The last review of the genus Actinocyclus consider only two valid species for the genus: Actinocyclusverrucosus Ehrenberg, 1831 (type species of the genus) and Actinocycluspapillatus (Bergh, 1878), both with a geographical distribution in the Indo-Pacific. The anatomy of these species is still unknown, except for some scanty anatomical information. A detailed anatomical study of Actinocyclusverrucosus is performed, including inedited structures such as digestive system, odontophore muscles and circulatory system, beyond complementary information on the commonly studied structures, in order to clarify the taxonomy and distribution.