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(Selenka, 1867)

H. (Cystipus) rigida is a white to grey species, often covered with sand, with a double row of dark spots along upper surface, and a lateral row of blunt papillae on each side. It is a stout, flattened and rigid species (size to 75 mm), with 20 tentacles (H. rigida photo). Spicules are low tables, fenestrated spheres and knobbed buttons (H. rigida spicules). It may be found on reef flats below rocks.

Remarks: A second species in this subgenus, H. (Cystipus) inhabilis recognised by a lack of fenestrated spheres, simpler tables and more irregular buttons has been reported from northern reefs.

Holothuria rigida