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 (0.6–0.8). 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.
