Paraxanthodes obtusidens (Sakai, 1965)

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 : 70

Paraxanthodes obtusidens (Sakai, 1965)

( Figs. 2F , 4E, F )

Material examined. – 1 male, 31.5 × 22.2 mm, 1 female, 30.1 × 20.3 mm (NMCR-27357), Balicasag Is., 50–200 m, coll. local fishermen with tangle nets, purch. P. K. L. Ng, 25 Oct.2003; 1 male, 18.6 × 13.0 mm ( ZRC 2008.1410 ), Stn. CP 2747, 118– 124 m, 15°55.53'N 121°42.12'E, off the eastern coast of Luzon, coll. MV DA-BFAR, AURORA 2007 Deep-Sea Cruise , 2 Jun.2007 .

Remarks. – This species was first assigned to Micropanope by Sakai (1965), but was later transferred to a new genus, Paraxanthodes , by Guinot (1967b), wherein she designated it as the type species. The Philippine material agrees well with the illustrations provided by Sakai (1965a: 103, Figs. 2c , 3e, f ) and Guinot (1967b: 723–726, Figs. 51a, b, 59). The live colouration is as follows; the carapace and chelipeds and ambulatory legs are deep reddish-orange, with lighter areas of yellowish-white immediately surrounding the third and fourth anterolateral teeth. There are small patches of white particularly in the cardiac region and in the grooves between the bases of 2M and 3M. The fingers of the chela are dark brown all throughout their length, but not extending to the palm. Other than the type locality (Sagami Bay, Japan), it has also been recorded from Muroto-zaki, Kii Nagashima, Kii Minabe, and Tosa Bay, all in Japan ( Yokoya, 1933; Sakai, 1965b, 1976), and also from the South China Sea ( Guinot, 1967b). This is the first record of this species in the Philippines.

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. 4. Epistocavea mururoa Davie, 1993, male (33.2 × 23.5 mm) (L36, ZRC 2008.1371): A, dorsal view; B, frontal view; Miersiella haswelli (Miers, 1886), male (7.4 × 5.5 mm) (CP2343, Pamilacan Is., ZRC 2008.1400); C, dorsal view; D, ventral view; Paraxanthodes obtusidens (Sakai, 1965), female (30.1 × 20.3 mm) (Balicasag Is., NMCR-27357); E, dorsal view; F, frontal view; G, Medaeops granulosus (Haswell, 1882), female (12.5 × 9.0 mm) (Iloilo, NMCR-9705); H, Paraxanthodes cumatodes (MacGilchrist, 1905), male (5.7 × 4.1 mm) (T1, Panglao Is., ZRC 2008.1409).

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.