Ossicles comparison between Holothuria (Mertensiothuria) viridiaurantia sp. nov. and Holothuria (Mertensiothuria) hilla. A Holotype of H. (M.) viridiaurantia sp. nov.(INV EQU4309, L = 70 mm B H. (M.) hilla (INV EQU4311, L = 65 mm); showing ossicle set from dorsal papillae (tables, buttons, rods), dorsal papillae tip (showing the plate and small rods at the tip) and tube feet (tables, buttons and supporting plates); grey squares indicated in some images are presented enlarged below each image. Scale bar: 100 µm.