Labullinyphia furcata, Irfan & Peng, 2019

Irfan, Muhammad & Peng, Xianjin, 2019, Herbiphantes Tanasevitch, 1992 and Labullinyphia van Helsdingen, 1985 (Araneae Linyphiidae), two newly recorded spider genera from the Gaoligong Mountains in China with the description of two new species, Zootaxa 4638 (4), pp. 547-561 : 554-558

Labullinyphia furcata new species

( Figures 8–14)

Etymology. The species name comes from the Latin adjective “ furcata ”, meaning “forked”, referring to the bifurcate tip of retrolaeral tibial apophysis in male palp.

Types. Holotype ³, China, Yunnan, Gongshan County, Dulongjiang Township, 2.3–3.3 air km S of Longyuan Village along Dulongjiang , 28.01347°N, 98.32117°E, alt. 1720m, 2 November 2004, D. H. Kavanaugh (DHK– 2004–068) ; Paratypes: 1³ 3♀, same data as holotype (DHK–2004–068) ; 1♀, Gongshan County, Dulongjiang Town- ship, East bench of Dulongjiang at Baili Village, 28.00985°, E 98.32352°E, alt. 1670m, 3 November 2004, D. H. Kavanaugh (DHK–2004–070); 2³ 4♀, Gongshan County, Dulongjiang Township , Xianjiudang Village, 27.92247°N, 98.33213°E, alt. 1634m, 05 November 2004, Guo Tang (Tang–04–07) ; 1♀, Tengchong County, Jietou Township , Qiaotou Village, 25.45931°N, E 98.64114°E, alt. 1652m, 17 May 2006, Chang–min Yin, Jia–fang Hu and Ming–wei Yang (YHY04) .

Diagnosis. The new species resembles Labullinyphia tersa ( Simon, 1894) in having the protegulum comprises of long sclerotized stalk with the distal membranous end; embolus very long and filiform; epigynum with long spirally coiled copulatory ducts ( Figs 9–12; figs 2A, 4A, B, 5E). It can be distinguished by: both male and female provided with cephalic lobe in new species ( Fig. 8B, E), whereas absent in L. tersa ( Benjamin & Hormiga, 2009, fig. 1A, C). The femur I lacks thick spines basally and metatarsus I short, distal end with three macrosetae in new species ( Fig. 11 D–F), whereas femur I ventrally and metatarsus I long, dorsally with several macrosetae in L. tersa ( Benjamin & Hormiga, 2009, fig. 1F). The distal arm of paracymbium, not knob–shaped in new species ( Figs 9B, 10B, 11G), whereas knob–shaped in L. tersa ( Benjamin & Hormiga, 2009, figs 2A, 4E). Embolus with about four and a half spiral coils in new species ( Figs 9 A–C, 10A, B, 11B, C), whereas with two and a half spiral coils in L. tersa ( Benjamin & Hormiga, 2009, figs. 2A, 4E). Spermathecae elliptical in new species ( Figs 12C, D, 13A, B), whereas globular in L. tersa ( Benjamin & Hormiga, 2009, fig. 4AB).

Description. Male (holotype): Total length: 3.29. Carapace 1.63 long, 0.89 wide, dark brown, anteriorly projecting snout–like 0.30 long, with AMEs and covered with setae; cephalic pits present at the base of cephalic lobe; cephalic lobe gear lever-shaped, 0.81 long, covered with spines; provided with thick spines in a row on each side and three patches of hairs anteriorly; cervical and radial grooves distinct ( Fig. 8A, B); clypeus 0.14 high. Sternum longer than wide, dark brown, with spine – like hairs; labium wider than long; maxillae long, distal end broader ( Fig. 8C) with scopulae. Chelicerae with four promarginal and six retromarginal teeth. AER recurved, PER recurved slightly wider. Eye sizes and interdistances: AME 0.08; ALE 0.11; PME 0.10; PLE 0.10; AME–AME 0.10; PME–PME 0.07; AME–ALE, 0.25; PME–PLE 0.11; AME–PME 0.25; ALE–ALE 0.47; PLE–PLE 0.52; ALE–PLE contiguous. Length of legs: I 4.33 (1.17, 1.34, 0.56, 1.36), II 4.45 (1.15, 1.31, 0.87, 0.92), III 3.52 (1.03, 1.01, 0.81, 0.67), IV 4.29 (1.26, 1.25, 0.98, 0.80). Leg I metatarsus short, distal end with three macrosetae (Fig. xxx). Leg formula I–IV–II–III. TmI and TmIV present. Tibial spine formula: 2–2–2–2. Abdomen 1.66 long, 0.98 wide, oval, pale, grey, anteriorly longitudinal and posteriorly with brown chevron–like pattern ( Fig. 13A, B); ventral side with a longitudinal brown band on each side ( Fig. 8C). Palp ( Figs 9–11); tibia with a retrolateral apophysis longer than wide, bifurcated at tip ( Figs 9 A–C, 10A, B); paracymbium with broad distal arm, slightly protruding apically ( Figs 9 A–C, 10A, B, 11G); protegulum with long sclerotized stalk proximally and bifurcated membranous tip ( Figs 9 A–C, 10A, B); distal suprategular apophysis proximally somewhat triangular and a distal long column–shaped apophysis with small membranous part in retrolateral view ( Figs 9 A–C, 10A, B); Radix small and spiral, with a very long filiform embolus with a membranous margin along its full length that coils about four and a half times into concentric spiral turns in the apical region of the palp before continuing to curve out of plane ( Figs 9 A–C, 10A, B, 11G).

Female (paratype): Total length: 3.10. Carapace 1.22 long, 0.88 wide, dark brown, cephalic lobe present; cer- vical and radial grooves distinct ( Fig. 8D, E); clypeus 0.14 high. Sternum longer than wide, dark brown, with spine – like setae; labium wider than long; maxillae long, distal end broader ( Fig. 8F) with scopulae. Chelicerae with five promarginal and five retromarginal teeth. Pedipalpal claw absent. AER recurved, PER recurved slightly wider. Eye sizes and interdistances: AME 0.07; ALE 0.11; PME 0.09; PLE 0.10; AME–AME 0.04; PME–PME 0.06; AME–ALE, 0.05; PME–PLE 0.07; AME–PME 0.08; ALE–ALE 0.41; PLE–PLE 0.46; ALE–PLE contiguous. Length of legs: I 5.7 (1.63, 1.75, 1.09, 1.23), II 5.24 (1.49, 1.64, 1.11, 1), III 3.93 (1.13, 1.18, 0.91, 0.71), IV 4.89 (1.44, 1.46, 1.15, 0.84). Leg formula I–II–IV–III. TmI and TmIV present. Tibial spine formula: 2–2–2–2. Abdomen 1.88 long, 1.05 wide, oval, pale, grey, anteriorly longitudinal and posteriorly with brown chevron–like pattern ( Fig. 8D, E); ventral side with a longitudinal brown band on each side ( Fig. 8F). Tracheal system desmitracheate.

Epigynum and internal genitalia ( Figs 12 A–D, 13A, B): posteroventrally epigynal plate with a socket with long spirally coiled copulatory ducts with an anterior turning point and lateral elliptical spermathecae. Fertilization ducts long and extending mesally.

Distribution. Known only from type locality.