Trilacuna rastrum Tong & Li, 2007.

This genus was originally diagnosed by the enlarged male palpal femora, the very complicated embolus-conductor complex, the branched endites in males, and the notched labium (Tong and Li 2007). These characters were later recognized as shared by a more inclusive group, the “Dysderoides complex”, including Bannana Tong & Li, 2015, Dysderoides Fage, 1946, Himalayana Grismado, 2014, and Trilacuna (Grismado et al. 2014; Tong and Li 2015). The genus Bannana is distributed only in Xishuangbanna, Yunnan Province, China; Dysderoides species were known from caves from northern India and Thailand; species of Himalayana were known only in Nepal and northern India; while those of Trilacuna have a wider distribution from Iran to the Korean Peninsula.

The genus Trilacuna can be distinguished from the other genera of the Dysderoides complex by the females having a long postepigastric scutum, covering almost the whole ventral abdomen (Fig. 3G), and males usually lacking the furrow connecting the posterior tracheal spiracles (Fig. 1H). The females of the other genera of the Dysderoides complex, Bannana, Dysderoides, and Himalayana have a very short postepigastric scutum, only around the epigastric furrow (Grismado et al. 2014: fig. 12E, 69H; Tong and Li 2015: fig. 5G), and males have the furrow connecting the posterior tracheal spiracles (Grismado et al. 2014: fig. 59D; Tong and Li 2015: fig. 1G).

29 species, 7 of them are described here.

Iran to Korean Peninsula.

Holotype ♂ (SYNU-254), China, Yunnan Province, Baoshan City, Bawan Town, Dasheyao, 13.II.2011, Zongxu Li & Luyu Wang. Paratypes: 3♀ (SYNU-252), same data as holotype; 1♂ (SYNU-253), same locality as holotype, 14.II.2011.

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

Males of the new species is similar to T. hansanensis Seo, 2017, but can be distinguished by the following characters: sternum with grooves (gro) on posterior area (Fig. 1E); epigastric region strongly elevated, then followed by a narrow, slightly median elevation (mel) (Fig. 1I); embolus system with a leaf-shaped projection on basal part (blp) (Fig. 2B, D). T. hansanensis has a pair of chitinized ridges on posterior area of sternum (Seo 2017: fig. 1B), epigastric region and ventral surface of abdomen not elevated (Seo 2017: fig. 1B), and has a strongly bent terminal hook on basal part of bulb (Seo 2017: fig. 1K). Females of the new species are similar to those of T. songyuae Tong & Li, 2018, but can be distinguished by the absence of the large dark knob marking in ventral surface of genital area (Tong et al. 2018: fig. 10H).

Figure 1. 

Trilacuna bawan sp. n., male. A–C habitus, dorsal, ventral and lateral views D–G prosoma, dorsal, ventral, lateral and anterior views H, I abdomen, ventral and lateral views. Abbreviations: boc = booklung covers; ehb = elevated hair base; gro = grooves; ldi = labium deep incision; mel = median elevation; wri = wrinkles. Scale bars: 0.4 mm.

Figure 2. 

Trilacuna bawan sp. n., left male palp. A prolateral view B, D, F distal part of palpal bulb, prolateral, dorsal and retrolateral views C, E palpal bulb, dorsal and retrolateral views. Abbreviations: blp = basal leaf-shaped projection; bth = basal thin “hairs”; dbh = dorsal brush of “hairs”; dth =distal thick “hairs”; lcb = lateral curved branch; lh = lateral “hairs”; lmb = long medial branch; vbl = ventral broad lobes.

Male. Body yellow-brown, chelicerae and sternum lighter, legs yellow. Habitus as in Fig. 1A–C. Body length 1.76; carapace 0.88 long, 0.74 wide; abdomen 0.97 long, 0.64 wide. Carapace sides granulate; lateral margin rebordered (Fig. 1D). Six eyes, well developed, nearly equal sized, arranged in a compact group; ALE–PLE separated by less than ALE radius, PME touching each other; posterior row recurved from above, procurved from front (Fig. 1D, G). ALE separated from edge of carapace by 1.1 diameters. Mouthparts (Figs 1E, G, 26A): chelicerae straight, proximal region with one hair with elevated hair base; labium rectangular, anterior margin deeply incised (ldi); endites slender, distally only slightly branched (sdb). Sternum surface smooth, with several grooves (gro) on posterior area (Fig. 1E). Abdomen as in Fig. 1I. Leg spination (all spines longer than segment width): legs I-II: tibia: v2-2-2-2-0, metatarsus: v2-2-0. Genitalia. Sperm pore situated at level of anterior spiracles; with several wrinkles (wri) between the posterior spiracles (Fig. 1H); epigastric region strongly elevated in lateral view, then followed by a narrow, slightly median elevation (mel) (Fig. 1I). Palp (Figs 2, 22A, B): orange. 0.46 long (0.19, 0.11, 0.12, 0.17). Femur 0.19 long, 0.13 wide (width/length = 0.68) (Fig. 22A, B). Tip of cymbium with long setae, almost as long as cymbium. Bulb oval, stout, tapering apically. Embolus system (Fig. 2B, D, F) with a leaf-shaped projection on base (blp) prolaterally; with a long medial branch (lmb) and a lateral curved branch (lcb) dorsally; all these structures surrounded by numerous hair-like structures.

Female. As in male except as noted. Habitus as in Fig. 3A–C. Slightly larger than male. Body length 1.89; carapace 0.85 long, 0.75 wide; abdomen 1.12 long, 0.73 wide. Endites unmodified; sternum without grooves on middle area; ventral side of abdomen unmodified. Genitalia. Ventral view (Figs 3G, 24A): with recurved, strongly sclerotized arches (sar) anterior to the spiracles. Dorsal view (Fig. 24B): with narrow, transverse sclerite (tsc); with an anterior T-shaped sclerite (as) and a posterior small globular structure (glo). Transverse bars (tba) nearly straight, with two short, lateral apodemes (ap).

Figure 3. 

Trilacuna bawan sp. n., female. A–C habitus, doral, ventral and lateral views D–F, H prosoma, dorsal, ventral, lateral and anterior views G abdomen, ventral view. Abbreviation: ldi = labium deep incision. Scale bars: 0.4 mm.

Known only from the type locality.

Holotype ♂ (SYNU-240), China, Yunnan Province, Baoshan City, Tengchong County, Jietou Town, Datang Village, Dahelingganjiao, 23.II.2011, Zongxu Li & Luyu Wang. Paratypes: 6♀, 1♂ (SYNU-241), same data as holotype; 1♂, 3♀ (SYNU-242), same locality as holotype, 21.II.2011; 1♂ (SYNU-243), same locality as holotype, 24.II.2011.

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

The new species is similar to T. rastrum Tong & Li, 2007, but males can be distinguished by the strongly elevated epigastric region (Fig. 4I), the long, very thick setae (lts) between the anterior spiracles (Fig. 4H) and 2 basal broad blade-like lobes (bll) and one long distal broad lobe (dbl) of embolus system (Fig. 5B), and the females by the smooth carapace and rugose surface of the sternum. Trilacuna rastrum males have flat epigastric region, without thick setae between the anterior spiracles, and have rake-like lobes of embolus system, and females have granulated sides of carapace and pitted surface of the sternum.

Figure 4. 

Trilacuna datang sp. n., male. A–C habitus, dorsal, ventral and lateral views D–G prosoma, dorsal, ventral, lateral and anterior views H, I abdomen, ventral and lateral views. Abbreviations: boc = booklung covers; ehb = elevated hair base; ldi = labium deep incision; lts = long, very thick setae; sis = short, italic thick setae; slh = small hole. Scale bars: 0.4 mm.

Figure 5. 

Trilacuna datang sp. n., left male palp. A prolateral view B, D, F distal part of palpal bulb, prolateral, dorsal and retrolateral views C, E palpal bulb, dorsal and retrolateral views. Abbreviations: bll = blade-like lobes; bth = basal thin “hairs”; dbe = distal bending; dbh = dorsal brush of “hairs”; dbl = distal broad lobe; dth = distal thick “hairs”; lcb = lateral curved branch; lh = lateral “hairs”; lmb = long medial branch; vbl = ventral broad lobes.

Male. Body yellow-brown, chelicerae and sternum lighter, legs yellow. Habitus as in Fig. 4A–C. Body length 1.87; carapace 0.89 long, 0.76 wide; abdomen 0.99 long, 0.72 wide. Carapace sides smooth, lateral margin rebordered (Fig. 4D). Eyes similar to those of T. bawan sp. n. (Fig. 4D, G). ALE separated from edge of carapace by 1.3 diameters. Mouthparts (Figs 4E, G, 26B) similar to those of T. bawan sp. n. Sternum surface smooth, with many short, italic thick setae (sis) on middle area (Fig. 4E). Abdomen as in Fig. 4I. Leg spination (all spines longer than segment width): legs I-II: tibia: v2-2-2-2-0, metatarsus: v2-2-0. Genitalia. Sperm pore situated in front of anterior spiracles; with four long, very thick setae (lts) between the anterior spiracles; with a small hole (slh) between the posterior spiracles (Fig. 4H); epigastric region strongly elevated (Fig. 4I) in lateral view. Palp (Figs 5, 22C, F): orange. 0.46 long (0.15, 0.08, 0.11, 0.12). Femur 0.15 long, 0.09 wide (width/length = 0.6) (Fig. 22C, F). Tip of cymbium with long setae, longer than cymbium. Bulb oval, stout, tapering apically. Embolus system (Fig. 5B, D, F) with 2 basal broad blade-like lobes (bll) and one long distal broad lobe (dbl) prolaterally, the tip of the distal lobe sharply bending (dbe); with a lateral curved branch (lcb) and a long medial branch (lmb) dorsally; with numerous brush of “hairs” (dbh) on dorsal branch and lateral “hairs” (lh) on small branches derived from the lateral curved branch (lcb).

Female. As in male except as noted. Habitus as in Fig. 6A–C. Body length 1.87; carapace 0.85 long, 0.74 wide; abdomen 1.09 long, 0.81 wide. Endites unmodified; sternum surface strongly rugose; ventral side of abdomen unmodified. Genitalia. Ventral view (Fig. 24C): with recurved, strongly sclerotized arches (sar) anterior to the spiracles; grooves connected posterior spiracles heavily sclerotized. Dorsal view (Fig. 24D): with narrow, transversally elongated sclerite (tsc); with an anterior T-shaped sclerite (as) and a posterior small globular structure (glo). Transverse bars (tba) slightly arched, with two short, lateral apodemes (ap).

Figure 6. 

Trilacuna datang sp. n., female. A–C habitus, dorsal, ventral and lateral views D–G prosoma, dorsal, ventral, lateral and anterior views. Abbreviation: ldi = labium deep incision. Scale bars: 0.4 mm.

Known only from the type locality.

Holotype ♂ (SYNU-250), China, Yunnan Province, Nujiang Lisu Autonomous Prefecture, Fugong County, Pihe Town, 11.III.2011, Zongxu Li & Luyu Wang. Paratypes: 1♀, 2♂ (SYNU-251), same data as holotype.

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

Males of the new species is similar to T. werni Eichenberger, 2011, but can be distinguished by the several rows of lobes on ventral groove (grl) of the bulb (Fig. 8C), the large distal plate (ldp) of embolus system (Fig. 8C), and the smooth carapace and sternum (Fig. 7D, E) vs. only one row of lobes in a venrtal groove without large distal plate on embolus system in T werni (Eichenberger and Kranz-Baltensperger 2011: fig. 12E‒F, I), and granulated carapace and reticulated sternum in T. werni (Eichenberger and Kranz-Baltensperger 2011: fig. 10D–G). Females of the new species can be distinguished from all other Trilacuna species by the horseshoe-shaped sclerite (hsc) of the endogyne (Fig. 24F), the females of all the known species have transversally elongated sclerite of the endogyne (e.g., Figs 24B, D, H, J, 25B, D).

Figure 7. 

Trilacuna fugong sp. n., male. A–C habitus, dorsal, ventral and lateral views D–G prosoma, dorsal, ventral, lateral and anterior views H, I abdomen, ventral and lateral views. Abbreviations: boc = booklung covers; ehb = elevated hair base; ldi = labium deep incision. Scale bars: 0.4 mm.

Figure 8. 

Trilacuna fugong sp. n., left male palp. A prolateral view B, D palpal bulb, prolateral and dorsal views C, E, F distal part of palpal bulb, prolateral, dorsal and retrolateral views. Abbreviations: dha = distal “hairs”; dmp = distal medial plate; grl = rows of lobes in basal ventral groove; lbh = long, brush of “hairs”; lcb = lateral curved branch; ldp = large distal plate.

Male. Body yellow, chelicerae, sternum and legs lighter. Habitus as in Fig. 7A–C. Body length 1.59; carapace 0.78 long, 0.64 wide; abdomen 0.86 long, 0.55 wide. Carapace sides smooth, lateral margin rebordered (Fig. 7D). Eyes: ALE largest, PME smallest (Fig. 7D, G). ALE separated from edge of carapace by approximately one diameter. Mouthparts as in Figs 7E, G, 26C, endites with a small distal projection (dpr). Sternum surface smooth (Fig. 7E). Abdomen as in Fig. 7I. Leg spination (all spines longer than segment width): legs I-II: tibia: v2-2-2-0, metatarsus: v2-2-0. Genitalia. Epigastric region sharply elevated from lateral view (Fig. 7I), sperm pore situated at level of anterior spiracles. Palp (Figs 8, 22D, E): orange. 0.46 long (0.15, 0.08, 0.11, 0.12). Femur 0.15 long, 0.09 wide (width/length = 0.6) (Fig. 22D, E). Cymbium without long setae. Bulb oval, stout, tapering apically. Embolus system (Fig. 8C, E, F) with rows of lobes in basal ventral groove (grl) and a large distal plate (ldp); with a distal medial plate (dmp) and a short lateral curved branch (lcb), surrounded by long, brush of “hairs” (lbh).

Female. As in male except as noted. Habitus as in Fig. 9A. Slightly larger than male. Body length 1.68; carapace 0.71 long, 0.63 wide; abdomen 1.01 long, 0.63 wide. Endites unmodified; epigastric region not sharply elevated from lateral view. Genitalia. Ventral view (Figs 9B, 24E): with recurved, strongly sclerotized arches (sar) anterior to the spiracles. Dorsal view (Fig. 24F): with an anterior stick-like sclerite (ssc) and a posterior horseshoe-shaped sclerite (hsc).

Figure 9. 

Trilacuna fugong sp. n., female. A habitus, dorsal view B, C abdomen, ventral and lateral views D–G prosoma, dorsal, ventral, lateral and anterior views. Abbreviations: boc = booklung covers; ldi = labium deep incision; psp = posterior spiracle; sar = sclerotized, recurved arches. Scale bars: 0.4 mm.

Known only from the type locality.

Holotype ♂ (SYNU-257), China, Yunnan Province, Nujiang Lisu Autonomous Prefecture, Gongshan County, Bingzhongluo Town, 28°00'866"N, 98°35'953"E, 1840 m, 11.III.2011, Zongxu Li & Guchun Zhou. Paratypes: 6♀, 4♂ (SYNU-258), same data as holotype; 2♀, 1♂ (SYNU-259), same locality as holotype, 8.III.2011, Zongxu Li & Luyu Wang.

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

The new specie is similar to T. rastrum Tong & Li, 2007, but can be distinguished by the presence of three pairs of spines on male tibiae I and II, the leaf-shaped projection (blp) and three long, tooth-like lobes (tll) on the embolus system (Fig. 11B, D), and the several longitudinal wrinkles on sternum surface of female. Trilacuna rastrum has four pairs of ventral spines on male tibiae I and II, lacking the leaf-shaped projection, has a rake-shaped lobes on the embolus system, and has a pitted surface on sternum of female (Tong and Li 2007: fig. 7–10).

Male. Body yellow-brown, chelicerae and sternum lighter, legs yellow. Habitus as in Fig. 10A–C. Body length 1.89; carapace 0.88 long, 0.74 wide; abdomen 1.08 long, 0.68 wide. Carapace sides granulate, lateral margin rebordered (Fig. 10D). Eyes: ALE separated from edge of carapace by 1.4 diameters (Fig. 10D, G). Mouthparts (Figs 10E, G, 26D) similar to those of T. bawan sp. n. Sternum surface smooth, with finely setae (Fig. 10E). Abdomen as in Fig. 10I. Leg spination (all spines longer than segment width): legs I-II: tibia: v2-2-2-0, metatarsus: v2-2-0. Genitalia. Sperm pore situated at level of anterior spiracles; with a small hole (slh) between the posterior spiracles (Fig. 10H). Palp (Figs 11, 23A, B): orange. 0.46 long (0.15, 0.08, 0.11, 0.12). Femur 0.15 long, 0.09 wide (width/length = 0.6) (Fig. 23A, B). Cymbium without long seta. Bulb oval, stout, tapering apically. Embolus system (Fig. 11B, D, F) with a leaf-shaped projection (blp) and three long, tooth-like lobes (tll) prolaterally; with a lateral curved branch (lcb) and a long medial branch (lmb) dorsally; with numerous brush of “hairs”(dbh) surrounded medial branch and lateral “hairs” (lh) on lateral curved branch (lcb).

Figure 10. 

Trilacuna gongshan sp. n., male. A–C habitus, dorsal, ventral and lateral views D–G prosoma, dorsal, ventral, lateral and anterior views H, I abdomen, ventral and lateral views. Abbreviations: boc = booklung covers; ehb = elevated hair base; ldi = labium deep incision; slh = small hole. Scale bars: 0.4 mm.

Figure 11. 

Trilacuna gongshan sp. n., left male palp. A prolateral view B, D, F distal part of palpal bulb, prolateral, dorsal and retrolateral views C, E palpal bulb, dorsal and retrolateral views. Abbreviations: blp = basal leaf-shaped projection; bth = basal thin “hairs”; dbh = dorsal brush of “hairs”; dsh = distal short “hairs”; dth = distal thick “hairs”; lcb = lateral curved branch; lh = lateral “hairs”; lmb = long medial branch; tll = tooth-like lobes.

Female. As in male except as noted. Habitus as in Fig. 12A–C. Slightly larger than male. Body length 1.92; carapace 0.81 long, 0.72 wide; abdomen 1.18 long, 0.72 wide. Endites unmodified; sternum surface smooth, but medially with several longitudinal wrinkles. Genitalia. Ventral view (Fig. 24G): with recurved, strongly sclerotized arches (sar) anterior to the spiracles. Dorsal view (Fig. 24H): with narrow, transversally elongated sclerite (tsc); with an anterior T-shaped sclerite (as) and a posterior small globular structure (glo). Transverse bars (tba) straight, with two short, lateral apodemes (ap).

Figure 12. 

Trilacuna gongshan sp. n., female. A–C habitus, dorsal, ventral and lateral views D–G prosoma, dorsal, ventral, lateral and anterior views. Abbreviation: ldi = labium deep incision. Scale bars: 0.4 mm.

Known only from the type locality.

Holotype ♂ (SYNU-244), China, Yunnan Province, Baoshan City, Longling County, Xiaoheishan Natural Reserve, 17.II.2011, Zongxu Li & Luyu Wang. Paratypes: 2♀, 2♂ (SYNU-247), same data as holotype; 2♀ (SYNU-246), same data as holotype; 1♂ (SYNU-261), same data as holotype.

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

The new species is similar to T. wuhe sp. n., but can be distinguished by the narrow, blade-like lobes (bll) on embolus system (Fig. 14B, D, F), and the straight transversal sclerite (tsc) of the endogyne (Fig. 24J). T. wuhe sp. n. has 4 long, finger-like lobes (fll) and a cluster of long, thick “hairs” (lth) on embolus system (Fig. 17B) and has an “angled” transversal sclerite (tsc) of the endogyne (Fig. 25A).

Male. Body yellow-brown, chelicerae and sternum lighter, legs yellow. Habitus as in Fig. 13A–C. Body length 1.69; carapace 0.81 long, 0.71 wide; abdomen 0.92 long, 0.71 wide. Carapace sides smooth, with only a few granulates, lateral margin rebordered (Fig. 13D). Eyes: ALE largest, PME smallest (Fig. 13D, G). ALE separated from edge of carapace by 1.2 diameters. Mouthparts as in Figs 13E, G, 26E. Sternum surface smooth, medial area strongly rugose, with many rows of small ridges (sri) on posterior area (Fig. 13E). Abdomen as in Fig. 13I. Leg spination (all spines longer than segment width): legs I-II: tibia: v2-2-2-2-0, metatarsus: v2-2-0. Genitalia. Sperm pore situated at level of anterior spiracles; with a small hole (slh) between the posterior spiracles, surrounded by some long hairs (lha) (Fig. 13H). Palp (Figs 14, 23C, D): orange. 0.46 long (0.15, 0.08, 0.11, 0.12). Femur 0.15 long, 0.09 wide (width/length = 0.6) (Fig. 23C, D). Bulb oval, stout, tapering apically. Embolus system (Fig. 14B, D, F) with a leaf-shaped prolateral projection at base (blp), projection with numerous thin, short “hairs” at the margin (bth); with two narrow, blade-like lobes (bll); with a retrolateraly curved branch (lcb) and a long medial branch (lmb), the former (lcb) with a cluster of lateral “hairs” (lh), the latter (lmb) covered by numerous dorsal “hairs” (dbh); with rows of ventral broad lobes (vbl) retrolaterally.

Figure 13. 

Trilacuna longling sp. n., male. A–C habitus, dorsal, ventral and lateral views D–G prosoma, dorsal, ventral, lateral and anterior views H, I abdomen, ventral and lateral views. Abbreviations: boc = booklung covers; ehb = elevated hair base; ldi = labium deep incision; lha = long hairs; slh = small hole; sri = small ridges. Scale bars: 0.4 mm.

Figure 14. 

Trilacuna longling sp. n., left male palp. A prolateral view B, D, F distal part of palpal bulb, prolateral, dorsal and retrolateral views C, E palpal bulb, dorsal and retrolateral views. Abbreviations: bll = blade-like lobes; blp = basal leaf-shaped projection; bth = basal thin “hairs”; dbh = dorsal brush of “hairs”; dth = distal thick “hairs”; lcb = lateral curved branch; lh = lateral “hairs”; lmb = long medial branch; vbl = ventral broad lobes.

Female. As in male except as noted. Habitus as in Fig. 15A–C. Slightly larger than male. Body length 1.76; carapace 0.78 long, 0.67 wide; abdomen 1.01 long, 0.75 wide. Endites unmodified; sternum without rows of small ridges (sri) on posterior area. Genitalia. Ventral view (Fig. 24I): with recurved, strongly sclerotized arches (sar) anterior to the spiracles. Dorsal view (Fig. 24J): with narrow, transversally elongated sclerite (tsc); with an anterior T-shaped sclerite (as) and a posterior small globular structure (glo). Transverse bars (tba) with two short, lateral apodemes (ap).

Figure 15. 

Trilacuna longling sp. n., female. A–C habitus, dorsal, ventral and lateral views D–G prosoma, dorsal, ventral, lateral and anterior views. Abbreviations: ldi = labium deep incision. Scale bars: 0.4 mm.

Known only from the type locality.

Holotype ♂ (SYNU-255), China, Yunnan Province, Baoshan City, Tengchong County, Wuhe Town, Xiaodifang Village, 27.II.2011, Zongxu Li & Luyu Wang. Paratypes: 3♀, 1♂ (SYNU-256), same data as holotype.

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

The new species is similar to T. xinping sp. n., but males can be distinguished by the numerous rows of small ridges (sri) in posterior part of sternum (Fig. 16E), four long, finger-like lobes (fll) and a cluster of long, thick “hairs” (lth) on embolus system (Fig. 17B), and the females by the “angled” transversal sclerite (tsc) of the endogyne (Fig. 25A). Trilacuna xinping sp. n. males have a cluster of short setae (css) in posterior part of sternum (Fig. 19E), comb-shaped lobes (csl) on embolus system (Fig. 20B), and females there is no the transversal sclerite (tsc) (Fig. 25C).

Male. Body yellow-brown, chelicerae and sternum lighter, legs yellow. Habitus as in Fig. 16A–C. Body length 1.62; carapace 0.82 long, 0.69 wide; abdomen 0.84 long, 0.64 wide. Carapace sides granulate, lateral margin rebordered (Fig. 16D). Eyes: ALE separated from edge of carapace by 1.2 diameters (Fig. 16D, G). Mouthparts as in Figs 16E, G, 26F. Sternum smooth, with many rows of small ridges (sri) on posterior area (Fig. 16E). Abdomen as in Fig. 16I. Leg spination (all spines longer than segment width): legs I-II: tibia: v2-2-2-2-0, metatarsus: v2-2-0. Genitalia. Sperm pore situated at level of anterior spiracles; with cluster of long hairs (clh) between the posterior spiracles (Fig. 16H). Palp (Figs 17, 22G–I): orange. 0.46 long (0.15, 0.08, 0.11, 0.12). Femur 0.15 long, 0.09 wide (width/length = 0.6) (Fig. 22G, I). Bulb oval, stout, tapering apically. Embolus system (Fig. 17B, D, F) with four long, finger-like lobes (fll), two distal broad lobes (dbl), and a cluster of long, thick “hairs” (lth) prolaterally; with a retrolateral curved branch (lcb) and a long medial branch (lmb) dorsally, all these structures surrounded by numerous hair-like structures.

Figure 16. 

Trilacuna wuhe sp. n., male. A–C habitus, dorsal, ventral and lateral views D–G prosoma, dorsal, ventral, lateral and anterior views H, I abdomen, ventral and lateral views. Abbreviations: boc = booklung covers; clh = cluster of long hairs; ehb = elevated hair base; ldi = labium deep incision; sri = small ridges. Scale bars: 0.4 mm.

Figure 17. 

Trilacuna wuhe sp. n., left male palp. A prolateral view B, D, F distal part of palpal bulb, prolateal, dorsal and retrolateral views C, E palpal bulb, dorsal and retrolateral views. Abbreviations: bth = basal thin “hairs”; dbh = dorsal brush of “hairs”; dbl = distal broad lobe; fll = finger-like lobes; lcb = lateral curved branch; lh = lateral “hairs”; lmb = long medial branch; lth = long thick “hairs”.

Female. As in male except as noted. Habitus as in Fig. 18A–C. Slightly larger than male. Body length 1.81; carapace 0.79 long, 0.69 wide; abdomen 1.05 long, 0.75 wide. Endites unmodified; sternum surface slightly rugose on middle area, without rows of small ridges (sri) on posterior area. Genitalia. Ventral view (Fig. 25A): with recurved, strongly sclerotized arches (sar) anterior to the spiracles. Dorsal view (Fig. 25B): with narrow, nearly “angled” transversally elongated sclerite (tsc); with an anterior T-shaped sclerite (as) and a posterior small globular structure (glo). Transverse bars (tba) with two short, lateral apodemes (ap).

Figure 18. 

Trilacuna wuhe sp. n., female. A–C habitus, dorsal, ventral and lateral views D–G prosoma, dorsal, ventral, lateral and anterior views. Abbreviation: ldi = labium deep incision. Scale bars: 0.4 mm.

Known only from the type locality.

Holotype ♂ (SYNU-248), China, Yunnan Province, Yuxi City, Xinping County, Ailaoshan Natural Reserve, on the roadside from Jinshan bealock to the Ancient Tea Horse Road, 23°56'967"N, 101°30'270"E, 2283 m, 19.V.2011, Zongxu Li & Guchun Zhou. Paratypes: 5♀ (SYNU-249), same data as holotype.

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

The new species is similar to T. rastrum Tong & Li, 2007, but males can be distinguished by the cluster of short setae (css) on posterior part of sternum (Fig. 19E), and the kidney-shaped palpal bulb (Fig. 23E, G), and the females by the absence of the transverse sclerite (tsc) of endogyne (Fig. 25D). T. rastrum males are lacking cluster of short setae on posterior part of sternum, and have pear shaped palpal bulb, and the females have the transverse sclerite (Tong and Li 2007: figs 6–10).

Figure 19. 

Trilacuna xinping sp. n., male. A–C habitus, dorsal, ventral and lateral views D–G prosoma, dorsal, ventral, lateral and anterior views H, I abdomen, ventral and lateral views. Abbreviations: boc = booklung covers; css = cluster of short setae; ddo = dark dot; ldi = labium deep incision; rls = rows of long setae. Scale bars: 0.4 mm.

Male (Holotype). Body yellow-brown, chelicerae and sternum lighter, legs yellow. Habitus as in Fig. 19A–C. Body length 1.74; carapace 0.81 long, 0.69 wide; abdomen 0.93 long, 0.64 wide. Carapace sides granulate. Eyes: ALE largest, PME smallest (Fig. 19D, G). ALE separated from edge of carapace by 1.1 diameters. Mouthparts as in Figs 19E, G, 26G. Sternum reticulated, with a cluster of short setae (css) posteriorly (Fig. 19E). Abdomen as in Fig. 19I. Leg spination (all spines longer than segment width): legs I-II: tibia: v2-2-2-2-0, metatarsus: v2-2-0. Genitalia. Sperm pore situated in front of anterior spiracles; with a small dark dot (ddo) between anterior and posterior spiracles, surrounded by rows of long setae (rls) (Fig. 19H, I). Palp (Figs 20, 23E–G): orange. Tip of cymbium with long setae, almost as long as cymbium. Bulb kidney-shaped. Embolus system (Fig. 20B, D, F), with ear-shaped projection at base (bep) and comb-shaped prolateral lobes (csl); with a lateral curved branch (lcb) and broad medial branch (bmb), the former (lcb) with a cluster of lateral “hairs” (lh), the latter (bmb) covered by numerous dorsal “hairs” (dbh).

Figure 20. 

Trilacuna xinping sp. n., left male palp. A prolateral views B, D, F distal part of palpal bulb, prolateral, dorsal and retrolateral views C, E palpal bulb, dorsal and retrolateral views. Abbreviations: bep = basal ear-shaped projection; bmb = broad medial branch; csl = comb-shaped lobes; dbh = dorsal brush of “hairs”; lcb = lateral curved branch; lh = lateral “hairs”.

Female. As in male except as noted. Habitus as in Fig. 21A–C. Slightly larger than male. Body length 1.91; carapace 0.81 long, 0.74 wide; abdomen 1.16 long, 0.76 wide. Endites unmodified; sternum without cluster of short setae on posterior area; ventral side of abdomen not elevated from lateral view. Genitalia. Ventral view (Fig. 25C): with recurved, strongly sclerotized arches (sar) anterior to the spiracles. Dorsal view (Fig. 25D): with an anterior T-shaped sclerite (as) and a posterior small globular structure (glo). Transverse sclerite (tsc) absent, transverse bars (tba) strongly arched, with two short, lateral apodemes (ap).

Figure 21. 

Trilacuna xinping sp. n., female. A–C habitus, dorsal, ventral and lateral views D–G prosoma, dorsal, ventral, lateral and anterior views. Abbreviation: ldi = labium deep incision. Scale bars: 0.4 mm.

Figure 22. 

Trilacuna spp., male left palp. A, B Trilacuna bawan sp. n. C, F Trilacuna datang sp. n. D, E Trilacuna fugong sp. n. G–I Trilacuna wuhe sp. n. A, C, D, G prolateral views B, E, F, I retrolateral view H dorsal view. Scale bars: 0.2 mm.

Figure 23. 

Trilacuna spp., male left palp. A, B Trilacuna gongshan sp. n. C, D Trilacuna longling sp. n. E–G Trilacuna xinping sp. n. A, C, E prolateral views B, D, G retrolateral view F dorsal view. Scale bars: 0.2 mm.

Figure 24. 

Trilacuna spp., female genitalia, ventral views. A, B Trilacuna bawan sp. n. C, D Trilacuna datang sp. n. E, F Trilacuna fugong sp. n. G, H Trilacuna gongshan sp. n. I, J Trilacuna longling sp. n. Abbreviations: ap = apodeme; as = anterior sclerite; glo = globular structure; hsc = horseshoe-shaped sclerite; psp = posterior spiracle; sar = sclerotized, recurved arches; ssc = stick-like sclerite; tba = transverse bars; tsc = transverse sclerite. Scale bars: 0.1 mm.

Figure 25. 

Trilacuna spp., female genitalia, ventral views. A, B Trilacuna wuhe sp. n. C, D Trilacuna xinping sp. n. Abbreviations: ap = apodeme; as = anterior sclerite; glo = globular structure; psp = posterior spiracle; sar = sclerotized, recurved arches; tba = transverse bars; tsc = transverse sclerite. Scale bars: 0.1 mm.

Figure 26. 

Trilacuna spp., male endites, ventral views. A Trilacuna bawan sp. n. B Trilacuna datang sp. n. C Trilacuna fugong sp. n. D Trilacuna gongshan sp. n. E Trilacuna longling sp. n. F Trilacuna wuhe sp. n. G Trilacuna xinping sp. n. Abbreviations: dpr = distal projection; sdb = slightly curved distal branch. Scale bars: 0.1 mm.

Known only from the type locality.