Hexamatia seekhaow gen. et sp. nov.

urn:lsid:zoobank.org:act: 1D1D0DE7-8A2A-4469-8867-666F9AD6EAEB

Figs 2–3

Diagnosis

Hexamatia seekhaow gen. et sp. nov. greatly resembles H. senaria gen. nov. but can be distinguished by the bifurcated PA and having a slightly shorter RTA with a blunter tip (Figs 2f, 3 d–e; Zhang et al. 2011: figs 21a–d, 22). Another putative difference is the presence of denticles in the distal portion of the RTA; these are not mentioned nor illustrated for H. senaria gen. nov.

Etymology

The species epithet is a derivation of the Thai seekhaow (white); refers to the lack of color on the body of the holotype of this species.

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; hand coll. among leaf litter; RMNH.ARA.18411 (four legs used for DNA extraction).

Description

Male holotype

Carapace yellowish-white, pale brown in cephalic region (Fig. 2 b–c). Legs same color as carapace. Abdomen white without chevron pattern, oval, longer than wide (Fig. 2 a–c). Six eyes in two triads,

AME absent ALE 0.04 mm, PME 0.02 mm, PLE 0.02 mm, ALE–ALE 0.02 mm, PME–PME 0.03 mm, PME–PLE contiguous (Fig. 2d). Chelicerae with three promarginal and two retromarginal teeth (Fig. 3g).Tracheal spiracle near middle of abdomen (Fig. 2a).

PALP. Pale brown, same color as cephalic region (Fig. 2c). CF darker, almost as long as RTA (Figs 2 e–f, 3b), oval-shaped from ventral view (Figs 2f, 3a). Median apophysis narrow, elongate and transparent (Fig. 3 a–b). Embolus filiform, black and long, originating retrollaterally and coiling clockwise around bulb (Figs 2f, 3 a–b). RTA spur-like with dark rings. Patellar apophysis short and bifid, with the longer prong hook-shaped (Fig. 3c).

MEASUREMENTS (in mm). Total length 1.1, carapace 0.46 long, 0.33 wide; clypeus 0.01; chelicera 0.2 long, 0.1 wide; pedipalp 0.4 long; palp bulb 0.11 wide; leg I: femur 0.32, patella 0.13, tibia 0.26, metatarsus 0.22, tarsus 0.15; leg II: femur 0.31, patella 0.12, tibia 0.19, metatarsus 0.19, tarsus 0.15; leg III: femur 0.27, patella 0.08, tibia 0.16, metatarsus 0.17, tarsus 0.15; leg IV: femur 0.34, patella 0.11, tibia 0.22, metatarsus 0.21, tarsus 0.16; leg formula IV-I-II-III; abdomen 0.45 long, 0.34 wide.

Distribution

Known from the type locality, Doi Suthep National Park, Chiang Mai, Thailand (Fig. 8).

Notes

See the Discussion for remarks on six-eyed species.