Trilacuna hponkanrazi Tong & Li, 2020

Tong, Yanfeng, Li, Shuqiang & Bian, Dongju, 2020, Taxonomic studies on the genus Trilacuna (Araneae, Oonopidae) from Myanmar, ZooKeys 960, pp. 39-62 : 39

Trilacuna hponkanrazi Tong & Li sp. nov. Figs 7 , 8 , 9 , 14G-I , 15E, F , 16C, D

Type material.

Holotype ♂: Myanmar, Kachin State, Putao, Hponkanrazi Wildlife Sanctuary, around Ziradum; 27°34.499'N, 97°03.546'E; elevation ca 1100 m; 19.XII.2016; Wu J. leg. (IZCAS AR-25141). Paratypes 1♀: Myanmar, same data as for holotype (IZCAS AR-25142); 2♂1♀: roadside between Wasadum and Ziradum; 27°32.305'N, 97°07.537'E; elevation ca 980 m; 12.XII.2016; Wu J. leg. (IZCAS AR-25143-25144-25145); 1♂: same data as preceding; 27°32.767'N, 97°07.283'E; elevation ca 970 m; 12.XII.2016; Wu J. leg. (IZCAS AR-25146); 3♀: around Ziradum Village; 27°33.465'N, 97°06.580'E; 1051 m; 8.V.2017; Wu J. leg. (IZCAS AR-25147-25148-25149); 1♀: same data as preceding; 27°35.305'N, 97°04.893'E; elevation ca 1140 m; 13.V.2017; Wu J. leg. (IZCAS AR-25150).

Diagnosis.

The new species is similar to T. gongshan Tong, Zhang & Li, 2019 but can be distinguished by the forked dorsal branch of the embolus system (Fig. 8E ), the curved, strongly sclerotized posterior ridge (spr) of the female’s epigastric area (Fig. 9G ), and the reticulate carapace (Figs 7D, F , 9D, F ) of both sexes. Trilacuna gongshan has three long, tooth-like lobes in the embolus system, without a curved, strongly sclerotized posterior ridge in the female’s epigastric area , and with a granulate carapace in both sexes ( Tong et al. 2019: figs 10-12, 24G, H).

Description.

Male. Body: yellow, chelicerae and sternum lighter; habitus as in Figure 7A-C ; body length 1.49. Carapace: 0.74 long, 0.60 wide; sides finely reticulate; lateral margin rebordered (Fig. 7C ). Eyes: ALE largest; PLE and PME nearly equal in size; ALE-PLE separated by less than ALE radius; PME touching each other; posterior eye row recurved as viewed from above, procurved as viewed from front (Fig. 7D, H ). Clypeus: height about 1.25 times of ALE diameter. Mouthparts (Figs 7E, H , 16C, D ). Sternum (Fig. 7E ). Abdomen: 0.63 long, 0.48 wide; booklung covers ovoid, surface smooth (Fig. 7C ); dorsal scutum not fused with epigastric scutum; apodemes absent; posterior spiracles not connected by groove; epigastric region with patches between the posterior spiracles (Fig. 7G ). Palp (Figs 8 , 14G-I ): orange; 0.52 long (0.15, 0.09, 0.13, 0.15); femur greatly swollen (width/length = 0.74) (Fig. 8A, B ); bulb oval, stout, tapering apically; embolus system (Fig. 8E, F, H ) with a forked dorsal branch (db) and a small ventral lobe (svl) in prolateral view, with a small median branch (mb) and a lateral branch (lb) in retrolateral view.

Female. Same as male except as noted. Habitus: as in Figure 9A-C . Body: length 1.43. Carapace: 0.70 long, 0.57 wide. Abdomen: 0.76 long, 0.45 wide. Epigastric area (Figs 9G , 15E ): with a curved, strongly sclerotized posterior ridge (spr). Endogyne (Fig. 15F ): with narrow, transverse sclerite (tsc), an anterior stick-shaped sclerite (as), and a posterior small globular structure (glo); transverse bars (tba) with two lateral apodemes (ap).

Etymology.

The specific name is a noun in apposition taken from the type locality.

Distribution.

Known only from the type locality.

Figures

Figure 7. Trilacuna hponkanrazi sp. nov., male holotype A-C habitus in dorsal, ventral, and lateral views D-F, H prosoma in dorsal, ventral, lateral, and anterior views G abdomen in ventral view (arrow shows the patches). Abbreviations: boc = booklung covers; ldi = labium deep incision. Scale bars: 0.4 mm.

Figure 8. Trilacuna hponkanrazi sp. nov., male holotype, left palp, SEM A, B, G prolateral, retrolateral and dorsal views C, D palpal bulb in prolateral and retrolateral views E, F, H distal part of palpal bulb in prolateral, retrolateral, and dorsal views. Abbreviations: db = dorsal branch; ds = dorsal setae; lb = lateral branch; smb = small median branch; svl = small ventral lobe; vs = ventral setae.

Figure 9. Trilacuna hponkanrazi sp. nov., female (IZCAS AR- 25147) A-C habitus in dorsal, ventral, and lateral views D-F, H prosoma in dorsal, ventral, lateral, and anterior views G abdomen in ventral view. Abbreviation: ldi = labium deep incision; spr = sclerotized posterior ridge. Scale bars: 0.4 mm.

Figure 14. Trilacuna spp., left male palp A-C T. besucheti D-F T. changzi sp. nov. G-I T. hponkanrazi sp. nov. J-L T. triseta sp. nov. A, D, G, J prolateral views B, E, H, K dorsal views C, F, I, L retrolateral views. Scales: 0.2 mm.

Figure 15. Trilacuna spp., female copulatory organ A, B T. besucheti C, D T. changzi sp. nov. E, F T. hponkanrazi sp. nov. G, H T. loebli I, J T. zhigangi sp. nov. A, C, E, G, I ventral view B, D, F, H, J dorsal view. Abbreviations: ap = apodeme; as = anterior sclerite; db = darkened band; glo = globular structure; psp = posterior spiracle; sep = semicircular plate; tba = transverse bars; tp = triangular plate; tsc = transverse sclerite. Scales: 0.2 mm.

Figure 16. Trilacuna spp., male labium and endites, ventral view A, B T. changzi sp. nov., white arrow shows the long, strongly curved spines C, D T. hponkanrazi sp. nov. E, F T. besucheti G, H T. triseta sp. nov., black arrow shows the three black, strong setae. Abbreviations: bts = bent thick setae; cos = comb-like setae.