A new species of the genus Lithoglyptes (Cirripedia, Acrothoracica, Lithoglyptidae) offshore Island Nauru (Micronesia)

A new species of burrowing barnacles Lithoglyptides echinoideus was found i n the hydrocoral Distichopora sp. offshore Island Nauru (around 00.degrees 30' S, 166 degrees 55' E) at a depth of 19-20 m. This species possesses fou r terminal cirri and caudal appendages like other species of the genus Lith oglyptes. Its opecular bars bear conspicuous conical opercular projections with longitudinal rows of curved teeth, the lateral bars are absent, the or ificial knob is smooth and not armed with spines and setae, the caudal appe ndages are two-joined, second and third mandibular teeth differ only slight ly from denticles of the lower part of blade. L. echinoideus differs from o ther Lithoglyptes species in having several well-developed longitudinal row s of curved teeth of opercular projections and in reduced sizes of the seco nd and third mandibular teeth. It also differs from L. mitis Tomlinson and L. habei Tomlinson in the absence of armament of the orificial knob area.