Hahnia ngai Rivera-Quiroz & Petcharad & Miller 2020, sp. nov.

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.