Hypocolpus haanii Rathbun, 1909

Mendoza, Jose Christopher E. & Ng, Peter K. L., 2010, The Euxanthine Crabs (Crustacea: Brachyura: Xanthidae) Of The Philippines, Raffles Bulletin of Zoology 58 (1), pp. 57-74 : 64-65

Hypocolpus haanii Rathbun, 1909

( Figs. 2A , 3C, D )

Hypocolpus granulatus – Buitendijk, 1960: 308.

Material examined. – 1 male, 25.1 × 17.7 mm (NMCR-27338), Balicasag Is., 50–200 m, coll. local fishermen with tangle nets, 02 Mar.2004; 1 male, 49.5 × 34.5 mm (NMCR-27339), Balicasag Is., 50–200 m, coll. local fishermen with tangle nets, 29 May 2004; 1 male, 6.2 × 4.2 mm ( ZRC 2008.1380 ), Stn. B 5, reef slope with overhangs, 4 m, 9°35.2'N 123°50.4'E, Biking, Panglao Is., coll. PANGLAO 2004 Marine Biodiversity Project, 02 Jun.2004 ; 1 male, 4.0 × 2.9 mm ( ZRC 2008.1381 ), Stn. B 6, coral patches, 12–14 m, 9°31.1'N 123°41.3'E, Black Forest , Balicasag Is., coll. PANGLAO 2004 Marine Biodiversity Project, 04 Jun.2004 ; 1 male, 4.1 × 3.1 mm, 2 females, 11.5 × 7.9 mm to 11.8 × 8.0 mm ( ZRC 2008.1382 ), Stn. B 8, subtidal reef platform, 3 m, 9°37.1'N 123°46.1'E, Napaling, Panglao Is., coll. PANGLAO 2004 Marine Biodiversity Project, 07 Jun.2004 ; 1 male, 11.5 × 8.0 mm ( ZRC 2008.1383 ), Stn. B 11, coral rubble, 2–4 m, 9°29.4'N 123°56.0'E, Pamilacan Is., coll. PANGLAO 2004 Marine Biodiversity Project, 11 Jun.2004 ; 1 male, 7.6 × 5.4 mm, 1 female, 7.1 × 4.9 mm ( ZRC 2008.1384 ), Stn. B 19, reef slope with cave, 17 m, 9°29.4'N 123°56.0'E, Pamilacan Is., coll. PANGLAO 2004 Marine Biodiversity Project, 21 Jun.2004 ; 1 male, 5.2 × 3.7 mm ( ZRC 2008.1385 ), Stn. B 22, rubble on mixed bottom, 15–20 m, 9°29.4'N 123°56.0'E, Pamilacan Is., coll. PANGLAO 2004 Marine Biodiversity Project, 24 Jun.2004 ; 1 male, 8.2 × 5.8 mm ( ZRC 2008.1386 ), Stn. B 24, floor of cave, 38 m, 9°29.4'N 123°56.0'E, Pamilacan Is., coll. PANGLAO 2004 Marine Biodiversity Project, 25 Jun.2004 ; 1 female, 17.6 × 11.6 mm ( ZRC 2008.1387 ), Stn. B 37, floor of cave, with corals and sponges, 19–20 m, 9°30.9'N 123°40.8'E, Balicasag Is., coll. PANGLAO 2004 Marine Biodiversity Project, 02 Jul.2004 ; 1 male, 6.1 × 4.1 mm ( ZRC 2008.1388 ), Stn. S 10, coral plateau with fine sand covering rocks, 6–14 m, 9°29.4'N 123°56.0'E, Pamilacan Is., coll. PANGLAO 2004 Marine Biodiversity Project, 11 Jun.2004 .

Remarks. – This is one of the most common euxanthine species to be collected from the Bohol Sea. The live colouration of the juvenile form is noted here: the carapace is basically rosy pink, with splotches of red or purple; the chelipeds are similarly hued but lighter and more mottled, the inner surface of the palm and carpus is white, and the fingers are a light brown, becoming even lighter at the tips; the ambulatory legs are a mottled brown and white. Many of the specimens collected are juveniles, and these were collected by coral brushing or vacuum suctioning. All of the adults were collected by tangle net. Hypocolpus haanii has been reported previously from Japan and Thailand (Guinot- Dumortier, 1960).

Figures

Fig. 2. Live colouration of euxanthine crabs from the Philippines: A, Hypocolpus haanii Rathbun, 1909, male juv., (11.5 × 8.0 mm) (B11, Pamilacan Is., ZRC 2008.1383); B, Ladomedaeus fungillus Manuel-Santos & Ng, 2007, male juv. (9.7 × 7.0 mm) (CP2708, ZRC 2008.1389); C, Miersiella cavifrons Takeda, 1989, male (9.8 × 6.6 mm) (L36, Panglao Is., ZRC 2008.1391); D, Paramedaeus globosus Serène & Vadon, 1981, male (6.0 × 4.6 mm) (T36, Cervera Shoal, MNHN-B31891); E, Paramedaeus simplex (A. Milne-Edwards, 1873), female (9.7 × 6.8 mm) (S7, Panglao Is., NMCR-27356); F, Paraxanthodes obtusidens (Sakai, 1965), male (18.6 × 13.0 mm) (CP2747, ZRC 2008.1410).

Fig. 3. Hypocolpus abbotti (Rathbun, 1894), male, (41.6 by 28.7 mm) (Balicasag Is., MNHN-B31888): A, dorsal view; B, fronto-lateral view of subhepatic cavity; Hypocolpus haanii Rathbun, 1909, male (49.5 × 34.5 mm) (Balicasag Is., NMCR-27339); C, dorsal view; D, fronto-lateral view of subhepatic cavity; Hypocolpus kurodai Takeda, 1980, male (21.0 × 13.5 mm) (Marinduque, NMCR-6609); E, dorsal view; F, fronto-lateral view of subhepatic cavity.