Raoulia fortis Ng and Rahayu, 2014

Raoulia fortis Ng and Rahayu, 2014 View in CoL [NJn: Raouru-gani]

( Fig. 1A–D View Fig )

Typhlocarinodes piroculatus Rathbun : Balss, 1938, p. 73. — Miyake, 1939, p. 220 (in list).

Raoulia fortis Ng & Rahayu, 2014, p. 31 View in CoL View Cited Treatment , figs. 1G–H, 5F, 6C, 20–21, 41A.

Material examined. ɹ Chichi-jima Is. —Tsuri-hama, Chichi-jima I., 1 ˁ (cb 10.2×cl 8.2 mm), NSMT-Cr 32390, 11-VII-2009, coll. by H. Saito.

Haha-jima Is. —Wakihama (26°38′10′′N, 142°09′29′′E), Haha-jima I., 1 ˂ (cb 7.4×cl 5.5 mm), NSMT-Cr 32391, 7-VII-2015, coll. by H. Komatsu.

Remarks. ɹ Ng and Rahayu (2014) revised the family Acidopsidae and recognized two subfamilies, Acidopsinae with three genera and Raouliinae with four genera, preparing the keys to all the genera and species. The present specimens are referred to the Raouliinae , in which the male genital opening is coxo-sternal, the basal antennal article is short and distinctly wider than long, and the female vulvae are arranged submedially on the sixth thoracic sternite. The subfamily Raouliinae contains four genera, Raoulia Ng, 1987 , Typhlocarcinodes Alcock, 1900 , Caecopilumnus Borradaile, 1902 , and Thecoplax Ng and Rahayu, 2014, all from the Indo-West Pacific.

The present specimens ( Fig. 1A–D View Fig ) are referred to Raoulia of the four genera, and R. fortis of five species — R. piroculata ( Rathbun, 1911) , R. limosa Ng, 1987 , R. galea Ng and Rahayu, 2014 , R. fortis Ng and Rahayu, 2014 , and R. calva Ng and Rahayu, 2014 . All of these species were elaborately described and distinguished by Ng and Rahayu (2014), with many photographs and line drawings. The most characteristic for this species is the third maxilliped merus having the rounded anterolateral margin and the hemispherically bulged surface ( Fig. 1B View Fig ). The palm outer surface is smooth, with a longitudinal submarginal groove along distal half of the lower part extending on to two-thirds of the immovable finger ( Fig. 1D View Fig ). The G1 is, as illustrated and explained in the original description, only gently curving with small spinules on the subdistal part.

Distribution. Aranuka, Gilbert Islands (= Kiribati); East of Aoré I., Espiritu Santo, Vanuatu, 12 m. New to Japanese waters.