Otacilia spina sp. nov. (flŴṚff)

Figs 34–36

Type material. Holotype ♁, CHINA: Guangxi Zhuang Autonomous Region: Guilin City, Xing'an County, Gaozhai village (25°53'28.28″N, 110°26'04.78″E, 1964 a.s.l.), 12 Aug. 2018, leg. Yannan Mu.

Paratypes: 3 ♁ 7 ♀, with same data as holotype .

Etymology. This specific name is the Latin word for “spine”, referring to the small spine at the base of the prolateral margin of the retrolateral tibial apophysis in retrolateral view.

Diagnosis. This new species resembles O. triangula Mu, Jin & Zhang, 2022 in having a similarly shaped embolus and spermathecae, but can be recognized by: 1) the longer retrolateral tibial apophysis, with a spine-shaped apophysis at the base of the prolateral margin and a mamillary process at the base of the retrolateral margin (vs short, apophysis absent, cf. Fig. 35B, D and fig. 11B, D in Mu et al. [2022]), 2) the dagger-shaped conductor, with a blunt tip (vs triangular, cf. Fig. 35C and fig. 11C in Mu et al. [2022]), 3) the smaller, triangular copulatory openings (vs large, oval, cf. Fig. 35E and fig. 11E in Mu et al. [2022]), and 4) the curved, bow-shaped connecting tubes (vs auricular, cf. Fig. 35F and fig. 11F in Mu et al. [2022]).

Description. Male (Holotype): total length 4.06, carapace 1.95 long, 1.60 wide; abdomen 2.11 long, 1.27 wide. Eye sizes and interdistances: AME 0.12, ALE 0.12, PME 0.09, PLE 0.11; AME–AME 0.06, AME–ALE 0.01, ALE–ALE 0.29, PME–PME 0.14, PME–PLE 0.07, PLE–PLE 0.48, ALE–PLE 0.10. EAW 0.64, CRW 0.89, EAW/CRW 0.72, CRW/CW 0.56. MOA 0.32 long, anterior width 0.28, posterior width 0.34. CH 0.18, CH /AME 1.50. Labium 0.17 long, 0.24 wide. Sternum 1.07 long, 0.95 wide. Leg measurements: Ⅰ 7.52 (2.02, 0.68, 2.20, 1.80, 0.79), II 6.30 (1.71, 0.67, 1.61, 1.48, 0.83), III 5.50 (1.50, 0.62, 1.20, 1.43, 0.75), IV 8.28 (2.30, 0.74, 1.92, 2.31, 1.01). Spination: femur I d 2 pl 4, femur II d 1 pl 3, femora III–IV d 1, tibia Ⅰ pv 7 rv 8, tibia II pv 8 rv 7, metatarsus Ⅰ pv 4 rv 4, metatarsus II pv 4 rv 3.

Coloration. Carapace yellow, with two black longitudinal stripes. Abdomen gray, with short narrow dorsal scutum, tip black, posteriorly with four black transverse stripes, venter with an H-shaped black pattern (Fig. 34A, B). Legs yellow.

Palp as in Figs 35A–D, 36A–C. Femoral apophysis well developed, nearly at middle of femur. Tibia short, about half length of femur. Retrolateral tibial apophysis long, with spine-shaped apophysis at base of prolateral margin and mamillary process at base of retrolateral margin. Bulb large, pyriform. Tegulum wider than cymbium, tegular apophysis long, tip coracoid. Sperm duct distinct, tapering from retrolateral side of tegulum to embolus. Embolus thick, strongly curved. Conductor dagger-shaped, tip blunt.

Female (Paratype): total length 3.75, carapace 1.85 long, 1.66 wide; abdomen 1.90 long, 1.36 wide. Eye sizes and interdistances: AME 0.11, ALE 0.12, PME 0.09, PLE 0.11; AME–AME 0.06, AME–ALE 0.01, ALE–ALE 0.28, PME–PME 0.17, PME–PLE 0.07, PLE–PLE 0.47, ALE–PLE 0.10. EAW 0.63, CRW 0.96, EAW/CRW 0.66, CRW/CW 0.58. MOA 0.31 long, anterior width 0.25, posterior width 0.35. CH 0.14, CH /AME 1.27. Labium 0.18 long, 0.25 wide. Sternum 1.13 long, 0.96 wide. Leg measurements: Ⅰ 7.02 (1.79, 0.68, 2.21, 1.75, 0.59), II 6.07 (1.63, 0.66, 1.62, 1.41, 0.75), III 5.16 (1.38, 0.62, 1.07, 1.33, 0.76), IV 7.64 (2.06, 0.70, 1.80, 2.11, 0.97). Spination: femur I d 2 pl 4, femur II d 1 pl 3, femora III–IV d 1, tibia Ⅰ pv 7 rv 8, tibia II pv 8 rv 7, metatarsus Ⅰ pv 4 rv 4, metatarsus II pv 4 rv 3. Legs yellow, with black annuli near tip of femora Ⅰ–IV. Other characters as in male, except carapace darker and dorsal scutum absent (Fig. 34C, D).

Epigyne as in Figs 35E–F, 36D–E. Epigynal plate sclerotized, slightly depressed in center, posterior margin W-shaped. Median septum wide. Copulatory openings small and triangular, located at anterior of depressed area, separated by median septum. Copulatory ducts short. Connecting tubes long and curved, bow-shaped. Glandular appendages short, mastoid-shaped. Bursa large, transparent, nearly rectangular. Spermathecae oval, separated by about half their diameter. Fertilization ducts located at anterior margin of spermathecae.

Distribution. China (Guangxi Zhuang Autonomous Region).