First records and a new genus of comb-tailed spiders (Araneae: Hahniidae) from Thailand with comments on the six-eyed species of this family Author Rivera-Quiroz, Francisco Andrés 970DAA18-987A-4819-BE46-A3D399F77409 Department of Terrestrial Zoology, Understanding Evolution group, Naturalis Biodiversity Center, Darwinweg 2, 2333 CR Leiden, The Netherlands. Institute for Biology Leiden (IBL), Leiden University, Sylviusweg 72, 2333 BE Leiden, The Netherlands. Faculty of Science and Technology, Thammasat University, Rangsit, Pathum Thani, 12121 Thailand. andres.riveraquiroz@naturalis.nl Author Petcharad, Booppa E1480A4E-3FA8-441C-A803-515B8AE7860D ponksee.b@gmail.com Author Miller, Jeremy A. 3B8D159E-8574-4D10-8C2D-716487D5B4D8 Department of Terrestrial Zoology, Understanding Evolution group, Naturalis Biodiversity Center, Darwinweg 2, 2333 CR Leiden, The Netherlands. Institute for Biology Leiden (IBL), Leiden University, Sylviusweg 72, 2333 BE Leiden, The Netherlands. Faculty of Science and Technology, Thammasat University, Rangsit, Pathum Thani, 12121 Thailand. jeremy.miller@naturalis.nl text European Journal of Taxonomy 2020 2020-11-20 724 51 69 journal article 9470 10.5852/ejt.2020.724.1157 8b7e3a10-8d56-4d68-9516-80e08d0565ef 4298074 F8E5876F-1438-4055-9DB8-656969643176 Hahnia ngai sp. nov. urn:lsid:zoobank.org:act: F9A7FE4B-77C4-4D9B-AFDB-A2FC6F5E0739 Figs 4 , 6 a–c Diagnosis Hahnia ngai sp. nov. can be easily separated from other members of this genus by the simplified female genitalia. Copulatory ducts show only slightly swollen areas with glandular insertions ( Figs 4g , 6 b–c) but do not form a receptacle or secondary spermathecae (as seen in Figs 5g , 6 e–f). Etymology The species epithet is a derivation of the Thai ngai (simple), in reference to the relatively simple vulva without the well-formed secondary spermathecae commonly seen in other species of Hahnia . Type material Holotype THAILAND • ♀ ; Chiang Mai Province , Doi Suthep National Park ; 18º48.502′ N , 98º53.528′ E ; 1409 m a.s.l. ; 24–28 Jul. 2018 ; Booppa Petcharad , Jeremy Miller and F. Andrés Rivera-Quiroz leg.; montane evergreen forest with pine ; Winkler extractor ; RMNH.ARA.18415 (four legs used for DNA extraction). Paratypes THAILAND • 1 ♀ ; Chiang Mai Province , Doi Inthanon National Park ; 18º35.268′ N , 98º29.240′ E ; 2572 m a.s.l. ; 24–28 Jul. 2018 ; Booppa Petcharad , Jeremy Miller and F. Andrés Rivera-Quiroz leg.; cloud forest ; Winkler extractor ; RMNH.ARA.18414 • 1 ♀ ; same collection data as for preceding; hand coll .; RMNH.ARA.18413 . Description Female Carapace pear-shaped, reddish-brown, slightly darker in cephalic region; texture smooth ( Fig. 4c ). AME 0.04 mm , ALE 0.06 mm , PME 0.07 mm , PLE 0.04 mm , AME–AME 0.03 mm , AMEALE 0.02 mm , PME–PME 0.05 mm , PME–PLE 0.03 mm ( Fig. 4d ). Chelicerae with three promarginal and three retromarginal teeth ( Fig. 4e ). Legs pale brown, slightly darker on distal segments. Abdomen dark grey with light patches forming five to six chevron bands, oval, longer than wide ( Fig. 4c ). Tracheal spiracle near middle of abdomen ( Fig. 4a ). Fig. 4. Hahnia ngai sp. nov. , holotype, ♀ (RMNH.ARA.18415). a–c . Habitus. a . Ventral view. b . Lateral view. c . Dorsal view. d . Prosoma, anterior view. e . Chelicerae, posterior view. f–g . Epigynum. f . Dorsal view, cleared. g . Ventral view. Scale bars: a–c = 1.0 mm; d–e, g = 0.25 mm; f = 0.1 mm. VULVA. Epigynal plate semitransparent, spermathecae well visible due to transparency. Copulatory openings close together, forming small semi-circular atrium ( Figs 4 f–g, 6c). Spermatheca sub-spherical with brownish-red coloration ( Fig. 4f ). Copulatory ducts very simple, slightly swollen centrally ( Figs 4f , 6 b–c). MEASUREMENTS (in mm). Total length 2.8, carapace 1.25 long, 0.91 wide; clypeus 0.09; chelicera 0.45 long, 0.25 wide; leg I: femur 0.95, patella 0.37, tibia 0.71, metatarsus 0.72, tarsus 0.55; leg II: femur 0.94, patella 0.34, tibia 0.72, metatarsus 0.68, tarsus 0.55; leg III: femur 0.89, patella 0.33, tibia 0.63, metatarsus 0.71, tarsus 0.51; leg IV: femur 1.12, patella 0.34, tibia 0.93, metatarsus 1.01, tarsus 0.62; leg formula IV-I-II-III; abdomen 1.65 long, 1.23 wide. Distribution Known from two localities in Chiang Mai , Thailand ( Fig. 8 ): Doi Suthep National Park ( type locality), and the neighboring Doi Inthanon National Park.