Calcinus areolatus Rahayu & Forest, 1999
Illustrations. - Specimen from Japan (CBM-ZC 6409), after Asakura (2002). Copyright A. Asakura. Ocular peduncle, color pattern. Adapted after Rahayu & Forest, 1999. Left third pereopod, color pattern. Adapted from Rahayu & Forest, 1999.
References. - Calcinus areolatus Rahayu & Forest, 1999: 468 (type locality, Indonesia).
Calcinus areolatus - Asakura, 2002: 11 (Japan).
Calcinus morgani - Kato & Okuno, 2001: 71 (Japan) [Not C. morgani Rahayu & Forest, 1999].
Shield and cephalic appendages. - Ocular scale with a single terminal spine. Small species, shield length does not exceed 23 mm (within the 12 specimens examined by Rahayu & Forest, maximum shield length is only 2.0 mm).
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 (this brush sometime unclear, but distal setation of P3 always greater than on P2).
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 with narrow ring close to cornea. Detailed coloration of ocular peduncle: proximal 3/4 dark brown, distal 1/4 blue, with paler ring close to cornea. Distal antennular peduncle yellow-orange (basal segments and proximal half of ultimate segment brown). Distal antennal peduncle brown (first two basal segments orange). Chela uniformly colored, often grading to paler distally (dark brown, turning to white; tubercules white; fingers with few small brown patches; carpus of cheliped dark brown, tubercles white). Ambulatory legs (P2 & P3) with spots (brown dark spots on a brown background turning to white on distal propodi and dactyls).
Habitat. - Intertidal rocky shores, shallow-waters (up to 3 m).
Geographic distribution. - Indonesia. Indo-West Pacific.
Remarks. - Calcinus areolatus seems to be a small species, none of the 12 specimens examined for its description being greater than 2.0 mm (shield length). Specimens from Japan, in Asakura (2002) are 2.55 and 2.75 mm. No mature female (ovigerous) has been observed in the genus.