Chanea voluta, Lin, Yucheng & Li, Shuqiang, 2016

Lin, Yucheng & Li, Shuqiang, 2016, Mysmenidae, a spider family newly recorded from Tibet (Arachnida, Araneae), ZooKeys 549, pp. 51-69 : 53-55

Taxon classification Animalia Araneae Mysmenidae

Chanea voluta sp. n. Figs 1, 2, 3, 4, 10

Type material.

Holotype: male (IZCAS), CHINA: Tibet Autonomous Region, Nyingchi Prefecture, Bomi County, the Road of Bomi to Medog, near the village of Baqiong (29°52.194'N, 95°43.505'E; Elevation: 2880 m), 19 July 2013, L.H. Lin & X.Z. Cao leg. Paratypes: 1 male and 9 females (IZCAS), same data as holotype; 1 male and 3 females (IZCAS), Nyingchi County, Bayi Town, Biri Holy Mt., Winding hill roads (29°51.334'N, 94°47.941'E; Elevation: 2900), 11 July 2013, L.H. Lin leg.; 5 males (IZCAS), Nyingchi Prefecture, the south of Mainling County (29°12.316'N, 94°12.649'E; Elevation: 3060 m), 13 August 2013, L.H. Lin leg.; 5 females (IZCAS), Nyingchi Perfecture, Bomi County, near Zhamo Town (29°50.859'N, 95°45.861'E; Elevation: 2800 m), 17 July 2013, L.H. Lin leg.; 2 males (IZCAS), Nyingchi Prefec ture, 80 km of the road of Bomi to Medog (29°39.897'N, 95°29.963'E; Elevation: 2,140 m), 10 August 2013, X.Z. Cao leg., all types by manual sampling.

Etymology.

The specific name derived from the Latin word “volutus” = coiled, refers to the coiled embolus in male palp and the spiral fertilization duct in female vulva; adjective.

Diagnosis.

Male distinguished from Chanea suukyii Miller, Griswold & Yin, 2009 (see Miller et al. 2009: figs 49 A–C, 50 A–C, 51 A–B, 52 B–C) by the absence of paired macrosetea on the clypeus (Figs 1A, 1C), the longer paracymbium (Fig. 3 C–D), the wider palpal bulb (Fig. 2 A–C) and the variant embolic end (Fig. 3 A–B), and female by the presence of a long scape (Fig. 4 A–B), the larger spermatheca (Fig. 4 C–D), the membranous fertilization ducts encircling around the coiled copulatory ducts (Fig. 4 C–D).

Description.

Male (holotype). Somatic characters see Fig. 1 A–C. Coloration: Prosoma brown centrally, dark marginally. Chelicerae somber. Sternum yellow, with two pair of dark speckles on shoulder and posterior. Opisthosoma black dorsally, yellow ventrally and posteriorly. Legs pale yellow, each tibia and metatarsus yellow proximally, black distally.

Measurement: Total length 0.69. Prosoma 0.35 long, 0.36 wide, 0.38 high. Opisthosoma 0.45 long, 0.41 wide, 0.50 high. Clypeus 0.13 high. Sternum 0.25 long, 0.24 wide. Length of legs: I 1.27 (0.44, 0.16, 0.27, 0.19, 0.21); II 1.04 (0.33, 0.14, 0.21, 0.17, 0.19); III 0.80 (0.24, 0.11, 0.14, 0.13, 0.18); IV 0.93 (0.30, 0.12, 0.18, 0.15, 0.18).

Prosoma: Carapace near round. Cephalic pars elevated, slope forward and backward. Clypeal margin concave. Ocular area at apex. Eight eyes in two rows. AME black, others white. AME smallest, ALE largest. ALE>PME>PLE>AME. ALE and PLE contiguous. ARE precurved, PRE straight. Chelicerae small, shorter slightly than endites (Fig. 1C). Endites with tiny serrula. Labium semiround, fused to sternum. Sternum triangular, plump.

Legs: formula: I-II-IV-III. Leg I with a subdistal-ventral sclerotized femoral spot and a prolateral-submesial metatarsal clasping macroseta. Patellae I–IV with a dorsal seta distally. Tibiae I–IV with a dorsal seta proximally. Tibiae I and II with 3 trichobothria, but 4 on tibia III and IV. Metatarsi I–IV with only one trichobothrium.

Opisthosoma: globular dorsally, triangular laterally. Spinnerets grey, the anteriors larger than the posteriors. Colulus small, black, finger-shaped. Anal tubercle pale.

Palp (Figs 2 A–C, 3 A–D): Large, strongly sclerotized. Femur normal. Patella short, with a few setae. Tibia swollen, wider than long, askew cup-shaped, covered with marginal long setae dorsally and ventrally (Figs 2 A–B, 3D). Cymbium large, membranous, envelopes dorsal, retrolateral and ventral face of palpal bulb (Figs 2A, 3 C–D). Base of cymbium broad (Figs 2A, 3C). Cymbial groove distinct, and rugose (Fig. 3D). Paracymbium developed, finger-shaped, with long seta distally (Fig. 3 C–D). Internal margin of cymbium with an even row of setae on cymbial fold and a small cymbial lobe (Figs 2C, 3C). Conductor (or tegulum) smooth, compressed, rounded (Fig. 2 B–C). Embolus very long, coiling into ca. 6 loops, tightly encircles conductor and subtegu lum (Figs 2 A–C, 3 A–B). Embolar end slightly falcate, with tiny embolar apophysis (Fig. 3 A–B), hidden behind distal cymbial conductor (Fig. 2 A–B).

Female (one of paratypes). Somatic characters see Fig. 1 D–F. Coloration: Same as in male.

Measurement: Total length 0.87. Prosoma 0.31 long, 0.38 wide, 0.36 high. Opisthosoma 0.48 long, 0.52 wide, 0.60 high. Clypeus 0.07 high, distinctly lower than in male. Sternum 0.27 long, 0.25 wide. Length of legs: I 1.40 (0.45, 0.19, 0.29, 0.22, 0.25); II 1.20 (0.39, 0.16, 0.24, 0.19, 0.22); III 0.87 (0.26, 0.12, 0.15, 0.15, 0.19); IV 1.10 (0.36, 0.13, 0.22, 0.18, 0.21).

Prosoma: Carapace near pear-shaped. Cephalic pars lower than in male. Eyes pattern, chelicerae, endites and sternum as in male.

Legs: Chaetotaxy and number of trichobothria same as in male, except for leg I without metatarsal clasping macroseta. Sclerotized femoral spot present at leg I and II. Leg formula: I-II-IV-III.

Opisthosoma: Globose dorsally. Genitalia black. Spinnerets grey, the anteriors larger than the posteriors. Colulus small, black, long finger-shaped.

Vulva (Fig. 4 A–D): Epigynum weakly sclerotized, covered with short setae (Fig. 4 A–B), with a membranous scape posterior-mesially (Fig. 4C). Scape blunt, rugose. Spermathecae small and egg-shaped, strongly sclerotized, set far anterior from epigastric furrow (Fig. 4B). Membranous copulatory ducts wrapped long, spiral fertilization ducts (Fig. 4 C–D).

Distribution.

Known only from the type locality (Fig. 10).