The Echinoid Directory

Compsocidaris Ikeda, 1939, p. 160

Diagnostic Features
  • Test moderately thick.
  • Apical disc about 50% of test diameter; generally monocyclic with oculars narrowly insert. Genital plates all similar in size; apical disc plates uniformly covered in tubercles.
  • Interambulacra with 6-8 plates in a series. Primary tubercle perforate, non-crenulate or weakly subcrenulate adapically; areoles circular and incised; separated.
  • Scrobicular tubercles differentiated. Extrascrobicular zones narrow.
  • Ambulacral zones weakly sinuous. Pore zones a little incised; pore-pairs non-conjugate. Perradial zone with marginal series of contiguous primary tubercles plus much smaller inner series.
  • Peristome smaller than apical disc. Ambulacral plates uniserial in each column; interambulacral series reaching the mouth.
  • Primary spines weakly fusiform and slender; neck and collar short; shaft smooth.
Recent, Japan.
Name gender feminine
Compsocidaris pyrsacantha Ikeda, 1939, p. 160, by original designation.
Species Included
  • Only the type species.
Classification and/or Status

Cidaroida, Cidaridae, Cidarinae.


Remarks For a recent discussion of the genus and its distinction from Lissocidaris and Calocidaris see Coppard & van Noordenburg (2007).

Ikeda, H. 1939. A new genus and new species of the Cidaridae from the Bonin Islands (Cidaroida). Records of Oceanographic Works in Japan 10, 160-164, pls 7-10.

Coppard, S. E. & van Noordenburg, H. 2007. A new species of Lissocidaris (Echinodermatat: Echinoidea: Cidaridae) from the Philippines: convergent evolution among smooth-spined cidaroids. Zootaxa 1493, 53-65.