Viaderiana longipes (A. Milne-Edwards, 1873 )

Viaderiana longipes (A. Milne-Edwards, 1873) View in CoL

[Jn: Kahmiiji-kebukagani]

( Fig. 1E View Fig )

Pilumnus longipes A. Milne-Edwards, 1873, p. 245 View in CoL , pl. 10 fig. 1. —De Man, 1888, p. 309. — Ng et al., 2008, p. 142 (in list).

Lithocheila quadrispinosa (Zehntner, 1894) : Sakai, 1976, p. 534 (English vol.), p. 329 (Japanese vol.), pl. 191 fig. 3. (fide Maenosono, 2020)

Viaderiana longipes View in CoL : Takeda & Manuel-Santos, 2003, p. 210 (in discussion). ʕ Maenosono, 2020, p. 29, figs. 2E–F, 3D, 10–11, 12K–M.

Material examined. ɹ Chichi-jima Is. —Oomura Beach (27°05′35′′N, 142°11′38′′E), Chichi-jima I., 12 m, 1 young ˁ (cb 5.2×cl 4.0 mm), NSMTCr 32405, 13-XI-2013, coll. by H. Komatsu; Ooiwa (27°07′06′′N, 142°10′19′′E), Nishi-jima I., 9 m, 1 ˁ (cb 6.0×cl 5.1 mm), NSMT-Cr 32406, 27-VI-2014, coll. by H. Komatsu.

Haha-jima Is. —Shihon-iwa South (26°38′49′′N, 142°08′36′E), Haha-jima I., 1 ˁ (cb 10.7×cl 8.2 mm), NSMT-Cr 32407, 3-VII-2015, coll. by H. Komatsu; Hirane (26°34′08′′N, 142°12′49′′E), Haha-jima I., 20–25 m, 1 ˁ (cb 5.1×cl 4.5 mm), NSMT-Cr 32408, 14-VII-2016, coll. by H. Komatsu.

Remarks. ɹ This species has been well studied by Maenosono (2020) on the specimens from the Ryukyu Islands, and distinguished from the related species, especially V. incerta ( Takeda and Miyake, 1969) . Both species are typical as the Viaderiana species, sharing the more or less camouflaged color without special spots, two strong and one vestigial anterolateral teeth, and the long ambulatory legs. In the present species ( Fig. 1E View Fig ), however, the frontal margin is separated into two strongly convex lobes by a median distinct notch (vs each lobe with nearly straight margin in V. incerta ), and each merus of the first three ambulatory legs is armed with two or three spines on the upper margin, with one terminal spine (vs terminal spine usually absent in V. incerta ). The armature of the ambulatory legs may be variable in both species, as stated by Maenosono (2020).

In the original description of Pilumnus comatus Ng, Dai and Yang, 1997 , some differences between P. comatus and P. longipes (now, Viaderiana longipes ) were mentioned based on the examination of the type specimen of P. longipes . It was noted for P. longipes that each frontal lobe is more pronounced, the outer margin and dorsal surface of the cheliped carpus have distinct spines, and the ambulatory meri have one or two distinct spines, and the G1 distal part is strongly recurved.

Distribution. ɹ New Caledonia; Pulo Edam, Malay Peninsula; the Ryukyu Islands.