Otacilia damingshanica sp. nov.

(Figs 4−7, 21)

Type material. Holotype: ♁: China, Guangxi Zhuang Autonomous Region, Nanning City, Wuming County, Daming Mountain Natural Reserve, Daxiagu (meaning Grand Canyon), 23°29'57.48"N, 108°25'43.67"E, 914 m, 1.11.2018. Paratypes: 2 ♀, with same data as holotype.

Etymology. The specific name refers to the type locality, Chinese pinyin 'damingshan'; adjective.

Diagnosis. The male of this new species is similar to that of O. microstoma Wang, Chen, Zhou, Zhang & Zhang, 2015 (see Wang et al. 2015: 449, figs 2c−e) in having a very strong cone-shaped retrolateral tibial apophysis (RTA), but differs from it by the V-shaped sperm duct (vs. U-shaped), the large triangular retrolateral tegular apophysis (rTA) (vs. small) and the broad oval distal tegular apophysis (dTA) pointed anteriorly (Figs 4D, 6A, B) (vs. fan-shaped, not pointed). The female of this species resembles O. xueshanensis Mu, Jin & Zhang, 2022 (see Mu et al. 2022: 258, figs 17e, f, 18e, f) in having a thick, longitudinal copulatory ducts (CD) located at medially, but differs from it by the posterior part of copulatory ducts directed laterally (vs. medially) and pair of large curved spermathecae (vs. small oval) (Figs 5C, 6D).

Description. Male holotype. Habitus as in Figs 4A, B. Total length 3.73, carapace 1.85 long, 1.57 wide. Eye sizes and interdistances: AME 0.08, ALE 0.10, PME 0.08, PLE 0.10; AME−AME 0.06, ALE−AME 0.03, PME−PME 0.13, ALE−ALE 0.28, PLE−PME 0.10, PLE−PLE 0.40, ALE−PLE 0.15, AME−PME 0.12, AME−PLE 0.23. MOA 0.29 long, anterior width 0.23, posterior width 0.29. Chelicera with 3 promarginal (proximal one largest, distal one smallest) and 5 retromarginal teeth (distal one largest, proximal one smallest). Sternum longer than wide, posteriorly pointed. Abdomen 1.61 long, 1.15 wide, with dorsal scutum in anterior half, extending slightly longitudinally past midpoint. Legs measurements: I 7.86 (2.10, 0.72, 2.47, 1.77, 0.80); II 6.44 (1.83, 0.64, 1.95, 1.50, 0.52); III 5.57 (1.55, 0.60, 1.30, 1.35, 0.77); IV 9.02 (2.40, 0.75, 2.25, 2.55, 1.07). Legs spination: femora I d3, pv1111, II d2, pv111, III d1, IV d1; tibiae I v22222222, II v2222222; metatarsi I v2222, II v2222.

Colouration (Figs 4A, B). Carapace yellow-brown, with radial, irregular dark brown mottled markings. Chelicerae yellow-brown. Endites, labium and sternum yellow. Legs yellow. Abdomen gray, with pair of small oval and larger triangular grey spots located on postero-medial dorsal scutum and three light chevrons on posterior part, and oval yellowish stripes in front of anal tubercle; venter grey, with dark grey pattern along midline.

Palp (Figs 4 C−F, 6A−C, 7). Femoral apophysis (FA) well-developed, nearly as long as ½ of femur. Retrolateral tibial apophysis (RTA) stout, as long as tibia, thumb-like in retrolateral view, cone-shaped in dorsal view. Sperm duct (SD) nearly V-shaped in ventral view, extended from base of retrolateral tegular apophysis to embolic base, not reaching middle part of tegulum. Retrolateral tegular apophysis (rTA) strongly sclerotized, triangular, anterolaterally located. Distal tegular apophysis (dTA) broadly oval, membranous, antero-medially located. Embolus (E) spine-like, slightly longer than distal tegular apophysis, directed antero-retrolaterally.

Female paratype. Habitus as in Figs 5A, B. As in male, except as noted. Total length 4.75, carapace 2.05 long, 1.75 wide. Eye diameters: AME 0.13, ALE 0.12, PME 0.10, PLE 0.12; interdistances: AME−AME 0.05, ALE−AME 0.02, PME−PME 0.15, ALE−ALE 0.31, PLE−PME 0.09, PLE−PLE 0.47, ALE−PLE 0.14, AME−PME 0.12, AME−PLE 0.22. MOA 0.30 long, front width 0.29, back width 0.32. Abdomen 2.30 long, 1.63 wide. Legs measurements: I 8.44 (2.14, 0.78, 2.64, 1.95, 0.93); II 6.85 (1.75, 0.70, 2.04, 1.47, 0.89); III 6.12 (1.62, 0.64, 1.45, 1.55, 0.86); IV 9.18 (2.45, 0.80, 2.35, 2.50, 1.08). Legs spination: femora I d2, pv111, II d1; Tibia I v222222222.

Colouration (Fig. 5A, B). Lighter than male. Abdomen ventrally whitish grey, with yellow-brown triangular markings along posterior midline.

Epigyne (Figs 5C, D, 6D, E). Epigynal plate longer than wide, postero-medially with conspicuous spindleshaped median septum. Connecting tubes distinctly visible through integument. Copulatory openings (CO) located anteromedially, with coverings. Copulatory ducts (CD) tubular, longitudinal, anteriorly with a slight bend, posteriorly with pair of balloon-like transparent bursae. Glandular appendage not visible in dorsal view. Bursae (B), covering all of epigynal plate in dorsal view, base of bursae close to spermathecae. Spermathecae (SP) oval, contiguous. Fertilization ducts (FD) long, longer than spermathecae, extending postero-laterally.

Distribution. Known only from the type locality in Guangxi Zhuang Autonomous Region, China (Fig. 21).