Octonoba xihua Barrion, Barrion-Dupo & Heong

Alberto T. Barrion, Aimee Lynn A. Barrion-Dupo, Josie Lynn A. Catindig, Sylvia C. Villareal, Ducheng Cai, Qianhua Yuan & Kong Luen Heong, 2016, NEW SPECIES OF SPIDERS (ARANEAE) FROM HAINAN ISLAND, CHINA, UPLB Museum Publications in Natural History 3, pp. 1-103 : 44

Octonoba xihua Barrion, Barrion-Dupo & Heong , new species [ Figure 50 A-D]

MALE. Holotype male, total length 9.00 mm. Cephalothorax length 8.9 mm, width 0.83 mm. Abdomen length 1.57 mm, width 0.77 mm.

Carapace. Rounded, yellow with grayish to black margins, median area with a gray longitudinal and Y-band. Chelicerae longer than wide, basal half grayish yellow and apical half yellow. Pedipalps yellow with gray longitudinal bands on both lateral sides of femur, patella and retrolateral side of tibia and midventral side of cymbium. Maxillae yellow, slightly longer than wide, narrow basally and broad apically. Labium grayish yellow and moderately convex apical margin plain yellow. Sternum grayish yellow with a dark yellow spot opposite coxa I, brownish lateral margins and truncated posterior end.

Eyes. In two rows of four. AER strongly recurved and shorter than slightly recurved to straight PER (0.44: 0.49 mm). Eye diameter (mm): PLE (0.09)> PME=ALE (0.07)> AME (0.06). AME clos- er to ALE than to each other. PE equally spaced. PLE and ALE on a small tubercle. Clypeus height 1.7x AME diameter.

Legs. Slender, yellow with longitudinal bands on femora I-IV and alternating gray and yellow bands on tibiae I-IV and metatarsi I-IV. Venter of short tarsus I with at least six thin spines. Leg formula 1423.

Abdomen. Short and tail-like, yellowish medially with two longitudinal rows of interrupted white bands and black bands laterally. Anterior abdomen cleft, median apical one-third bears a pair of small tubercle and a larger spine at midlength where abdomen narrows posteriorly. Venter whitish yellow with a median pale gray longitudinal band and an inverted U-shaped white band anterior of epigastric furrow.

Palpal organ bears a brownish plate-like median apophysis spur with a tube-like and cleft apical tip. Tip of embolus directed to apex of cymbium. Venter of cymbium with a subapical spine. Tibia with a black T-band retrolaterally and bears one long lateral trichobothrium.

FEMALE. Unknown.

Material Examined. Holotype male (coll. no. Dac 2011-2), CHINA, Hainan Island, Dacheng, Xihua village, 6 April 2011, ATBarrion, JLACatindig and SCVillareal.

Diagnostic Features. This species is close to the facies of Octonoba sinensis (Simon, 1880) but differs from the latter in the following features: (1) tail-like abdomen with three spines dorsally, (2) cleft anterior abdominal margin, (3) presence of a single trichobothrium in palpal tibia, (4) shape of median apophysis spur, (5) presence of a single spine in the ventrosubapical area of cymbium, and (6) leg measurements.

Etymology. Named after the type locality.