Mosu heguomu Lin & Li, 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 heguomu Lin & Li sp. nov.

Figs 10 , 11 , 12

Type material.

Holotype ♂ (IZCAS) and paratypes 2♂ 4♀ (IZCAS), China: Yunnan, Mengla, Menglun, XTBG, Paramichelia baillonii plantation (about 20 yr.) (22.114°N, 101.279°E; 556 ± 11 m), by pitfall trapping, 1-15.II.2007, G. Zheng leg. Examined.

Other material examined.

4♂ 12♀ (NHMSU), China: Yunnan, Jinghong, Mengla, Mengyuan , Chengzi village , Buffalo Cave Scenic Spot , entrance of 3# cave (21.798°N, 101.399°E; 716 m), by searching, 16.VIII.2011, G. Zheng and Y. Lin leg.

Etymology.

The specific name derives from a Chinese Pinyin “hé guŏ mù”, referring to the Chinese name of Paramichelia baillonii .

Diagnosis.

Male differed from other congeners by the male palp with a cymbial serrula, a distal lobe and median keel on the cymbium, and cymbial tooth on the median cymbium (Fig. 11C ). Female can be distinguished by the sclerotized and expanded copulatory opening at the tip of scape (Fig. 11C, D ).

Description.

Male. Measurements: total length 1.06. Prosoma 0.34 long, 0.5 wide, 0.5 high. Abdomen 0.7 long, 0.76 wide, 0.7 high. Clypeus 0.08 high. Sternum 0.3 long, 0.32 wide. Length of legs: I 1.46 (0.50, 0.16, 0.40, 0.20, 0.20); II 1.32 (0.40, 0.20, 0.30, 0.20, 0.22); III 0.88 (0.30, 0.10, 0.20, 0.16, 0.12); IV 1.04 (0.36, 0.10, 0.24, 0.16, 0.18).

Somatic characters (Fig. 10A-C , 11D ). Coloration: prosoma brown-yellow. Ocular base black. Chelicera yellow. Endites and labium light-yellow. Sternum brown marginally yellow centrally. Legs yellowish brown. Abdomen dark brown with multiple symmetric light-yellow spots. Prosoma: carapace pentagon-shaped in dorsal and peak shape in lateral, marginally not smooth. Cephalic area elevated. Ocular region projecting, eight eyes in two rows. AER and PER recurved in dorsal view, ALE and PLE contiguous. Labium rectangular. Sternum scutiform, covered with short setae. Legs: leg I with a mating clasper on metatarsus, and with a subdistal sclerotized femoral spot at surface of ventral femur. Legs covered with setae and bristles. Abdomen: round in dorsum, covered with pale short setae.

Palp (Fig. 11A-C, E, F ): orange; tibia small, about 1/5 volume of the bulb, with a row of long setae almost encircling the brim (Fig. 11E, F ). Cymbium nearly transparent, "right angle"-shaped, with a cymbial tooth at the ventral median, a list of cymbial serrula, a distal lobe and a median keel on cymbium; the cymbial fold slightly sclerotized, with a row of setae; the tip of cymbium specialized as cymbial conductor (Fig. 11A, C, E ). Bulb oblate, embedded in a translucent membranous tegulum. Embolus filiform, length of embolus coiled into two loops in tegulum, the apical of embolus coiled on the bulb (Fig. 11A, B, E, F ).

Female. Measurements: total length 1.14. Prosoma 0.4 long, 0.48 wide, 0.4 high. Abdomen 0.7 long, 0.7 wide, 0.9 high. Clypeus 0.06 high. Sternum 0.3 long, 0.28 wide. Length of legs: I 1.16 (0.50, 0.12, 0.14, 0.22, 0.18); II 1.06 (0.44, 0.12, 0.14, 0.20, 0.16); III 0.92 (0.28, 0.08, 0.20, 0.16, 0.20); IV 1.22 (0.40, 0.10, 0.30, 0.24, 0.18).

Somatic characters (Fig. 10D-F ). Coloration: prosoma, chelicera endites, labium and sternum yellow-brown. Ocular base black. Legs yellow. Abdomen dark brown with light yellow spots. Prosoma: carapace near pear-shaped, marginally not smooth. Cephalic part slightly elevated. Eight eyes in two rows, white, with black rings. ALE and PLE contiguous. Labium triangle. Sternum scutiform, plump, covered with sparse setae. Legs: a sclerotized femoral spot present at apical ventral surface of leg I and II; covered with setae and bristles. Abdomen: round in dorsum.

Epigyne (Fig. 12A-D ): scape long, the tip with a sclerotized and expanded copulatory opening (Fig. 12A-D ). Spermathecae oval, inclined at 45 degrees. Fertilization ducts short, derived from anterior border of spermathecae. Copulatory ducts around the spermathecae, coiled into multiple loops below the spermathecae (Fig. 12C, D ).

Distribution.

Southwestern China (Yunnan).

Remarks.

The genus Mosu established by Miller et al. (2009) based on only known females of two species ( M. nujiang and M. huogou ), the common characteristics of the genus: kidney-shaped spermathecae, sclerotized fertilization ducts, the copulatory duct membranous and convoluted, sclerotized at end of path near spermathecae. Lin et al. (2013) supplemented male morphological characters, which distinguish the male palps: cymbial process present; bulb nearly globose; tegulum plump, lacks movable sclerites; embolus long, filiform, coiling into two loops under tegulum and reaching to the distal end of cymbium. This new species conforms to this generic characters, but can be clearly distinguished from M. dayan Lin & Li, 2013, M. huogou Miller, Griswold & Yin, 2009, M. nujiang Miller, Griswold & Yin, 2009, M. tanjia Lin & Li, 2013, we propose it as a new species.

Figures

Figure 10. Mosu heguomu sp. nov. A-C male habitus D-F female habitus A, E dorsal B, F ventra C, D lateral. Abbreviations: FS = femoral spot; MC = Metatarsal clasping spine. Scale bars: 0.50 mm.

Figure 11. Mosu heguomu sp. nov. A, B, E, F male palp C cymbium D male left metatarsus I A, C ventral B apical D, E prolateral F retrolateral. Abbreviations: CT = cymbial tooth; Cy = cymbium; CyC = cymbial conductor; CyF = cymbial fold; CyFs = setae on cymbial fold; CyS = cymbial serrula; DL = distal lobe on cymbium; E = embolus; MC = Metatarsal clasping spine; MK = median keel on cymbium; SD = spermatic duct; Te = tegulum; Ti = palpal tibia. Scale bars: 0.20 mm (A-C, E, F); 0.10 mm (D).

Figure 12. Mosu heguomu sp. nov. A, B epigyne C, D vulva A, C ventral B lateral D dorsal. Abbreviations: CD = copulatory duct; CO = copulatory opening; FD = fertilization duct; S = spermatheca; Sp = scape. Scale bars: 0.10 mm.