FIGURE 21 in Euryalid brittle stars from the International Indian Ocean Expedition 1963 - 64 (Echinodermata: Ophiuroidea: Euryalida)

FIGURE 21. Astrocyclus somaliensis, holotype (USNM 1411388), SEM photographs of ossicles. A, articulations for arm spines of lateral arm plate on basal portion of the arm; B–C, hooklets-bearing plate on distal portion of the arm, external view (B) and internal view (C), arrowheads indicate articulations for hooklets; D–F, arm spines on basal (D, E) and distal (F) portion of the arm, arcs indicate terminal projections; G–H, hooklets on basal (G) and distal (H) portion of the arm. Abbreviations: NO, nerve opening; ST, secondary tooth.