Otacilia guoi sp. nov. (Ḃ氏Þffifl)

Figs 1C–D, 4, 5

Type material. Holotype ♂: CHINA: Sichuan Province: Ya’an City, Shimian County, Liziping National Natural Reserve Gongyihai Station, Mamadi (28°59.65′N, 102°24.53′E, 2516 m elev.), 24 Jul. 2016, leg. Xiangbo Guo.

Paratypes: 2♂ 3♀, with same data as holotype; 5♂ 2♀, same station as holotype, Hot spring (29°01.50′N, 102°23.07′E, 2032 m elev.), 25 Jul. 2016, leg. Xiangbo Guo ; 2♂, Liziping National Natural Reserve Zima Station (28°58.67′N, 102°16.50′E, 1926 m elev.), 28 Jul. 2016, leg. Xiangbo Guo.

Etymology. The specific name is taken from the family name of Xiangbo Guo, the collector of this new species; noun in genitive case.

Diagnosis. This new species resembles O. simianshan Zhou, Wang & Zhang, 2013 in having a similarly shaped RTA, FA, and bursa (see Fig. 5B–C and fig. 2B–C in Zhou et al. 2013), but males can be distinguished by the narrow RTA (vs broad, compare Fig. 5B with fig. 2C in Zhou et al. 2013) and the round TA (vs triangular, compare Figs 4C, 5C with figs 2B, 3F in Zhou et al. 2013). Females can be distinguished by the large spermathecae (vs small, compare Figs 4F, 5F with figs 2E, 3I in Zhou et al. 2013) and the long and closely situated connecting tube (vs short and separated, compare Figs 4E, 5E with figs 2D, 3H in Zhou et al. 2013).

Description. Male: total length 3.39–3.65 (n=10). Holotype (Fig. 1C): total length 3.53, carapace 1.68 long, 1.46 wide (CW); abdomen 1.85 long, 1.27 wide. Eye sizes and interdistances: AME 0.10, ALE 0.09, PME 0.08, PLE 0.10; AME–AME 0.06, AME–ALE 0.02, ALE–ALE 0.25, PME–PME 0.13, PME–PLE 0.09, PLE–PLE 0.46, ALE–PLE 0.13. Eye area 0.58 wide (EAW), cephalic region 0.82 wide (CRW), EAW/CRW 0.71. CRW/CW 0.56. MOA 0.27 long, anterior width 0.23, posterior width 0.31. Clypeal height 0.14 (CH), CH /AME 1.40. Chelicerae with three promarginal and eight retromarginal teeth. Carapace brown, with light ring around margin of carapace. Abdomen oval, gray, with small and diamond-shaped dorsal scutum anteriorly, two arrow-like black spots beside scutum, and three black chevron stripes posteriorly (Fig. 1C).

Palp as in Figs 4A–D, 5A–D. FA strong raised, located at middle part, with short longitudinal depression on posterior side (Fig. 4B). Tibia with sclerotized rounded prolateral apophysis. RTA longer than tibia, nearly half length of cymbium, broad, slightly curved, tapering abruptly to thin tip. Middle part of distal tegulum with weakly sclerotized, subtriangular, protruding excrescence. Sperm duct distinct, surrounding membranous excrescence. Embolus thin, originating at ten o’clock of tegulum. Conductor absent, TA round.

Female: total length 3.52–3.81 (n=5). One paratype (Fig. 1D): total length 3.81, carapace 1.73 long, 1.51 wide (CW); abdomen 2.04 long, 1.36 wide. Eye sizes and interdistances: AME 0.09, ALE 0.10, PME 0.09, PLE 0.11; AME – AME 0.05, AME – ALE 0.13, ALE – ALE 0.24, PME – PME 0.09, PME – PLE 0.07, PLE – PLE 0.43, ALE – PLE 0.12. Eye area 0.57 wide (EAW), cephalic region 0.79 wide (CRW), EAW/CRW 0.72. CRW/CW 0.52. MOA 0.25 long, anterior width 0.22, posterior width 0.30. Clypeal height 0.13 (CH), CH / AME 1.44. Other characters as for male, except four black chevron stripes posteriorly on abdomen, lack of DS, heavier color and slightly larger body size (Fig. 1D) .

Epigyne as in Figs 4E–F, 5E–F. Epigynal plate with distinct atrium at central part. Median septum short, as wide as spermathecae width (Fig. 4E). Copulatory openings small, triangular (Fig. 5E), located at middle part of epigynal plate, close to each other. Copulatory ducts thick, extending to vulva, gradually separating away near their ends, curving upward abruptly and connected to bursa (Fig. 5F). Glandular appendages digit-shaped (Fig. 5E); connecting tube thin, located at middle of copulatory ducts (Fig. 5E), connected to posterior of spermathecae. Spermathecae oval, middle size, close to each other. Fertilization ducts located on anterior margin of spermathecae.

Measurements of legs:

Spination of legs:

Distribution. China (Sichuan Province).