Type specimens of Holothuria (Mertensiothuria) viridiaurantia sp. nov. (A–F) and comparative material of Holothuria (Mertensiothuria) hilla (G–J). A Dorsal and ventral view of the alive holotype of H. (M.) viridiaurantia sp. nov. from Gulf of Cupica, Northern Chocó, Colombia (INV EQU4309, L = 70 mm) B calcareous ring and C stone canal and madreporite of the Holotype D detail of the preserved holotype tentacles E paratype from Cabo Marzo; Northern Chocó, Colombia (INV EQU4234, L = 35 mm) F smallest paratype from Gulf of Tribugá, Northern Chocó, Colombia (INV EQU4312, L = 25 mm) G, H alive specimen of H. (M.) hilla from Cabo Marzo, Northern Chocó, Colombia, and detail of tentacles in the preserved specimen (INV EQU4310, L = 100 mm) I, J preserved specimen of H. (M.) hilla, same locality as G, H and detail of tentacles (INV EQU4311, L = 65 mm). Scale bars: 2 mm (B, C); 1 cm (E, F, I).