The Echinoid Directory

Psychocidaris Ikeda, 1935, p. 386

Diagnostic Features
A subgenus of Tylocidaris with:
  • glandiform aboral spines with dense cortical hairs forming a fused secondary overgrowth
  • oral spines with longitudinal flanges.
Recent, Bonin Island and Philippines.
Name gender feminine
Psychocidaris ohshimai Ikeda, 1935, p. 386, by original designation.
Species Included
  • Only the type species.
Classification and/or Status

Cidaroida, Psychocidaridae

Monotypic; treated as a subgenus of Tylocidaris


T. (Tylocidaris) differs in having spines that are ornamented with beaded or thorned ribs.

Ikeda, H. 1935. Preliminary report on a new cidaroid sea-urchin from the western Pacific. Proceedings of the Imperial Academy of Japan, Tokyo, 11, 386-388.