Orchestina multipunctata, Liu, Keke, Xiao, Yonghong & Xu, Xiang, 2016

Liu, Keke, Xiao, Yonghong & Xu, Xiang, 2016, On three new Orchestina species (Araneae: Oonopidae) described from China, Zootaxa 4121 (4), pp. 431-446 : 441-444

Orchestina multipunctata sp. nov.

Figs 8−11 .

Type material. Holotype male: China, Jiangxi Province: Ji’an City, Qingyuan District, Jinggangshan University, bamboo forest, 27.1122°N, 114.1209°E, 73m, 30.XII.2013, Zhiwu Chen, Keke Liu and Jihao Zhang leg. (OON 16).

Etymology. The specific name is a Latin adjective, meaning “multipunctate” and referring to the two ventral group of three conspicuous spots on the posterior part of the abdomen.

Diagnosis. Male of the new species resemble to O. dentifera Simon, 1893 in having the strongly swollen palpal tibia and the pear-shaped bulbs with slender embolus, but can be clearly distinguished by the absence of cheliceral thoot like extension (see Dalmas 1916, P. 232) and the two groups of abdominal ventral spots ( Figs 8B , 10C ). However it seems more difficult to differenciate with O. pilifera Dalmas, 1916 which appears to have a very similar palp, with similar proportion (see Dalmas 1916, P.233 fig. 22). They can be separated from each other only by different shape palpal femur and endites, the latter with non-modified palpal femur and endites ( Dalmas 1916).

Description. Male. Habitus as in Figs 8A −C . Total length 1.52. Carapace ( Figs 8D, E ), yellow, length 0.67, width 0.57, slightly elongate oval in dorsal view (CW/CL ≈ 0.85), pars cephalica strongly elevated in lateral view, anteriorly narrowed to 0.5 times its maximum width, with net-shaped pattern formed by tiny dark spots on surface. Eyes ( Figs 8A, C −E ): PME circular, touching; diameters: ALE 0.07, PME 0.09, PLE 0.07, PME 1.3 times ALE and PLE; ALE −PME touching, PLE −PME separated from less than PME radius. Clypeus ( Figs 8D, E ) margin unmodified, slightly curved downwards in frontal view, with two groups of three setae on lateral rounded corners. Sternum ( Figs 8G , 9A ) anterior margin unmodified, longer than wide, shield shaped, yellow-brown, surface smooth, setae sparse and scattered, with tiny dark spots along margin forming small darker band. Mouthparts ( Figs 8D −F , 9A −C , 10A, B ): Chelicerae yellow, straight, with u-shaped space between base of chelicerae, with two groups of three strong and converging setae on the distal part, base of fang with two groups of two setae finely divided in distal three fourths in ventral view ( Figs 8D, E , 9A −C , 10A ); labium triangular, pale yellow, with two pairs of large symmetric flattened, leaf shaped setae (covering 1/3 labium) and a small flattened setae near the centre of posterior margin, anterior margin with two small conical extension ( Figs 9A, B , 10B ); endites almost parallel, with sharpen hook-shaped distal extension pointing anteriorly towards the chelicerae, with strong setae in the anterior lateral and median part, serrula absent ( Figs 8F , 9A −C , 10B ). Abdomen ( Figs 8A, B , 10C ) oval, yellow, length 0.81, width 0.61, strongly elongated oval in dorsal view (AW/AL ≈ 0.75), without dorsal herringbone band; posterior part ventrally with two groups of three large, dark circular spots; pedicel tube short, unmodified. Book lung small, round. Spinnerets small, setae abundant on each spigot, posterior spinnerets longer than anterior. Legs ( Figs 8A −C ) without color pattern; femur IV thickened, wider than femora I −III. Genitalia ( Figs 8H, I , 9B, D , 10D −F ): Palp pale yellow, femur with conspicuous medial enlargement and distally abruptly narrowed; patella shorter than femur, attached to tibia sub-proximally; tibia strongly enlarged, ovoid (W/L ≈ 0.68), more than twice as wide as femur, with numerous setae dorsally and prolaterally,; cymbium oval in lateral view, setae present on the surface; bulb pale yellow, pear-shaped, less than 2 times as long as its maximum width, tapering apically; embolus slender, dark, tube-shaped, with proximal part strongly curved, forming an angle of about 120° with axis of bulb, pointing inward, longer than half length of bulb.

Female: Unknown.

Distribution. Known only from Jiangxi Province ( Fig. 11 ).

Figures

FIGURE 11. Collection localities for Orchestina apiculata sp. nov., O. bialata sp. nov. and O. multipunctata sp. nov. in China.

FIGURES 8 A − I. Orchestina multipunctata sp. nov., male holotype. A. Habitus, dorsal view; B. As previous, ventral view, the arrow shows the two groups of abdominal ventral spots in front of spinnerets; C. As previous, lateral view; D. Prosoma, frontal view, the white arrow shows the u-shaped space between at base of chelicerae and the black arrow shows the distal group of three long converging setae; E. As previous, dorsal view; F. Mouthparts, ventral view; G. Sternum, ventral view; H. Left palp, prolateral view, the arrow shows the angle about 120 ° between embolus and the axis of bulb; I. As previous, retrolateral view. Scale bars: A − C, 0.2 mm; D − I, 0.1 mm.

FIGURES 9 A − D. Orchestina multipunctata sp. nov., SEMs of male holotype. A. Prosoma, ventral view, black arrows show two pairs of large symmetric flattened setae, the white arrow shows a small, central, flattened setae near posterior margin; B. Mouthparts, ventral view, the anterior black arrows show two pairs of large symmetric flattened, leaf shaped setae, the white arrow shows a small, central, flattened setae near posterior margin; C. Chelicerae, ventral view, the white arrows show the two groups of strong and converging setae on the distal part, the black arrows show the endites with the sharpen hook-shaped distal extension pointing anteriorly towards the chelicerae; D. Left palp, retrolateral view, the arrow shows the 120 ° angle between embolus and the axis of bulb. Scale bars: A, 0.1 mm; B, 20 µm; C, 10 µm; D, 30 µm ..

FIGURES 10 A − F. Orchestina multipunctata sp. nov., male holotype. A. Chelicerae, frontal view, the anterior arrow shows the u-shaped space at base of chelicerae, the posterior arrow shows the two distal groups of three strong and converging setae; B. Mouthparts, ventral view; C. Abdomen, ventral view, the arrows show the two posterior groups of three dark circular spots; D. Left palp, prolateral view; E. As previous, retrolateral view; F. As previous, frontal view. Scale bars: 0, 1 mm.