Distribution & Ecology: Wallis & Futuna (Alofi); Gambier (Mangareva); Society (Tahiti); Tuamotu (Hao, Hikueru, Makatea, Marutea South?, Mataiva, Moruroa, Raroia, Takapoto) - Marine; Shoreline to 10 m; Hard bottom.

Regional Records: WALLIS & FUTUNA - Xanthias tetraodon - Poupin & Juncker, in preparation (Alofi). - FRENCH POLYNESIA - Eudora tetraodon Heller, 1865: 14, pl. 2, fig. 3 (Auckland = ? Tahiti in Forest & Guinot, 1961). - Xantho (Eudora) tetraodon - Nobili, 1907: 389 (Hao). - Juxtaxanthias tetraodon - Ward, 1942: 92 (Mangareva). - Holthuis, 1953: 22 (Raroia). - Morrison, 1954: 16 (Raroia). - Xanthias tetraodon - Forest & Guinot, 1961: 72, fig. 61, 68a-c, 69bis (Hikueru, Tahiti); 1962: 64 (Biogeography "Tahiti-Tuamotu"). - Guinot, 1966a: 48 (Raroia); 1985: 451 (List). - Monteforte, 1984: 171, annex 1, tab. a (Makatea, Mataiva, Takapoto). - Delesalle, 1985: 289 (Mataiva). - Poupin, 1996a: 51, 77 (Checklist) - New material - Coll. Frv Marara, plongeurs SMSRB, det. Poupin (Moruroa). - Remark: Odhner (1925) and Forest & Guinot (1961) consider that the type locality, Auckland, mentioned by Heller (1865) for the description of Eudora tetraodon, is a mistake, and that it could very likely be Tahiti. Forest & Guinot (1961) also indicate that this species could be a synonym of Xanthias nitidilus (Dana, 1852) (cf. under X. nitidulus).