The Echinoid Directory

Goniocidaris (Discocidaris) Doderlein, 1885, p. 80

Diagnostic Features
  • Test inflated with apical disc subconical in profile.
  • Apical disc about 50% test diameter in adults; monocyclic; uniformly covered in tubercles/spines; ocular plates large. Sexual dimorphism in size of gonopores (females with large gonopores).
  • Ambulacra weakly sinuous. Pore-pairs well developed and horizontal, the two pores separated by a narrow interporal partition. Perradial zone wide with small marginal tubercle and inner zone of fine granules.
  • Perradial zone sunken and pitted.
  • Interambulacra with up to 8 plates in a series. Primary tubercles perforate, non-crenulate, with deeply incised areoles; positioned towards adradial suture.
  • Scrobicular circle strongly differentiated; extrascrobicular tubercles small and dense..
  • Pits at interradial ends of horizontal sutures in interambulacral zones.
  • Primary spines irregular, coarsely and irregularly thorned; apical spines with trumpet-like ending. Cortical hairs well developed. Basal disc well developed and often multiple on some spines.
Recent, Indo-Pacific.
Name gender masculine
Discocidaris (Cidaris) mikado Doderlein, 1885, p. 8, by original designation.
Species Included
  • G. (D.) mikado (Doderlein, 1885); Recent, Japan [includes G. (D.) peltata (Morensen, 1928); Recent, Kei Islands].
Classification and/or Status

Cidaroida, Cidaridae, Goniocidarinae.

Subgenus of Goniocidaris.


The subgenera Aspidocidaris, Cyrtocidaris, Discocidaris and Petalocidaris are distinguished primarily on spine morphology. Goniocidaris has no basal flange to its primary spines whereas the other subgenera do have such a flange ("basal disc").

Doederlein, L. 1885. Seeigel von Japan und den Liu-Kiu-Inseln. Archiv fur Naturgeschichte Berlin 51 (1), 73-112

Mortensen, T. 1928. A monograph of the Echinoidea. 1, Cidaroidea. C. A. Reitzel, Copenhagen.