Hexamatia seekhaow, 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 : 56-59

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.

Figures

Fig. 2. Hexamatia seekhaow gen. et sp. nov., holotype, ♂ (RMNH.ARA.18411). a–c. Habitus. a. Ventral view. b. Lateral view. c. Dorsal view. d. Prosoma, anterior view. e–f. Palp. e. Retrolateral view. f. Ventral view. Scale bars: a–c = 0. 5 mm; d–f = 0.15 mm.

Fig. 3. Hexamatia seekhaow gen. et sp. nov., holotype, ♂ (RMNH.ARA.18411). a–e. Palp. a. Ventral view, cleared. b. Retrolateral view. c. Dorso-retrolateral view, cleared. d. Prolateral view. e. Dorsoretrolateral view. f. Male spinnerets, ventral view. g. Chelicera. Posterior view. Scale bars: a–f = 0.15 mm; g = 0.5 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.