Trilacuna besucheti Grismado & Piacentini, 2014

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

Trilacuna besucheti Grismado & Piacentini, 2014 Figs 1 , 2 , 3 , 14A-C , 15A, B , 16E, F

Trilacuna besucheti Grismado & Piacentini, in Grismado et al. 2014: 40, fig. 32A-H, 33A-F, 34A-F, 39C-D

Material examined.

3♂1♀, Myanmar, near 1.5 km from the roadside between Kanpetlet and Nat Ma Taung National Park; 21°13.058'N, 93°59.033'E; elevation ca 2420 m; 1.V.2017; Wu J. and Chen Z. leg. (IZCAS AR-25151-25152-25153-25154).

Diagnosis.

Males of this species can be recognized by the circular, scale-like structure on the distal part of the bulb (white arrows in Fig. 2E, F ) and the cymbium, which has two or three stout, dark setae with large bases (black arrows in Fig. 2G ). Females are distinguished by having a darkened band (db) on the posterior margin of the epigastric furrow (Figs 3G , 15A ).

Description.

See Grismado et al. (2014).

Variation.

The specimens from Myanmar have unbranched endites (Fig. 16E, F ) and a strongly striated carapace (Figs 1D, F , 3D, F ), whereas the specimens from India have distinctly branched endites and a smooth carapace ( Grismado et al. 2014: figs 32-34).

Distribution.

India (Meghalaya), Myanmar.

Figures

Figure 1. Trilacuna besucheti, male (IZCAS AR- 25151) A-C habitus in dorsal, ventral, and lateral views D-F, H prosoma in dorsal, ventral, lateral, and anterior views G labium and endites in ventral view. Abbreviations: boc = booklung covers; bts = bent thick setae; cmp = clypeus median projection; esb = elevated seta base; ldi = labium deep incision. Scale bars: 0.4 mm (A-F, H); 0.2 mm (G).

Figure 2. Trilacuna besucheti, left male palp, SEM (IZCAS AR- 25151) A, B, H prolateral, retrolateral, and dorsal views C, D palpal bulb in prolateral and retrolateral views E, F, I distal part of palpal bulb in prolateral, retrolateral, and dorsal views (white arrows show the circular scale-like structure) G cymbium in prolateral view (black arrows show the large setae bases). Abbreviations: ab = anterior branch; emb = embolus; lb = lateral branch; ls = long setae.

Figure 3. Trilacuna besucheti, female (IZCAS AR- 25154) A-C habitus in dorsal, ventral, and lateral views D-F prosoma in dorsal, ventral, and lateral views G abdomen in ventral view. Abbreviation: db = darkened band; ldi = labium deep incision. 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.