© Koninklijke Brill NV, Leiden, 2010. A new species of the family Xanthidae, Gaillardiellus holthuisi, is described based on a single male from a submarine cave in Cebu, the Philippines. Gaillardiellus holthuisi sp. nov. differs from its congeners in having thickened and peculiarly curved cheliped fingers, with each immovable finger armed with a large triangular tooth.