Mosu zhengi (Lin & Li, 2008) Zhang & Li & Lin, 2022

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

Mosu zhengi (Lin & Li, 2008) comb. nov.

Figs 13 , 14 , 15

Mysmena zhengi Lin and Li 2008: 490, figs 3A-E, 4A-H (♂♀).

Type material.

Holotype ♂ (IZCAS) and paratypes 6♂ 6♀, China: Yunnan, Mengla, Menglun, Primary tropical seasonal rainforest in XTBG (21.917°N, 101.275°E; 558 ± 17 m), by pitfall trapping, 22.VII.2007, G. Zheng leg. Examined.

Other material examined.

2♂ 3♀ (NHMSU), China: Yunnan, Mengla, Menglun , XTBG, Paramichelia baillonii plantation (about 20 yr.) (21.903°N, 101.282°E; 608 ± 11 m), by pitfall trapping, 7-11.VIII.2006, G. Zheng leg. ; 1♂ 1♀ (NHMSU), China: Yunnan, Mengla, Menglun , XTBG, Paramichelia baillonii plantation (about 20 yr.) (21.913°N, 101.267°E; 556 ± 11 m), by searching, 19-26.XI.2006, G. Zheng leg. ; 1♀ (IZCAS), China: Yunnan, Mengla, Menglun, XTBG, Rubber-Tea Plantation (about 20 yr.) (21.908°N, 101.266°E; 569 ± 11 m), by searching, 5-12.III.2007, G. Zheng leg.

Diagnosis.

This species is similar to M. tanjia Lin & Li, 2013, but can be distinguished by the male and female each with a short abdominal protuberance, the male with sclerotized femoral spot present on the surface of ventral femur I, the female with a femoral spot present on the surfaces of femur I and II (Fig. 13A-F vs. fig. 7A-F, Lin et al. 2013: 458). The palp can be distinguished by the cymbial tooth located in the cymbial center (Fig. 14B-C vs. figs 8A, C, 10C, Lin et al. 2013: 459). The female can be distinguished by the margin inferior to the epigyne incrassate, the reniform spermathecae, and the copulatory ducts without a curve and sclerotized parts above the spermathecae (Fig. 15A-C vs. figs 9A, B, 12A, B, Lin et al. 2013: 460, 463).

Description.

Male. Measurements: total length 1.45. Prosoma 0.55 long, 0.55 wide, 0.43 high. Abdomen 0.90 long, 0.75 wide, 0.75 high. Clypeus 0.08 high. Sternum 0.38 long, 0.35 wide. Length of legs: I 1.44 (0.43, 0.18, 0.38, 0.20, 0.25); II 1.19 (0.38, 0.13, 0.25, 0.18, 0.25); III 0.69 (0.25, 0.10, 0.10, 0.12, 0.12); IV 0.98 (0.33, 0.10, 0.30, 0.15, 0.10).

Somatic characters (Fig. 13A-C ). Coloration: prosoma deep yellow dorsally, yellow ventrally, ocular base black. Abdomen brown, with multiple yellow spots. Legs brown-yellow. Prosoma: carapace near round in dorsal and peak-shaped in lateral, marginally smooth. Cephalic area sharply elevated. Ocular region projecting, eight eyes in two rows. All eyes round, AER and PER recurved in dorsal view, ALE and PLE contiguous. Labium rectangle. Sternum scutiform, smooth surface. Legs: leg I with a mating clasper on metatarsus, a subdistal sclerotized femoral spot present at surface of ventral femur, the two spines on tibia. Legs covered with setae and bristles. Abdomen: near ladle-shaped in dorsum, covered with pale short setae.

Palp (Fig. 14A-D ): orange; tibia cup-shaped, except for retrolateral region, a row of long setae almost encircled the distal brim (Fig. 14C, D ). Cymbium transparent, nearly slant parallelogram, with a thorn-shaped cymbial tooth, cymbial fold long and sclerotized, bears a row of ordered setae (Fig. 14A, B ); Cymbial conductor wide, arc (Fig. 14B ). Paracymbium with long setae (Fig. 14B ). Bulb near round, embedded in a translucent membranous tegulum. Embolus long, coiled into 2 loops (Fig. 14A, C, D ).

Female. Measurements: total length 1.58. Prosoma 0.45 long, 0.45 wide, 0.30 high. Abdomen 1.13 long, 0.85 wide, 0.80 high. Clypeus 0.08 high. Sternum 0.38 long, 0.32 wide. Length of legs: I 1.10 (0.35, 0.10, 0.25, 0.20, 0.20); II 1.01 (0.25, 0.10, 0.24, 0.22, 0.20); III 0.76 (0.23, 0.08, 0.20, 0.15, 0.10); IV 0.92 (0.20, 0.15, 0.25, 0.16 0.16).

Somatic characters (Fig. 13D-F ). Coloration: prosoma deep yellow dorsally, yellow ventrally, ocular base black. Abdomen brown-yellow, with multiple white spots. Legs brown-yellow. Prosoma: carapace long, nearly pear-shaped. Cephalic part lower than in male, flatted on top. Eight eyes in three rows. AER and PER straight in dorsal view. Chelicerae, endites as in male, labium triangle, and sternum scutiform. Legs: covered with setae and bristles, a sclerotized subdistal-ventral femoral spot present at surface of leg I and II. Abdomen: same as in male.

Epigyne (Fig. 15A-C ): spermathecae big, reniform (Fig. 15B-C ). Fertilization ducts short, derived from anterior border of spermathecae. Copulatory ducts membranous, slightly sclerotized, around the spermathecae; the part of below the spermathecae coiled into two loops (Fig. 15C ).

Distribution.

Southwestern China (Yunnan).

Remarks.

Miller et al. (2009) established the genus Mosu based on only known females of two species ( M. jujiang and M. huogou ), while studying the symphytognathoid spiders of the Gaoligongshan Mountain. They thought that Mysmena zhengi Lin & Li, 2008 may also belongs to this genus (The species consistent with the common characteristics of the genus: reniform and sclerotized spermathecae, sclerotized fertilization ducts, the copulatory duct membranous and convoluted, sclerotized at end of path near spermathecae). In this paper, we formally proposed transferring this species to Mosu as a new combination, based on a similar configuration of the vulva.

Figures

Figure 13. Mosu zhengi comb. nov. 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; TS = tibial spine on male leg I. Scale bars: 0.50 mm.

Figure 14. Mosu zhengi comb. nov. A, C, D male palp B cymbium. A apical B proventral C prolateral D retrolateral. Abbreviations: Abbreviations: CT = cymbial tooth; Cy = cymbium; CyC = cymbial conductor; CyF = cymbial fold; CyFs = setae on cymbial fold; E = embolus; PC = paracymbium; SD = spermatic duct; Te = tegulum; Ti = palpal tibia. Scale bars: 0.10 mm (A, B); 0.20 mm (C, D).

Figure 15. Mosu zhengi comb. nov. A epigyne B-C vulva. A, B ventral C dorsal. Abbreviations: CD = copulatory duct; FD = fertilization duct; S = spermatheca. Scale bars: 0.20 mm (A); 0.10 mm (B, C).