Illustrated guide to the echinoid (Echinodermata: Echinoidea) fauna of South Africa Author Filander, Zoleka Author Griffiths, Charles text Zootaxa 2017 4296 1 1 72 journal article 32399 10.11646/zootaxa.4296.1.1 ad746972-3837-4f1d-bf97-c09e5d7f1bd5 1175-5326 843325 EFE86EDD-D170-4D97-87D9-3125400713EC Stereocidaris squamosa Mortensen, 1928b Fig. 13 A–C. Stereocidaris squamosa Mortensen, 1928a : 245 –247. Pl. XX, Figs 4–6 , Pl. LXX, Fig. 7 . Pl. LXXX, Figs 10–16 ; Mortensen, 1928b : 70 ; Mortensen, 1932b : 151 ; Clark & Courtman-Stock, 1976 : 218 ; Schultz, 2011 : 1060 , Figs 1844–1845 . Material examined. MBC-A077750. Identification. Has a less aborally elevated test than Stereocidaris excavata , greenish apical disc ( Mortensen 1928b ), and gonopores centrally positioned; primary spines with broad tips, with about 15 longitudinal ridges, yellowish, slightly tapered, dark line towards neck of spines; naked lines along test plates. Global maximum size. Maximum test diameter 47 mm . Global distribution. East coast region of South Africa , Tanzania , Saya da Malha Bank, at 270–374 m depth ( Mortensen 1928b ; Clark & Courtman-Stock 1976 ). Remarks. Differs from the two endemic species S. capensis and S. excavata in primary spines and genital plates, respectively. Both S. capensis and S. squamous have slightly elevated genital plates with distally positioned gonopores, but differ in the number of longitudinal ridges on the spine; the latter having about 15 and the former 12 ridges. Differs from S. excavata in raised greenish apical disc, S. excavata having a sunken one.