The Echinoid Directory

Goniocidaris (Cyrtocidaris) Mortensen, 1927, p. 264

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 long and slender, often curved and with coat of fine hairs; basal and terminal discs present on most spines.
Distribution	Recent, Philippines.
Name gender	masculine
Type	Goniocidaris (Cyrtocidaris) tenuispina Mortensen, 1927, p. 264, by original designation.
Species Included	Only the type species.
Classification and/or Status	Cidaroida, Cidaridae, Goniocidarinae. Subgenus of Goniocidaris Desor, 1846.
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"). Mortensen, T. 1928. A monograph of the Echinoidea. 1, Cidaroidea. C. A. Reitzel, Copenhagen.