Calcinus explorator Boone, 1930
Illustrations. - • Calcinus explorator Boone, 1932. Photo transmitted by M.K. Wicksten. • Calcinus explorator Boone, 1932. Type from original description. After Boone (1932: 21, fig. 6).
References. - Calcinus explorator Boone, 1932: 21 (type locality, Galapagos Islands).
Calcinus explorator - Hendrick & Harvey, 1999: 368 (additional references and distribution: Tres Marias Island and Mita Point, Nayarit, Gulf of California, and Chamela Bay, Jalisco, Mexico; Clarion, Socorro and Galapagos Islands). - Boschi, 2000: 71 (Checklist; Panamic province and Galapagos).
Shield and cephalic appendages. - Ocular scale with a single terminal spine. Species of normal size, i.e. shield length often greater than 2–3 mm.
Chelipeds (P1). - Upper margin of right chela smooth. Outer face of left palm regularly convex.
Ambulatory legs (P2-P3). - Dorsolateral margins of P3 propodi rounded. Distal pilosity of P3 weak, similar to distal P2.
Armament of telson. - Left lobe of telson with a single spine. Right lobe with a single spine.
Coloration. - Ocular peduncle uniformly colored (to be confirmed). Chela uniformly colored, often grading to paler distally (observed only on Paris MNHN spp., in alcohol). Ambulatory legs (P2 & P3) with ring(s) (on Paris MNHN spp. in alcohol; ambulatory legs dark, dactyls paler with median dark ring).
Habitat. - Intertidal rocky shores.
Geographic distribution. - Clipperton, Galapagos, Gulf of California, Mexico. East Pacific.
Remarks. - See Hendrick & Harvey (1999: 368) for discussion about the possible synonymy between Calcinus explorator Boone, 1932 and C. obscurus Stimpson, 1859. Material examined by J. Poupin in MNHN collections: Clipperton atoll, 4 males shield length 6.0–7.6 mm, coll. Service de Santé des Armées (MNHN Pg 564); 1 male 6.9 mm, coll. Le Chuiton, 1966 (MNHN Pg 651).
