Brommella sejuncta 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 : 165-169

Brommella sejuncta Li , sp. nov. ( Figs 38–39 , 97 )

Type material. Holotype. Female, China, Guangxi, Hechi City , Fengshan County, Fengcheng Town , Songren Village , Xi’an Cave , 24°33.941´N, 107°02.465´E, elev. 574 m, 12 March 2007, Y. Lin & J. Liu leg., deposited in IZCAS.

Etymology. The specific name is derived from the Latin word “ sejunctus ”, meaning “separated”, and refers to the separated sclerotized lateral lob rims of the female epigynum; adjective.

Diagnosis. Females of this new species are most similar to Brommella yizhouensis Li , sp. nov. ( Figs 57–61 ), but can be distinguished by the separated lateral lob rims (fused in B. yizhouensis Li , sp. nov.), the extremely short copulatory ducts (slender and twisted tightly in B. yizhouensis Li , sp. nov.), the large and pear-shaped spermathecae.

Description. Female (holotype). Total length 2.20 ( Figs 39C–D ). Prosoma length 0.93, width 0.75. Cephalic area width

0.45. Carapace pyriform, cephalic part relatively flat, covered with several setae. Thoracic part yellow, fovea reduced, carapace margin distinct. No eyes. Chelicerae length 0.43, width 0.20. Chelicerae with distinct lateral condyles, 3 promarginal and 5 retromarginal teeth. Chelicerae, labium and gnathocoxae yellow-brown; sternum yellow. Labium length 0.11, width 0.20. Gnathocoxae length 0.30, width 0.16. Sternum length 0.55, width 0.50. Legs yellow. Leg formula IV-I-II- III. Leg measurements: I 3.95 (1.10, 0.40, 1.00, 0.85, 0.60); II 3.69 (1.03, 0.33, 0.88, 0.85, 0.60); III 3.39 (1.00, 0.30, 0.75, 0.80, 0.54); IV 4.15 (1.14, 0.33, 1.00, 1.05, 0.63). Ratio Cl/Met IV = 0.25, with 7 curved setae. Opisthosoma length 1.25, width 0.85. Opisthosoma pale, without distinct pattern. Cribellum narrow, undivided.

Epigynum ( Figs 38 , 39A–B ). Width 0.24. Spermathecae pear-shaped, can be easily seen in ventral view. Copulatory ducts very short, not observable in dorsal view. Fertilization duct long, medially attached at base of spermathecae.

Male. Unknown.

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

Figures

Figure 38. Brommella sejuncta Li, sp. nov., holotype, female.A. Vulva, dorsal view. B. Epigynum, ventral view. Scale bars=0.05mm.

Figure 39. Brommella sejuncta Li, sp. nov., holotype, female. A. Epigynum, ventral view. B. Vulva, dorsal view. C. Habitus, dorsal view. D. Habitus, ventral view. Scale bars: A–B=0.05mm; C–D=0.5mm.

Figure 57. Brommella yizhouensis Li, sp. nov., holotype, male. A. Left pedipalpus, prolateral view. B. Left pedipalpus, retrolateral view. Scale bar=0.1mm.

Figure 58. Brommella yizhouensis Li, sp. nov., holotype, male.A. Left pedipalpus, ventral view. B. Palp bulb, ventral view. Scale bars =0.1mm.

Figure 59. Brommella yizhouensis Li, sp. nov., paratype, female. A. Vulva, dorsal view. B. Epigynum, ventral view. Scale bars = 0.05mm.

Figure 60. Brommella yizhouensis Li, sp. nov., holotype, male. A. Palp bulb, ventral view. B. Left pedipalpus, ventral view. C. Left pedipalpus, prolateral view. D. Left pedipalpus, retrolateral view. Scale bars:A =0.05mm; B–D=0.1mm.

Figure 61. Brommella yizhouensis Li, sp. nov., A–D. Paratype, female. E. Holotype, male, habitus, dorsal view.A. Epigynum, ventral view. B. Vulva, dorsal view. C. Habitus, dorsal view. D. Habitus, ventral view. Scale bars: A–B=0.05mm; C–E=0.5mm.

Figure 97. Locality records for twenty-four new species of Dictynidae. 1. Brommella baiseensis Li, sp. nov. 2. B. casseabri Li, sp. nov. 3. B. chongzuoensis Li, sp. nov. 4. B. dolabrata Li, sp. nov. 5. B. funaria Li, sp. nov. 6. B. josephkohi Li, sp. nov. 7. B. linyuchengi Li, sp. nov. 8. B. renguodongi Li, sp. nov. 9. B. resima Li, sp. nov. 10. B. sejuncta Li, sp. nov. 11. B. spirula Li, sp. nov. 12. B. tongyanfengi Li, sp. nov. 13. B. wangfengcheni Li, sp. nov. 14. B. xinganensis Li, sp. nov. 15. B. yizhouensis Li, sp. nov. 16. Cicurina avicularia Li, sp. nov. 17. C. damaoensis Li, sp. nov. 18. C. dong Li, sp. nov. 19. C. kailiensis Li, sp. nov. 20. C. majiangensis Li, sp. nov. 21. C. parallela Li, sp. nov. 22. C. wusanani Li, sp. nov. 23. C. zhazuweii Li, sp. nov. 24. Lathys inaffecta Li, sp. nov.