Brommella xinganensis Li, 2017

Li, Shuqiang & Wang, Xiaoxiao, 2017, New cave-dwelling spiders of the family Dictynidae (Arachnida: Araneae) from Guangxi and Guizhou, China, Zoological Systematics 42 (2), pp. 125-228 : 180-185

publication ID	https://doi.org/ 10.11865/zs.201711
publication LSID	lsid:zoobank.org:pub:AB92E114-07FF-41A5-AF24-DF04F8232CA5
DOI	https://doi.org/10.5281/zenodo.5459571
persistent identifier	https://treatment.plazi.org/id/039E87CA-975F-FF85-FF73-7DC86B72FB83
treatment provided by	Diego
scientific name	Brommella xinganensis Li
status	sp. nov.

Treatment

Brommella xinganensis Li View in CoL , sp. nov. ( Figs 52–56 View Figure 52 View Figure 53 View Figure 54 View Figure 55 View Figure 56 , 97 View Figure 97 )

Type material. Holotype. Male, China, Guangxi, Guilin City , Xing'an County, Rudongyan Village , Rudongyan Cave , 25º34.437'N, 110º37.237'E, elev. 225 m, 9 October 2010, X. Wang & L. Lin leg., deposited in IZCAS GoogleMaps . Paratypes. 1 male, 12 females, same data as holotype, deposited in IZCAS GoogleMaps .

Etymology. The specific name refers to the type locality; adjective.

Diagnosis. This new species is similar to B. punctosparsa (Song, Zhu & Chen, 1999: 363, figs 213K–N), but can be distinguished by the 8-o’clock position of the embolus base (embolus originating at 5-o’clock position in B. punctosparsa ), the conical medial apophysis (obtuse triangle in B. punctosparsa ), and the relatively jumbled copulatory ducts in ventral view (copulatory ducts in coils in B. punctosparsa ).

Description. Male (holotype). Total body length 1.80 ( Fig. 56E View Figure 56 ). Prosoma length 0.85, width 0.68. Cephalic region width 0.43. Cephalic part relatively flat, yellow, darker than thoracic part, covered with several setae. Prosoma margin black, with several radical stripes on the cephalothorax, fovea reduced. Six eyes, AME reduced to small pigment spots, all eyes white, encircled with black. PER straight. Eye diameters: ALE 0.07, PLE 0.08, PME 0.06. Eye interdistances: ALE-PLE 0.02, PLE-PME 0.04, PME-PME 0.06, ALE-ALE 0.08. Eye region length 0.15, width 0.31. Clypeus height 0.09. Chelicerae length 0.28, width 0.19. Chelicerae with distinct lateral condyles, 3 promarginal and 5 retromarginal teeth. Chelicerae light brown, labium and gnathocoxae light brown; sternum yellow. Labium length 0.10, width 0.18. Gnathocoxae length 0.28, width 0.16. Sternum length 0.53, width 0.48. Legs yellow. Leg formula I-IV-II-III. Leg measurements: I 3.78 (1.10, 0.35, 1.00, 0.80, 0.53); II 3.18 (0.90, 0.33, 0.75, 0.70, 0.50); III 2.84 (0.83, 0.28, 0.63, 0.65, 0.45); IV 3.46 (1.00, 0.33, 0.83, 0.80, 0.50). Ratio Cl/Met IV = 0.30, with 8 setae. Opisthosoma length 0.95, width 0.40. Opisthosoma white, without distinct pattern. Cribellum narrow, undivided.

Pedipalpus ( Figs 52–53 View Figure 52 View Figure 53 , 55 View Figure 55 ). Cymbium 0.20 long. Embolus long, filiform, originated at approximately 8-o’clock position. TA prolaterally short and simple; the prolateral apophysis conical, with blunt end. TA retrolateral large, with pointed apex, simple, with a single fold. Base of tibia with a big bifurcated spur.

Female (one of the paratypes). Total body length 2.10 ( Figs 56C–D View Figure 56 ). Prosoma length 0.90, width 0.70. Cephalic region width 0.43. Prosoma margin indistinct. Eye diameters: ALE 0.08, PLE 0.08, PME 0.05. Eye interdistances: ALE-PLE 0.02, PLE-PME 0.04, PME-PME 0.07, ALE-ALE 0.08. Eye region length 0.15, width 0.30. Clypeus height 0.08. Chelicerae length 0.40, width 0.20. Chelicerae with distinct lateral condyles, 3 promarginal and 4 retromarginal teeth. Labium length 0.11, width 0.18. Gnathocoxae length 0.25, width 0.16. Sternum length 0.55, width 0.42. Leg formula I-IV-II-III. Leg measurements: I 3.23 (0.95, 0.33, 0.80, 0.70, 0.45); II 2.78 (0.85, 0.30, 0.60, 0.63, 0.40); III 2.53 (0.75, 0.30, 0.55, 0.55, 0.38); IV 3.20 (0.95, 0.30, 0.75, 0.75, 0.45). Ratio Cl/Met IV = 0.43, with 8 setae. Opisthosoma length 1.25, width 1.00.

Epigynum ( Figs 54 View Figure 54 , 56A–B View Figure 56 ). Width 0.23. BO small and close. Bursae reduced. Copulatory ducts slender, twisted tightly ( Figs 54A View Figure 54 , 56B View Figure 56 ). Part of spermathecae slightly swollen, “C”-shaped.

Variation. Total body length: males 1.8–1.9 (n = 2), females 1.9–2.35 (n = 12).

Distribution. Known only from the type locality ( Fig. 97 View Figure 97 ).