Tangguoa laibin Yao & Luo & Li 2021, sp. nov.

Tangguoa laibin Yao & Li sp. nov.

Figs 2–3

Type material. Holotype: male (IZCAS-Ar41631), Longnü Cave (24°8.038′N, 109°57.596′E, elevation 143 m), Longnü Mountain, Dale Town, Xiangzhou County, Laibin, Guangxi, China, 17 August 2009, Z. Yao and C. Wang leg. Paratypes: 6 males (IZCAS-Ar41632–41637) and 5 females (IZCAS-Ar41638–41642), same data as holotype.

Etymology. The specific name refers to the type locality and is a noun in apposition.

Diagnosis. This species can be easily distinguished from T. tongguling sp. nov. by procursus without sclerotized, narrow and curved ventral apophysis (Fig. 2C; present in T. tongguling sp. nov., arrow 2 in Fig. 4C), with angular dorsal apophysis (arrow 3 in Fig. 2C; wide, sclerotized dorsal apophysis with scales in T. tongguling sp. nov., arrow 4 in Fig. 4C) and two retrolateral processes (arrows in Fig. 2D; retrolateral apophysis with scales and pointed sclerite in T. tongguling sp. nov., arrow 5 in Fig. 4C), by male chelicerae without frontal apophyses (Fig. 3C; presence of frontal apophyses with scales in T. tongguling sp. nov., arrow in Fig. 5C), by external female genitalia without postero-lateral apophyses (Fig. 3A; presence of two postero-lateral apophyses in T. tongguling sp. nov., arrows 1–2 in Fig. 5A), by vulva with anteriorly wide and posteriorly sharply pointed pore plates (Fig. 3B; anteriorly wide and posteriorly narrow and blunt in T. tongguling sp. nov., Fig. 5B), and by opisthosoma with posterior marks (Figs 3 E–H; dorsal and lateral spots in T. tongguling sp. nov., Figs 5 E–H).

Description. Male (holotype): Total length 2.84 (3.03 with clypeus), carapace 1.10 long, 1.26 wide, opisthosoma 1.74 long, 1.20 wide. Leg I: 27.85 (7.25 + 0.55 + 7.30 + 9.78 + 2.97), leg II: 19.70 (5.43 + 0.53 + 4.95 + 6.95 + 1.84), leg III: 15.38 (4.48 + 0.47 + 3.84 + 5.25 + 1.34), leg IV: 15.33 (4.47 + 0.47 + 3.80 + 5.28 + 1.31); tibia I L/d: 52. Distance PME-PME 0.16, diameter PME 0.10, distance PME-ALE 0.03, AME absent. Sternum wider than long (0.94/0.76). Habitus as in Figs 3 E–F. Carapace yellowish, with brownish radiating marks and narrow, dark median line; ocular area brownish; clypeus yellowish, with brownish lateral marks; sternum brown. Legs brownish, but slightly whitish on distal parts of femora and tibiae, with distinct darker rings on subdistal parts of femora and tibiae. Opisthosoma yellowish, with large, brown posterior marks. Ocular area slightly elevated and separated from rest of carapace. Thoracic furrow shallow, but distinct. Chelicerae (Figs 3 C–D) with pair of proximo-lateral apophyses (arrow pa in Figs 3 C–D) with lateral apophyses and scales (arrow in Figs 3 C–D) and pair of distal apophyses with row of teeth each (arrow da in Figs 3 C–D). Pedipalps as in Figs 2 A–B; trochanter with retrolateral apophysis and ventral apophysis; femur strongly curved dorsally, with retrolateral apophysis; patella large; procursus simple proximally but complex distally, with sclerotized prolatero-ventral apophysis (arrow 1 in Fig. 2C), sclerotized distal apophysis (arrow 2 in Fig. 2C), angular dorsal apophysis (arrow 3 in Fig. 2C), and two retrolateral processes (arrows in Fig. 2D); bulb simple, without other projections except for embolus. Retrolateral trichobothrium of tibia I at 10% proximally; legs with short vertical setae on tibiae, metatarsi and tarsi, without spines or curved setae; tarsus I with 16 distinct pseudosegments.

Female: Similar to male, habitus as in Figs 3 G–H. Total length 3.44 (3.64 with clypeus), carapace 0.96 long, 1.16 wide, opisthosoma 2.48 long, 1.84 wide; tibia I: 6.76; tibia I L/d: 56. Distance PME-PME 0.15, diameter PME 0.11, distance PME-ALE 0.03, AME absent. Sternum wider than long (0.94/0.75). Carapace with brown margins. External female genitalia (Fig. 3A) brown, with nearly angular postero-median apophysis (arrow ma in Fig. 3A) provided with pointed tip, without pockets. Vulva (Fig. 3B) with curved anterior arch and pair of anteriorly wide and posteriorly sharply pointed pore plates.

Variation: Tibia I in male paratypes (n = 6): 6.92–7.60 (mean: 7.28). Tibia I in the other female paratypes (n = 2, leg I missing in the other two specimens): 6.56, 6.94.

Natural history. The species was found on the wall in the twilight zone (entrance ecotone) of the Longnü Cave (karst area).

Distribution. China (Guangxi, type locality; Fig. 1).