The Echinoid Directory

Goniocidaris (Petalocidaris) Mortensen, 1903, p. 18

[?=Delocidaris Philip, 1964, p. 464, type species Goniocidaris prunispinosa Chapman & Cudmore, 1928]

Diagnostic Features	Apical disc about 50% test diameter in adults; monocyclic; uniformly covered in tubercles/spines; ocular plates large. Shows sexually dimorphism in size of gonopores. Ambulacra relatively straight and wide. Pore-pairs well developed and horizontal, the two pores separated by a well-developed interporal partition. Interporal zone wide with marginal tubercle and inner zone of fine granules. Perradial suture incised. Interambulacra with 6-7 plates in a series. Primary tubercles perforate, non-crenulate, with deeply incised areoles. Scrobicular circle strongly differentiated; extrascrobicular zone narrow and poorly developed. Horizontal and interradial sutures deeply furrowed. Primary spines irregular, coarsely and irregularly thorned, many with basal disc; apical spines with trumpet-like ending. Cortical hairs well developed.
Distribution	Miocene to Recent, Indo-Pacific.
Name gender	feminine
Type	Goniocidaris florigera Agassiz, 1879, p. 198, by original designation.
Species Included	G. (P.) florigera (Agassiz, 1879); Recent, Indo-Pacific. G. (P.) spinosa Mortensen, 1928; Recent, Philippines. G. (P.) biserialis (Doderlein, 1885); Recent, Japan. G. prunispinosa Chapman & Cudmore, 1928; Miocene, Australia.
Classification and/or Status	Cidaroida, Cidaridae, Goniocidarinae. Subgenus of Goniocidaris.
Remarks	Differs from Goniocidaris sensu stricto only in having a well developed flange near the base of the shaft on some of the primary spines. Delocidaris was originally established on the basis of spines that are virtually indistinguishable from those of G. biserialis. Mortensen, T. 1928. A monograph of the Echinoidea. 1, Cidaroidea. C. A. Reitzel, Copenhagen.