Mysmena biangulata (Lin & Li, 2008)

Zhang, Qiuqiu, Li, Shuqiang & Lin, Yucheng, 2022, Taxonomic study on Mysmenidae spiders (Mysmenidae, Araneae) from Xishuangbanna of Yunnan, China, ZooKeys 1124, pp. 59-108 : 59

Mysmena biangulata (Lin & Li, 2008)

Figs 19 , 20

Calodipoena biangulata Lin and Li 2008: 499, figs 8A-E, 9A-H (♂♀).

Mysmena biangulata Lopardo and Hormiga 2015: 784.

Type material.

Holotype ♂ (IZCAS) and paratypes 10♂ 7♀ (IZCAS), China: Yunnan, Mengla, XTBG, secondary tropical seasonal rainforest (21.924°N, 101.274°E; 598 ± 17 m), by pitfall trapping, 22.VII.2007, G. Zheng leg. Examined.

Other material examined.

19♂ 27♀ (IZCAS), China: Yunnan, Mengla, Menglun, XTBG, Rubber-Tea plantation (about 20 yr.) (21.908°N, 101.266°E; 569 ± 11 m), by pitfall trapping, 16-31.I.2007, G. Zheng leg. ; 3♂ 10♀ (NHMSU), China: Yunnan, Mengla, Menglun , XTBG, Paramichelia baillonii plantation (about 20 yr.) (21.897°N, 101.285°E; 613 ± 11 m), by pitfall trapping, 16-24.X.2006, G. Zheng leg.

Diagnosis.

This species can be distinguished from other species except for M. awari (Baert, 1984), M. marijkeae (Baert, 1982), M. vangoethemi (Baert, 1982) and M. nubiai (Baert, 1984) by the elongate palpal bulbus, the cymbial process (CyP) juxtaposed with cymbial conductor (CyC) and both curved (cf. Fig. 20B , figs 11-12 in Baert 1982, and figs 9-10, 12-13 in Baert 1984), and the twisted, widely spaced spermathecae (cf. Fig. 20E , fig. 9H in Lin and Li 2008). Mysmena biangulata distinguished from those four species by CyP near same length as CyC at M. biangulata , shorter in four species (Fig. 20A, B vs. fig. 133D-F, Lopardo & Hormiga, 2015, 676, figs 11, 12, Baert, 1982, 306, figs 9-11, Baert, 1984b, 231). One CyP in M. biangulata , two processes in M. awari (fig. 133D-E in Lopardo & Hormiga, 2015), M. vangoethemi (fig. 12 in Baert, 1982) and M. nubiai (figs 9-11, in Baert, 1984), three processes in M. marijkeae (fig. 11 in Baert 1982). Females can be distinguished by the coiled spermathecae with modified glandulous sac and the directly opposite basal partition of copulatory ducts (Fig. 20D, E ).

Description.

See Fig. 19A-F and Lin and Li 2008: 499.

Male palp (Fig. 20A, B ): light-yellow; tibia big, about 2/3 volume of the bulb, cup-shaped; Except for retrolateral region, a row of long setae almost encircling the distal brim (Fig. 20B ). Cymbium nearly transparent; the cymbial conductor lateral bending, parallel to the cymbial process; the cymbial fold long and sclerotized, bears a row of ordered setae (Fig. 20A, B ); Embolus threadlike, coiled into 2 loops in tegulum. Spermatic ducts can be seen through tegulum (Fig. 20A, B ).

Epigyne (Fig. 20C-E ). The scape stubby, surface smooth (Fig. 20C-E ). Spermathecae small, the diameter same as the copulatory ducts (Fig. 20D ). Fertilization ducts and copulatory ducts slightly sclerotized, coiling around each other; the fertilization ducts opening to both edges of epigyne; anterior copulatory ducts sclerotized, flow-shaped; two openings converge toward the centre of epigyne (Fig. 20D, E ).

Distribution.

Southwestern China (Yunnan).

Figures

Figure 19. Mysmena biangulata A-C male habitus D-F female habitus A, E dorsal B, F ventral C, D lateral. Abbreviations: AP = abdominal protuberance; FS = femoral spot; MC = Metatarsal clasping spine. Scale bars: 0.50 mm.

Figure 20. Mysmena biangulata A, B male palp C epigyne D, E vulva. A prolateral B retrolateral C, D ventral E dorsal. Abbreviations: CD = copulatory duct; Cy = cymbium; CyC = cymbial conductor; CyF = cymbial fold; CyFs = setae on cymbial fold; CyP = cymbial process; E = embolus; FD = fertilization duct; S = spermatheca; SD = spermatic duct; Sp = scape; Te = tegulum; Ti = palpal tibia. Scale bars: 0.20 mm (A, B); 0.10 mm (C-E).