Liphistius dawei Sivayyapram & Warrit, 2024

Sivayyapram, Varat, Kunsete, Chawakorn, Xu, Xin, Smith, Deborah R., Traiyasut, Prapun, Deowanish, Sureerat, Aung, Mu Mu, Ono, Hirotsugu, Li, Daiqin & Warrit, Natapot, 2024, Seven new species of the segmented spider genus Liphistius (Mesothelae, Liphistiidae) in Thailand and Myanmar, ZooKeys 1189, pp. 201-229 : 201

Liphistius dawei Sivayyapram & Warrit sp. nov.

Figs 1 , 2 , 3

Type material.

Holotype: Myanmar • 1♂; Dawei, Pa Kar Ri; alt. 20 m; 4 May 2018; N. Warrit, V. Sivayyapram, C. Kunsete, N. Chatthanabun, P. Traiyasut leg.; ARA-2018-143. Allotype: Myanmar • 1♀; same data as for the holotype; ARA-2018-138. Paratypes: Myanmar • 1♂ 5♀; same data as for the holotype; ARA-2018-136, ARA-2018-137, ARA-2018-139, ARA-2018-140, ARA-2018-144, ARA-2018-147.

Other material.

Myanmar • 3 juveniles; same data as for the holotype; ARA-2018-146, ARA-2018-148, ARA-2018-149 .

Diagnosis.

Liphistius dawei sp. nov. is similar to L. inthanon Zhan & Xu, 2022 and L. yamasakii Ono, 1988 in large body size with uniformly dark color. The male of L. dawei sp. nov. can be distinguished from those of L. inthanon and L. yamasakii by the palp: subtegulum with moderate apophysis, not enlarged at the tip; tegulum with finer dentate edge of proximal margin and more pronounced marginal apophysis (Fig. 3A-D ; Ono 1988: fig. 8; Schwendinger 1990: fig. 18; Zhan et al. 2022: fig. 4A-G). The female of L. dawei sp. nov. can be distinguished from those of L. inthanon and L. yamasakii by the vulva: posterior stalk axe-blade shaped, constricted at the base; pore plate with less projecting posterior corners of the lateral lips (Fig. 3E, F ; Ono 1988: figs 6, 7; Schwendinger 1990: fig. 19; Zhan et al. 2022: fig. 4H-M).

Description.

Male (Holotype: ARA-2018-143; Fig. 2A ). Coloration (in alcohol): carapace uniformly brown, with black stripe along the margins, bearing short black setae on cephalic region and coxal elevations; abdominal tergite brown, bearing short black setae, paler on the glabrous area; membranous part of the opisthosoma cream color with a smear of black pigment; chelicerae pale brown; palp and legs pale brown, without distinct annulations.

Palp (Fig. 3A-D ): tibial apophysis short, truncate, carrying four black tapering megaspines; cumulus distinctly elevated, bearing long black bristles; paracymbium long, narrow, dark patch with spicules partially isolated by a pale band; subtegulum with moderated apophysis, not enlarged at the tip; contrategulum without apophysis, distal edge of contrategulum arched, leading to conical apex; tegulum kidney-shaped, wider than long, proximal margin convex with finely dentate edge, distal margin slightly concave with round and pronounced apophysis; pigmental bridge between contrategulum and tegulum indistinct; paraembolic plate indistinct, not projecting into a scale-like plate, sclerotized part of the embolus with two longitudinal ridges reaching to the tip.

Measurements: Total length 20.15; carapace 9.75 long, 9.10 wide; opisthosoma 9.36 long, 7.28 wide; ocular tubercle 1.30 long, 1.56 wide; palpal coxa 3.12 long, 1.82 wide; labium 1.04 long, 1.82 wide; sternum 4.55 long, 2.73 wide (1.43 on ventral surface); palp 16.90 long (5.59 + 3.38 + 5.33 + - + 2.60); leg I 28.21 long (8.58 + 4.16 + 5.85 + 7.02 + 2.60); leg II 30.42 long (8.97 + 4.03 + 6.50 + 7.93 + 2.93); leg III 32.04 long (8.58 + 4.16 + 6.50 + 7.93 + 2.93); leg IV 39.91 long (10.7 + 4.29 + 8.19 + 12.48 + 4.68).

Female (Allotype: ARA-2018-138; Fig. 2B ). Coloration (in alcohol): carapace uniformly brown, bearing short black setae on the cephalic region and coxal elevations; abdominal tergites brown, darker in the area with short black setae; membranous part of the opisthosoma cream colored with thin layer of smear black marking; chelicerae bicolor, orange on proximal part and brown on distal part; palp and legs brown, without distinct annulations.

Vulva (Fig. 3E, F ): vulva plate hexagonal, genital atrium with folded lateral margins, carrying lateral hairs; posterior stalk axe-blade shaped, constricted at the based, posterior margin convex; pore plate rectangular and wider than long, lateral margin thickened and projecting into a lips, more distinct on anterior portion, posterior corner slightly projecting, anterior margin thickened and projecting into a lip, slightly arched; receptacular cluster racemose, longer than wide; central dorsal opening wide longer than wide.

Measurements: Total length 27.43; carapace 12.87 long, 12.09 wide; opisthosoma 14.04 long, 11.44 wide; ocular tubercle 1.69 long, 1.95 wide; palpal coxa 4.42 long, 2.47 wide; labium 1.82 long, 3.12 wide; sternum 6.24 long, 3.51 wide (2.08 on ventral surface); palp 22.23 long (8.06 + 4.16 + 5.07 + - + 4.94); leg I 28.47 long (9.75 + 4.94 + 5.98 + 5.46 + 2.34); leg II 29.51 long (9.62 + 5.07 + 5.98 + 5.72 + 3.12); leg III 30.42 long (8.97 + 5.33 + 5.85 + 7.28 + 2.99); leg IV 41.34 long (11.44 + 5.46 + 7.80 + 12.09 + 4.55).

Etymology.

The specific epithet dawei refers to the type locality of the new species in Dawei State, Myanmar.

Distribution.

Known only from the type locality.

Comment.

The new species was mentioned as Liphistius sp. DW in Sivayyapram et al. (2023).

Figures

Figure 1. Map showing the localities of the new Liphistius species described.

Figure 2. Liphistius dawei sp. nov. dorsal habitus A male, ARA- 2018 - 143 (holotype) B female, ARA- 2018 - 138 (allotype). Scale bar: 10 mm.

Figure 3. Liphistius dawei sp. nov. male palp and vulva plate A-D ARA- 2018 - 143 (holotype) palp A prolateral view B ventral view C retrolateral view D distal view E, F ARA- 2018 - 138 (allotype) vulva plate E ventral view F dorsal view. Abbreviations: CDO = central dorsal opening; CT = contrategulum; Cu = cumulus; de = distal edge of the contrategulum; Em = embolus; GA = genital atrium; mm = millimeter; PC = paracymbium; PeP = paraembolic plate; PP = poreplate; PS = posterior stalk; RC = receptacular cluster; ST = subtegulum; T = tegulum; TiA = tibial apophysis. Scale bar: 1 mm.