Lathys inaffecta 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 : 226-227

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.5459583
persistent identifier	https://treatment.plazi.org/id/039E87CA-970D-FFDF-FF73-7DC86DF6FEEC
treatment provided by	Diego
scientific name	Lathys inaffecta Li
status	sp. nov.

Treatment

Lathys inaffecta Li View in CoL , sp. nov. ( Figs 92 View Figure 92 , 93A–B View Figure 93 , 94–97 View Figure 94 View Figure 95 View Figure 96 View Figure 97 )

Type material. Holotype. Male, China, Guizhou, Kaili City, Zhouxi Town , Wangzhou Cave , 26°29.261´N, 107°55.416´E, elev. 704 m, 25 May 2007, Y. Lin & J. Liu leg., deposited in IZCAS GoogleMaps . Paratypes. 2 females, same data as holotype, deposited in IZCAS GoogleMaps .

Compared type material. Paratypes of L. chishuiensis ( Figs 90–91 View Figure 90 View Figure 91 , 93C View Figure 93 ), 1 male and 1 female, Suoluo Nature Reserve, Jinshagou , Guizhou, 28 May 2008, deposited in SWUC .

Etymology. The specific name is derived from the Latin word “ inaffectus ”, meaning “smooth”, and refers to the shape of the most conspicuous tibial spine; adjective.

Diagnosis. This new species is similar to L. chishuiensis (Zhang, Yang & Zhang, 2009; Figs 90–91 View Figure 90 View Figure 91 ), but can be separated by the smooth retro-dorsal tibial spine (with a row of denticles on the retro-dorsal spine in L. chishuiensis ), TA prolaterally short, about 1/5 of TA length (about 1/3 of TA length in L. chishuiensis ).

Description. Male (holotype). Total tength 3.01 ( Figs 96D–E View Figure 96 ). Prosoma length 1.33, with 1.14. Cephalic region width 0.74. Cephalic part strongly elevated, dark brown, with several setae. Thoracic part brown, furrows indistinct, fovea reduced. Prosoma margin black. Six eyes, PER procurved in dorsal view, AME absent. All eyes encircled with black. Eyes subequal in size. ALE 0.10, PLE 0.10, PME 0.10. Eye region length 0.26, width 0.47. ALE-ALE 0.17, PME-PME 0.09, PME-PLE 0.06. Clypeus height 0.07. Chelicerae length 0.67, width 0.32. Chelicerae dark brown, with distinct lateral condyles, 3 promarginal and 4 retromarginal teeth. Labium dark brown, gnathocoxae dark brown, sternum yellow-brown. Labium length 0.25, width 0.28. Gnathocoxae length 0.49, width 0.25. Sternum length 0.79, width 0.69. Legs yellow-brown. Leg formula I-IV-II-III. Leg measurements: I 4.84 (1.48, 0.44, 1.09, 1.14, 0.69); II 4.25 (1.14, 0.44, 1.09, 0.99, 0.59); III 3.81 (0.99, 0.40, 1.04, 0.84, 0.54); IV 4.58 (1.28, 0.44, 1.38, 0.99, 0.49). Ratio Cl/Met IV = 0.56, with 14 setae. Opisthosoma length 1.83, width 1.28. Opisthosoma pale yellow, with black anchor shaped pattern. Ventral without distinct pattern. Cribellum narrow, undivided.

Pedipalpus ( Figs 92–93 View Figure 92 View Figure 93 , 95 View Figure 95 ) relatively large. Embolus relatively short, filiform, originating at approximately 12-o’clock position. TA prolaterally small and pointed. Prolateral of TA with a sheet apophysis. RTA with a tiny apophysis and a spine apically. Three spines present on the tibia, a prominent and smooth spine and a hooked spine on the dorsum of tibia, and a tiny spine located at the base of RTA. Apex of patella with a spine.

Female (one of the paratypes). Total body length 2.57 ( Fig. 96C View Figure 96 ). Prosoma length 1.28, width 1.04. Cephalic region width 0.74. Eye diameters: ALE 0.10, PLE 0.10, PME 0.09. Eye interdistances: ALE-ALE 0.16, ALE-PLE 0.01, PME-PLE 0.07, PME-PME 0.09. Clypeus height 0.06. Chelicerae length 0.74, width 0.32. Chelicerae with distinct lateral condyles, 2 promarginal and 4 retromarginal teeth. Labium length 0.22, width 0.26. Gnathocoxae length 0.42, width 0.26. Sternum length 0.84, width 0.59. Leg formula I-IV-II-III. Leg measurements: I 4.24 (1.28, 0.44, 1.09, 0.89, 0.54); II 3.56 (1.09, 0.40, 0.84, 0.74, 0.49); III 2.80 (0.99, 0.35, 0.40, 0.64, 0.42); IV 3.80 (1.19, 0.44, 0.94, 0.79, 0.44). Ratio Cl/Met IV = 0.56, with 16 setae. Opisthosoma length 1.43, width 1.09. Opisthosoma white.

Epigynum ( Figs 94 View Figure 94 , 96A–B View Figure 96 ). Width 0.37. BO small, round and sclerotized. Copulatory ducts short, touching at midline, forming an "X". Spermathecae large, oval, widely separated. Fertilization duct internally attached to the spermathecae base.

Variation. Total body length: females 2.57–2.85 (n = 2).

Distribution. Known only from the type locality in Guizhou, China ( Fig. 97 View Figure 97 ).

Remarks. The species differs only slightly from L. chishuiensis Zhang, Yang & Zhang, 2009 . Zhang, Hu & Zhang (2012) excluded L. chishuiensis from Lathys , but could not transfer it to any of known genera. Zhang suggested erecting a new genus to include L. chishuiensis (personnal communication). Pending such a transfer to a new genus, we have also preliminarily placed L. inaffecta Li , sp. nov., along side with L. chishuiensis , in Lathys .

Funding This study was supported by the National Natural Sciences Foundation of China (31471960, 31530067) and the Southeast Asia Biodiversity Research Institute, Chinese Academy of Sciences (2015CASEABRI005, Y4ZK111B01).

Acknowledgments The manuscript benefitted greatly from comments by Peter Jäger (Frankfurt am Main, Germany), Yuri M. Marusik (Magadan, Russia), Yanfeng Tong (Shenyang, China) and Yucheng Lin (Chengdu, China). Fuqiang Chen (Beijing, China) helped to modify the drawings. Joseph K. H. Koh ( Singapore) kindly checked the English of the manuscript.