Ischnothyreus narutomii (Nakatsudi, 1942)

Tong, Yanfeng & Li, Shuqiang, 2008, The Oonopid Spiders (Araneae: Oonopidae) From Hainan Island, China, Raffles Bulletin of Zoology 56 (1), pp. 55-66 : 60-61

Ischnothyreus narutomii (Nakatsudi, 1942)

( Fig. 5A–D )

Material examined. – 2 males ( IZCAS), Baoyou Cave (19 ° 06'N 109 ° 01'E), Baoyou Village , Qicha Town, Changjiang County, Hainan Island, China, coll. Y. Song, X. Han, G. Deng and Y. Tong, 3 Apr.2005 .

Diagnosis. – The male of this species (female unexamined) can be distinguished from the other congeners by the distinctly lobes on apical part of embolus, connected by developed membranous outgrowths.

Redescription. – Male. Body length 1.88; carapace 0.97 length, 0.74 width; abdomen 0.89 length, 0.52 width. Sides of carapace yellowish brown to gray, dorsally yellow, chelicerae, sternum, legs, dorsal and ventral scutum light yellow. Carapace with pair of dark brown, egg-shaped patches behind eyes; dorsally with three rows of short hairs. Eyes six in two rows, quite compactly arranged; ALE separated only by a line; posterior eyes in a straight row, touching each other. Base of cheliceral fang unmodified. Labium wider than long; endites with pointed tip. Leg I: femur with 2 prolateral and 1 small retrolateral spine, patella spineless, tibia with 4 pairs, metatarsus with 2 pairs of very long ventral spines. Leg II is similar to leg I except femur with only one prolateral spine. Measurements of legs: I 2.97 (0.85, 0.37, 0.83, 0.64, 0.28); II 3.19 (0.91, 0.39, 0.82, 0.74, 0.33); III 2.65 (0.79, 0.35, 0.56, 0.67, 0.28); IV 3.73 (1.07, 0.50, 0.87, 0.93, 0.36). Leg formula: 4> 2> 1> 3. Abdomen oval-shaped, dorsal scutum about three-fourths abdominal length. Bulbus of palp elongated, gradually tapering apically, obtusely bent before apex. Embolic part divided into distinct lobes, connected by some membranous outgrowths.

Female. Unexamined.

Distribution. – China (new to Hainan, Taiwan), Japan.

THE RAFFLES BULLETIN OF ZOOLOGY 2008

Figures

Fig. 5. Ischnothyreus narutomii (Nakatsudi, 1942): A, male, dorsal view; B, left male palpal bulb, apical view; C, left male palp, prolateral view; D, left male palp, retrolateral view. Scales: A = 0.5 mm, B-D = 0.05 mm.