Calcinus isabellae Poupin, 1997
Illustrations. - Male holotype shield length 4.6 mm, Tuamotu. Male holotype shield length 4.6 mm, Tuamotu. ocular peduncles, color pattern. Aspect of left chela, outer face (Holotype). Left third pereopod, coloration pattern.
References. - Calcinus isabellae Poupin, 1997: 698 (type locality: Morane atoll, Tuamotu).
Calcinus isabellae - Asakura, 2002: 53 (type specimens and Mariana).
Calcinus imperialis - Wooster, 1984: 130 (Pagan & Guam; Marianas). - Poupin, 1996a: 14 (Society and Tuamotu, French Polynesia) [Not C. imperialis Whitelegge, 1901].
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 with longitudinal depression(s) (a large submedian depression).
Ambulatory legs (P2-P3). - Dactyl of P3 subequal to propodus or slightly shorter (0.60.8). Distal pilosity of P3 dense, forming a brush of setae.
Armament of telson. - Left lobe of telson with a single spine. Right lobe with a single spine.
Coloration. - Shield white or cream. Ocular peduncle multicolored without narrow ring close to cornea. Detailed coloration of ocular peduncle: dark narrow ring proximally, basal 2/3 green-olive, distal 1/3 white. Distal antennular peduncle dark green (basal segment orcher; flagella green). Distal antennal peduncle green (basal segment green with yellow tinges at tip of spines; flagellum yellow). Chela with red spot at base of dactyl (background color green olive turning to white distally; carpus of cheliped green-olive, with white spots on tubercles). Ambulatory legs (P2 & P3) with ring(s) (white, black, and red).
Habitat. - Facultative associates of corals (e.g. Pocillopora, Acropora), shallow-waters.
Geographic distribution. - Mariana Islands; French Polynesia (Society and Tuamotu Islands). Indo-West Pacific.
Remarks. - Affiliated to Calcinus imperialis with similar color pattern: red spots at bases of dactyls of chelae and similar rings on ambulatory legs.