Calcinus morgani Rahayu & Forest, 1999
Illustrations. - • Male shield length 5.0 mm, Tahiti. • Ocular peduncles, color pattern.
References. - Calcinus morgani Rahayu & Forest, 1999: 465 (type locality: Indonesia).
Calcinus morgani - Minemizu, 2000: 136 (Japan). - Asakura et al., 2002: 36 (Japan). - Asakura, 2002: 42 (type specimen, plus Mariana). - Kawamoto & Okuno, 2003: 77 (Okinawa, Japan).
Calcinus gaimardii - Alcock, 1905: 56 (Minnikoy and the Maldives). - Barnard, 1950: 439 (South Africa). - Fize & Serène, 1955: 49 (Vietnam; pro parte, fig. 7, 8). - Miyake, 1956: 326 (Japan). - Lee, 1969: 53 (Taiwan). - Ball & Haig, 1972: 101 (New-Guinea). - Miyake, 1982: 114 (Japan). - Lewinsohn, 1982: 52 (Somalia). - Wooster, 1984: 132 (Mariana Islands). - Haig & Ball, 1988: 159 (Indonesia). - Yu & Foo, 1991: 37 (Taiwan). - Morgan, 1991: 876 (Australia; pro parte, form 'I', fig. 10). - Tudge, 1995: 10 (Australia; pro parte, fig. 4a, b, pl. 1, fig. e). - Poupin, 1997: 688 (Society & Tuamotu Islands, French Polynesia). - Shi, 1998: 86 (proparte, fig. 9 only; Taiwan) - [All, not C. gaimardii (H. Milne Edwards, 1848)].
Shield and cephalic appendages. - Ocular scale with a single terminal spine.
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. Distal pilosity of P3 dense, forming a brush of setae.
Armament of telson. - Left lobe of telson with several spines disposed on posterior margin only (2–5). Right lobe with several spines (1–3).
Coloration. - Shield white or cream (to grey blue). Ocular peduncle multicolored with narrow ring close to cornea. Detailed coloration of ocular peduncle: dark brown proximally, distal half blue, narrow dark ring close to cornea. Distal antennular peduncle black (basal segments also black; flagella yellow). Distal antennal peduncle yellow-orange (flagellum of the same color). Chela uniformly colored, often grading to paler distally (background black turning to brown distally; carpus of cheliped black). Ambulatory legs (P2 & P3) without ring(s) or spot(s) (dark brown with narrow white area distally).
Habitat. - Intertidal rocky shores.
Geographic distribution. - South Africa; Somalia; Madagascar; western and eastern Australia; Indo-Malaysia; Vietnam; Taiwan; Japan; New-Guinea; Vanuatu; Mariana; French Polynesia; ?Hawaii. Indo-West Pacific.
Remarks. - Sibling species of Calcinus gairmardii (H. Milne Edwards, 1848). The two species are mainly separated by their color pattern. They have been confused until Morgan (1991: 878) clearly recognizes two color forms within Calcinus gaimardii s.l., later on separated by Rahayu & Forest (1999). Geographic distribution of the two species needs to be confirmed.
