocrepis setigera A. Agassiz, 1898, p. 78, by original designation.
Species Included
  • Only the type species
Classification and/or Status

Holasteroida, Meridosternata, Urechinina, Pourtalesiidae.

Monotypic.

Remarks

Closest to Echinocrepis which also has an inframarginal periproct and no subanal fasciole, but differing from that taxon in having ambulacra I and V disjunct - separated by plates of interambulacra 1 and 4 which meet along the midline. It also has a very different outline.

Agassiz A. 1904. Reports on an exploration off the west coasts of Mexico, central and south America and off the Galapagos Islands. Memoirs of the Museum of Comparative Zoology at Harvard University 31.

Mortensen, T. 1907. Danish Ingolf Expedition 4(2) Echinoidea, part 2.

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