Distribution & Ecology: Wallis & Futuna (Wallis); Marquesas (Nuku Hiva, Fatu Hiva); Gambier (Tarauru-Roa, Vaiatekeue); Society (Tahiti); Tuamotu (Hao, Hikueru, Fakahina, Fangataufa, Moruroa, Rangiroa, Raroia, Taiaro, Takume); Pitcairn (Henderson) - Marine; Shoreline to 10 m; Hard bottom

Regional Records: WALLIS & FUTUNA - Calcinus seurati - Poupin & Juncker, in preparation (Wallis). - FRENCH POLYNESIA - Calcinus herbstii - Nobili, 1907: 368 (Hao, Fakahina, "Taraourouroa" = Tarauru-Roa, "chenal Waiatekene" = Vaiatekeue) pro parte not C. herbstii de Man, 1888, synonym of C. laevimanus = C. seurati fide Forest (1951: 86). - Calcinus seurati Forest, 1951: 84, fig. 1, 3-4, 7-8 (Nobili's material); 1953b: 556; 1956a: 1062 (Hikueru, Tahiti, Takume). - Holthuis, 1953: 44 (Raroia, Takume). - Morrison, 1954: 7 (Raroia). - Rahayu, 1988: 19 (Hikueru, Tahiti, Takume). - Poupin, 1994a: 19, fig. 15, pl. 2d (Hao, Taiaro); 1996a: 4, 15 (Checklist); 1997: 710, fig. 2h, 3i, 4f (Hao, Moruroa, Nuku Hiva, Taiaro; coll. Frv Marara) - Field observation - May 1997, J. Poupin (Fangataufa). - Unpublished record, coll. & det. G. Paulay (Rangiroa); det. J. Poupin, Pitcairn Islands, Henderson Island, North Beach, reef flat, coll. J. Starmer, January 01, 1997, 1 sp. in shell (UF 2607), 1 male 5.5 mm, 1 male 4.5 mm, 2 sp. in shell (UF 2604). - Moorea Biocode project. - AAMP, Marquesas, 2012, coll. N. Evans, Leg 2, St. 20, 34; Leg 3, St. MQ5-M, Nuku Hiva, intertidal, coll. Starmer, Poupin, photo in situ, no sample, St. MQ12-M, Tahuata, intertidal, coll. Corbari et al., sample LC112, LC113, St. MQ16-M, Fatu Hiva, intertidal, coll. Corbari et al., sample LC170, St. MQ23-R, Ua Pou, intertidal, m, coll. Corbari et al., sample LC284