Ischnothyreus campanaceus, Tong & Li, 2008

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

Ischnothyreus campanaceus , new species

( Fig. 1A–I )

Holotype. – Male ( IZCAS), Mountain Wuzhishan (18 ° 49'N 109 ° 39'E), Wuzhishan City, Hainan Island, China, coll. Y. Song, X. Han and Y. Tong, 16 Apr.2005.

Paratypes. – 2 males, 4 females ( IZCAS), same data as holotype .

Diagnosis. – The female of the new species is similar to I. linzhiensis Hu, 2001 (male unknown), but can be distinguished by the distinctly short and clearly winding tube in the middle line of the postepigastric scutum, and the distinctly long abdominal dorsal scutum; the male is similar to I. shillongensis Tikader, 1968 ( Brignoli, 1978) , but can be distinguished by the modifications on base of cheliceral fang and the outgrowths on apical part of embolus.

Description. – Male. Body length 1.47; carapace 0.80 length, 0.64 width; abdomen 0.70 length, 0.44 width. Sides of carapace yellowish-brown, dorsally yellow, scutum yellow, chelicerae, sternum, legs 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 slightly separated; posterior eyes in a straight row, touching each other. Base of fang with prominent processes; retromargin of fang furrow with a small tooth. 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 long ventral spines. Leg II spinatoin is similar to leg I except that femur with only one prolateral spine. Legs III and IV spineless. Measurements of legs: I 1.89 (0.56, 0.25, 0.47, 0.39, 0.22); II 1.83 (0.55, 0.24, 0.44, 0.39, 0.21); III 1.61 (0.49, 0.23, 0.26, 0.39, 0.24); IV 2.33 (0.67, 0.32, 0.49, 0.56, 0.29). Leg formula: 4> 1> 2> 3. Dorsal scutum of abdomen oval-shaped, covering nearly entirely abdominal length. Bulbus of palp elongated, gradually tapering apically, obtusely bent before apex. Embolic part not divided into distinct lobes, bearing some membranous outgrowths.

Female. Similar to male, but sides of carapace deeper in colour, without dorsal egg-shaped patches, base of fang unmodified, tip of endites truncated, dorsal scutum of abdomen shorter, about five-sixths abdominal length. Body length 1.52–1.57; carapace 0.70–0.78 length, 0.62–0.65 width; abdomen 0.85–0.94 length, 0.55–0.57 width. Measurements of legs: I 2.04 (0.61, 0.27, 0.54, 0.41, 0.21); II 2.04 (0.61, 0.27, 0.51, 0.43, 0.22); III 1.74 (0.49, 0.26, 0.35, 0.42, 0.22); IV 2.48 (0.69, 0.40, 0.54, 0.56, 0.29). Postepigastric scutum elongated hexagonal. A strongly winding tube visible through cuticle, originated from near the middle of epigastric sulcus and running posteriorly into the bell-shaped atrium. Internal course of tube explicit, same as the course when see from ventral view.

Etymology. – Specific name comes from the Latin “ campanaceus = bell-shaped”, in reference to the bell-shaped atrium in female.

Figures

Fig. 1. Ischnothyreus campanaceus, new species: A, male, dorsal view; B, female, dorsal view; C, carapace of female, lateral view; D, left male chelicera, posterior view; E, left male palpal bulb, apical view; F, ventral scutum of female, ventral view; G, H, I, left male palp in prolateral, dorsal and retrolateral view. Scales: A-C = 0.3 mm, D, F = 0.1 mm, E, G-I = 0.05 mm.