Otacilia acerosa, Yao & Irfan & Peng, 2019

Yao, Na, Irfan, Muhammad & Peng, Xianjin, 2019, Five new species of Otacilia Thorell, 1897 (Araneae: Phrurolithidae) from the Wuling Mountain Range, China, Zootaxa 4613 (2), pp. 290-304 : 291-294

Otacilia acerosa sp. nov.

Figs 1 , 2

Type material. Holotype: ♂ , CHINA, Hubei Province: Enshi City, Xingdou Mountain National Nature Reserve, Sanxianchang , 30°02’20.48”N, 109°08’33.89”E, 1114 m a.s.l., 19 May 2017, leg. Guchun Zhou, Zongguang Huang and Tian Tian. Paratypes: 2 ♂, 2 ♀, same data as holotype .

Etymology. The species name is derived from the Latin adjective “ acerosa ”, meaning “acicular”, and referring to the unique structure of the retrolateral tibial apophysis of the male palp. Adjective.

Diagnosis. The male of new species can be distinguished from all other species in the ‘ pseudostella ’ group except O. ovata Fu, Zhang & Zhang, 2016 (Fu et al. 2016a figs 12, 13), with which it shares a similar paraembolic apophysis (PEA). Otacilia acerosa sp. nov. can be distinguished from O. ovata by the following characters: the dorsal part of the retrolateral tibial apophysis rectangular, the angle between the two branches of the retrolateral tibial apophysis being about 45 degrees in dorsal view in the new species ( Fig. 1F ), whereas in O. ovata the dorsal part of the retrolateral tibial apophysis is subuliform and the angle between the two rami is about 90 degrees in the latter. The female of O. acerosa sp. nov. can be distinguished from all other species in the ‘ pseudostella ’ group, except O. acuta Fu, Zhang & Zhang, 2016 (Fu et al. 2016a, figs 14, 15), which it resembles in having a lateral position of the copulatory openings, but can be distinguished from it by the bursae being oval ( Figs 1C, D , 2D, E ), whereas they are round in O. acuta (see Fu et al. 2016a: figs 14, 15). The spermathecae are longitudinally clavate in O. acerosa sp. nov. ( Figs 1C, D , 2D, E ), whereas L-shaped in O. acuta (see Fu et al. 2016a: figs 14, 15). The glandular duct is present and longitudinally rod-shaped in O. acerosa sp. nov. ( Figs 1C, D , 2D, E ), whereas it is absent in O. acuta (see Fu et al. 2016a: figs 14, 15).

Description. Male (Holotype): Total length 2.29–2.76 (n = 3). Holotype: body 2.42; carapace 1.16 long, 1.11 wide, yellowish grey, anteriorly abruptly narrowed anteriorly; fovea, cervical and radial grooves distinct ( Fig. 1A ).

Clypeus 0.09 high. Chelicerae with 3 promarginal and 2 retromarginal teeth. In dorsal view, AER straight, PER recurved, slightly wider than AER. Eye sizes and interdistances: AME 0.07, ALE 0.09, PME 0.07, PLE 0.08; AME– AME 0.03, AME–ALE 0.02, PME–PME 0.05, PME–PLE 0.05, ALE–PLE 0.06, AME–PME 0.06. MOA 0.19 long, front 0.16 wide, back 0.20 wide. Labium and endites brown. Legs light brown. Measurements of legs: leg I 4.62 (1.26, 0.29, 1.41, 1.12, 0.54), II 3.54 (0.96, 0.28, 0.95, 0.75, 0.60), III 2.64 (0.79, 0.26, 0.63, 0.44, 0.52), IV 4.63 (1.24, 0.33, 1.05, 1.23, 0.78). Leg formula: IV-I-II-III. Femur I with one pl spine; femora I-IV with one do spine; tibiae I with six pairs of ve spines, tibiae II with six pv spines, five rv spines; metatarsi I with four pairs of ve spines, metatarsi II with four pv spines, three rv spines. Abdomen 1.25 long, 0.83 wide, cylindrical, dorsum grey, posteriorly with four chevrons; venter grey. Palp ( Figs 1 E–G, 2A–C). Femur mid-ventrally with an apophysis. Retrolateral tibial apophysis long, ventral ramus sword-shaped, dorsal ramus rectangular. Distal area of cymbium with several macrosetae. Embolus beak-like, prolaterally with sharp paraembolic apophysis. Sperm duct sclerotized. Conductor membranous, sharp, originating from embolus base.

Female: Total length 3.11–3.54 (n = 2). One paratype female: body 3.11; carapace 1.30 long, 1.12 wide, brown, almost round; fovea, cervical and radial grooves distinct ( Fig. 1B ). Eye sizes and interdistances: AME 0.06, ALE 0.09, PME 0.07, PLE 0.07; AME–AME 0.05, AME–ALE 0.02, PME–PME 0.06, PME–PLE 0.06, ALE–PLE 0.02; AME–PME 0.07. MOA 0.19 long, front 0.17 wide, back 0.20 wide. Clypeus 0.09 high. Legs light brown. Measurements of legs: leg I 4.41 (1.15, 0.31, 1.29, 1.07, 0.59), II 3.61 (1.01, 0.32, 0.92, 0.85, 0.51), III 3.12 (0.88, 0.29, 0.65, 0.76, 0.54), IV 4.59 (1.25, 0.33, 1.09, 1.18, 0.74). Leg formula: IV-I-II-III. Femora I with one pl spine; femora I-IV with one do spine; tibiae I with six pairs of ve spines, tibiae II with six pv spines, five rv spines; metatarsi I with four pairs of ve spines, metatarsi II with four pv spines, three rv spines. Abdomen brown, cylindrical. Epigyne ( Figs 1C, D , 2D, E ): Copulatory openings lateral, relatively large, usually covered with mating plug. Abdomen brown, cylindrical. Epigyne ( Figs 1C, D , 2D, E ). Copulatory openings lateral, relatively large, usually covered with mating plug. Copulatory ducts short and thick. Spermathecae longitudinally clavate, widely separated. Bursa oval. Fertilization duct originating posteriorly. Glandular duct longitudinal, clavate.

Distribution. Known only from the type locality ( Fig. 11 ).

Figures

FIGURE 1. Otacilia acerosa sp. nov., holotype male (A, E–H) and paratype female (B–D). A–B habitus, dorsal view C epigyne, ventral view D vulva, dorsal view E male left palp, ventral view F same, dorsal view G same, prolateral view H same, retrolateral view. Scale bars: 0.5mm (A–B), 0.1 mm (C–H).

FIGURE 2. Otacilia acerosa sp. nov., holotype male (A–C) and paratype female (D–E). A male left palp, prolateral view B same, ventral view C same, retrolateral view D epigyne, ventral view E vulva, dorsal view. Scale bars: 0.2 mm (A–E).

FIGURE 11. Distribution records of new species of the genus Otacilia Thorell, 1897 from Wuling Mountain Range, China.