Miagrammopes rutundus Liang & Xu, 2021

Liang, Yun, Cai, Qu, Liu, Jinxin, Yin, Haiqiang & Xu, Xiang, 2021, Three species of hackled-orb web spider genus Miagrammopes from China (Araneae, Uloboridae), Zootaxa 5004 (4), pp. 564-576 : 568-569

Miagrammopes rutundus Liang & Xu new species

Figures 4–6

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Type material. Holotype (Ulob-0001- HNU): ♀ CHINA, Guangxi Zhuang Autonomous Region, Chongzuo City , Longzhou County, Nonggang National Reserve , Nonggang Protection Station , 22°27.87'N, 106°55.42'E, 188 m, 28 X, 2017, Ailan He, Keke Liu, Qu Cai, Jihe Liu, Jinxin Liu, Zongguang Huang leg.

Etymology. The specific name is derived from the Latin “rutundus”, meaning “round”, referring to the shape of retrolateral bursa, and is an adjective.

Diagnosis. The female of the new species resembles that of Miagrammopes lehtineni ( Wunderlich, 1976) in having similar vulva but can be distinguished by different shapes and relative sizes of prolateral bursae (PB): prolateral bursae slightly horizontal oval, and almost as large as retrolateral bursae in this species ( Figs 5 , 6 ), while prolateral bursae absolutely longitudinal oval, and much larger than retrolateral bursa in M. lehtineni ( Wunderlich 1976: fig. 8).

Description. Female (holotype; Ulob-0001-HNU): Total length 7.66, carapace 1.24 long, 1.04 wide, 0.53 high, abdomen 2.99 long, 1.22 wide. Carapace ( Fig. 4A, D ) dark, with a pair of spots located on both sides of anterior part, and an irregular pattern between PMEs. Eye diameters: PME 0.12; PLE 0.12; PME-PME 0.51; PME-PLE 0.27. Chelicerae ( Fig. 4D ) pale, without teeth, and with tubercular apophyses and bristles along margins of fang groove. Endite ( Fig. 4E ) pale, longer than wide, poster-medially fused with labium, with some hairs. Labium ( Fig. 4E ) dropshaped, and light color in the terminus. Sternum ( Fig. 4E ) yellowish, divided into three unequal parts, bearing a few hairs. Leg measurements I 2.58 (1.57, 0.52, 0.93, 1.16, 0.4); II 2.31 (0.69, 0.38, 0.49, 0.46, 0.29); III 1.94 (0.62, 0.21, 0.40, 0.41, 0.30); IV 4.15 (1.09, 0.36, 1.08, 0.65, 0.32). Leg formula 1423. Legs ( Fig. 4A–C, F ) yellowish, and metatarsus of leg IV bearing calamistrum and macrosetae. Abdomen deep brown, with three pairs of greyish white patches in dorsal view ( Fig. 4A ), and with a pair of greyish white in front of spinnerets and a large greyish white pattern behind spinnerets in ventral view ( Fig. 4B ).

Epigynum ( Figs 5 , 6 ). Atrium and copulatory opening inconspicuous. Prolateral bursae (PB) oval, slightly slanting towards lateral sides. Retrolateral bursae (RB) spherical, far from each other and almost as large as PB. Copulatory ducts (CD) straight, long and slender. Connecting tube (CT) short, slightly curved, and almost as large as CD in size of tube diameter. Fertilization ducts small, membranous and far from each other.

Male. Unknown.

Distribution. Only the type locality, China (Guangxi Zhuang Autonomous Region) ( Fig. 13 ).

Figures

FIGURE 4. Miagrammopes rutundus n. sp., holotype, female. A, habitus, dorsal view; B, habitus, ventral view; C, habitus, lateral view; D, carapace, dorsal view; E, sternum, ventral view; F, leg I, retrolateral view; G calamistrum, retrolateral view. Scale bars: A–C, F, 1 mm; D, E, G 0.5 mm.

FIGURE 5. Miagrammopes rutundus n. sp., holotype, female.A, epigynum, ventral view; B, vulva, dorsal view.Abbreviations: CD, copulatory duct; CT, connecting tube; FD, fertilization duct; PB, prolateral bursa; RB, retrolateral bursa. Scale bars: A, B, 0.1 mm.

FIGURE 6. Miagrammopes rutundus n. sp., holotype, female.A, epigynum, ventral view; B, vulva, dorsal view.Abbreviations: CD, copulatory duct; CT, connecting tube; FD, fertilization duct; PB, prolateral bursa; RB, retrolateral bursa. Scale bars: A, B, 0.1 mm.

FIGURE 13. Collection localities for three Miagrammopes spp. in China. 1, M. bifurcatus Dong, Yan, Zhu & Song, 2004; 2, M. auriculatus n. sp.; 3, M. rutundus n. sp.