Calcinus vachoni Forest, 1958
Illustrations. - • Male paratype, shield length 2.4 mm, Vietnam. Watercolor from R. Serčne unpublished notes. • Male shield length 3.7 mm, Tuamotu. • Ocular peduncles, pigmentation. ocular peduncles: variation of pigmentation.
References. - Calcinus vachoni Forest, 1958: 285 (type locality: Vietnam).
Calcinus vachoni - Baba, 1982: 58, 65 (Palau and Yap; south of Japan). - Morgan, 1990: 11 (Western Australia); 1991: 905 (Western Australia). - Gherardi & McLaughlin, 1994: 624 (Mauritius). - Poupin, 1997: 712, fig. 6e-f, 8a-f (Fangataufa atoll, Tuamotu, French Polynesia). - Shih & Lee, 1997: 22, fig. 1–3 (Taiwan). - Shih, 1998: 93, fig. 33–35 (In chinese; color illustrations; Taiwan). - Kawamoto & Okuno, 2003: 78 (Okinawa, Japan). - Poupin et al., 2003: 95 (Easter Island).
Calcinus seurati - Matsuzawa, 1977: pl. 79, fig. 3. - Miyake, 1983: 113. - Nomura et al., 1988: 113 (Japan). - Takeda, 1994: 194, fig. 2 [Not Calcinus seurati Forest, 1951. According to color illustrations, these Japanese specimens belong to C. vachoni.]
[Not Calcinus vachoni - Lewinsohn, 1982: 53 (Somalia) = Calcinus guamensis Wooster, 1984 (see Gherardi & McLaughlin, 1994: 624)].
Shield and cephalic appendages. - Ocular scale with several terminal spines.
Chelipeds (P1). - Upper margin of right chela tuberculated or spinous. Outer face of left palm regularly convex.
Ambulatory legs (P2-P3). - Dactyl of P3 subequal to propodus or slightly shorter (0.7–0.9). Distal pilosity of P3 more prononced than on distal P2, but not forming a dense brush of setae.
Armament of telson. - Left lobe of telson with several spines disposed on posterior and lateral margins (3–8 on lateral margin, 4–7 on posterior margin). Right lobe with several spines (4–8).
Coloration. - Shield white or cream. Ocular peduncle multicolored without narrow ring close to cornea. Detailed coloration of ocular peduncle: cream, with large black patch or ring (black patch of variable extension, sometimes missing). Distal antennular peduncle blue or dark blue (flagella of the same color). Distal antennal peduncle yellow-orange (basal segments cream; flagellum yellow). Chela uniformly colored, often grading to paler distally (blue-grey). Ambulatory legs (P2 & P3) without ring(s) or spot(s) (cream to grey-blue).
Habitat. - Intertidal rocky shores, shallow-waters.
Geographic distribution. - Widely distributed: Indian ocean: Mauritius and Western Australia. Pacific ocean: Vietnam, Taiwan, Micronesia, Japan, French Polynesia, Easter Island. Indo-West Pacific.
