Hahnia ngai, Rivera-Quiroz & Petcharad & Miller, 2020

Rivera-Quiroz, Francisco Andrés, Petcharad, Booppa & Miller, Jeremy A., 2020, First records and a new genus of comb-tailed spiders (Araneae: Hahniidae) from Thailand with comments on the six-eyed species of this family, European Journal of Taxonomy 724, pp. 51-69 : 59-61

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 ).

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.

Figures

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.

Fig. 6. Female spinnerets and genitals. a–c. Hahnia ngai sp. nov., holotype (RMNH.ARA.18415). a. Spinnerets, ventral view. b. Epigynum, cleared, dorsal view. c. Ventral view. d–f. Hahnia saccata Zhang, Li & Zheng, 2011 (RMNH.ARA.18412). d. Spinnerets, ventral view. e. Epigynum, cleared, dorsal view. f. Ventral view. Scale bars: a, d–f = 0.25 mm; b–c = 0.1 mm.

Fig. 5. Hahnia saccata Zhang, Li & Zheng, 2011, ♀ (RMNH.ARA.18412). 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 = 0.50 mm; e–g = 0.25 mm.

Fig. 8. Map of mainland Southeast Asia, showing the collecting sites of Zhang et al. (2011) (Hahnia saccata Zhang, Li & Zheng, 2011 and Hexamatia senaria (Zhang, Li & Zheng, 2011) gen. et comb. nov.), circle; and our new hahniid specimens (Hexamatia seekhaow gen. et sp. nov., Hahnia ngai sp. nov. and Hahnia saccata), square.