The Echinoid Directory

Goniocidaris (Aspidocidaris) Mortensen, 1928, p. 67

Diagnostic Features	Test inflated with apical disc subconical in profile. Apical disc about 50% test diameter in adults; dicyclic; 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 two inner granules. Perradial zone sunken with horizontal grooves. 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. Interradial suture forming distinct sunken groove. Primary spines irregular, coarsely and irregularly thorned; apical spines with trumpet-like ending. Cortical hairs well developed. Basal disc present on some spines.
Distribution	Recent, Indo-Pacific.
Name gender	masculine
Type	Goniocidaris clypeata Doderlein, 1885, p. 10, by original designation.
Species Included	G. (A.) clypeata Doderlein, 1885; Recent, Japan. G. (A.) fimbriata (de Meijere); Recent, Malay archipelago. G. (A.) alba Mortensen, 1928; Recent, Japan. G. (A.) crassa Mortensen, 1928; Recent, Mindanao. G. (A.) sibogae Mortensen, 1928; Recent, Japan. G. (A.) australiae Mortensen, 1928; Recent, Australia.
Classification and/or Status	Cidaroida, Cidaridae, Goniocidarinae. Subgenus of Goniocidaris.
Remarks	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"). For an account of the fossil record of this genus see Philip (1964). Mortensen, T. 1928. A monograph of the Echinoidea. 1, Cidaroidea. C. A. Reitzel, Copenhagen. Philip, G. M. 1964. The Tertiary echinoids of South-East Australia. Proceedings of the Royal Society of Victoria 77, 433-477, pls 58-67.