Urashima pustuloides ( Sakai, 1961 )

Takeda, Masatsune, Ohtsuchi, Naoya & Komatsu, Hironori, 2021, Crabs (Crustacea, Decapoda) from the Sea off East and Southeast Asia collected by the RV Hakuhō Maru (KH- 72 - 1 Cruise) 1. Sulu Sea and Sibutu Passage, Bulletin of the National Museum of Nature and Science. Series A, Zoology 47 (2), pp. 65-97 : 80-82

Urashima pustuloides ( Sakai, 1961)

( Fig. 11A–C )

Material examined. RV Hakuhō Maru KH-72-1 cruise, sta. 11 (Sulu Sea ; 08°12.7′N, 117°59.6′E – 08°11.8′N, 117°58.5′E; 285–306 m deep); 3 m beam trawl; 26 May, 1972; 1 ˁ ( CB 42.4 mm including lateral teeth; CL 35.7 mm in median line) , NSMT-Cr 28971.

Remarks. The male at hand is without doubt identified as Urashima pustuloies ( Sakai, 1961) which was described in detail by Sakai (1961 and 1976, as Randallia ), diagnosed briefly by Chen (1989) and Tan (1996) as Randallia , and studied deeply and designated as the type species of the new genus Urashima by Galil (2003). This species is comparatively large in the family Leucosiidae , having a nearly diamond-shaped carapace. The remarkable characters are noted and shown in Fig. 11A–C . The dorsal surface is separated into regions by the linear furrows and covered with the dispersed obtuse tubercles of variable sizes. The epibranchial tubercle at the anterolateral and posterolateral junction protrudes laterally and is bifid at the tip. The intestinal region is thick, more or less tuberculate as a whole, and tipped with a small tubercle. The male pleon narrows strongly toward the telson, the tip of which is distinctly bifid; the fused pleomere is armed with a sharp erect spine at the median part close to the telson. The color in life of an immature female was given by Richer de Forges and Ng (2020: Fig. 5H ).

Another congener is U. lamellidentata ( Wood-Mason, 1892) known from the Andaman and Maldive archipelagoes and finely illustrated by Kumar et al. (2013), being characteristic in having the lamellate crest on the carapace anterolateral margin and also lamellate, rounded teeth on the carapace posterior margin.

Distribution. From Japan to Australia through East and Southeast Asian waters ( Galil and Ng, 2015); 85–839 m deep. For records from the Philippines, see Chen (1989), Tan (1996), Galil (2003), Komatsu et al. (2005), and Galil and Ng (2007).

Figures

Fig. 11. A–C: Urashima pustuloides (Sakai, 1961), male (NSMT-Cr 28971. CB 42.4mm including lateral teeth; CL 35.7mm in median line). Habitus in dorsal view (A), carapace in frontal view (B), and pleon (C). D: Paromolopsis boasi Wood-Mason, 1891, female (NSMT-Cr 28968. CB 32.0mm; CL 35.3mm including rostrum). Habitus in dorsal view.

Fig. 5. Dicranodromia foersteri Guinot, 1993, ovigerous female (NSMT-Cr 28966. CB 33.3mm; CL 37.0mm including rostrum). Front-orbital region with both chelipeds in ventral view (A), front-orbital region in dorsal view (B), right chela in inner view (C), right ambulatory legs in ventral view (D).