Bioacoustics of Latouchia jinyun

Redescription. Male ( HAL-2023-139 , Figs 2 F , 3 F ). Carapace yellowish brown. Cephalic region smoothly elevated. Eight eyes in two rows: anterior row procurved, posterior row straight. Chelicerae dark brown without stridulatory ridges, promargin with five teeth, retromargin with three teeth. Fovea procurved and deep. Sternum yellow with obvious glabrous sigilla. Labium and maxillae brown, without cuspule (Fig. 3 F ). Opisthosoma brownish-black with regular light blotches. Measurements: BL 9.64, CL 4.62 CW 4.23, OL 4.18, OW 3.21; Eye group, EL 0.51, AR 0.82, PR 0.98, AME - AME 0.11, AME 0.14, PME - PME 0.33, PME 0.11, ALE 0.30, PLE 0.28; MaxL 1.65, LL 0.56, LW 0.74; SL 2.80, SW 2.58; leg I 14.42 (4.46, 2.32, 3.13, 2.88, 1.63), leg II 13.09 (4.01, 2.27, 2.50, 2.67, 1.64), leg III 11.05 (2.97, 1.87, 1.49, 2.83, 1.89), leg IV 15.61 (4.31, 2.07, 3.23, 3.77, 2.23). Patellae and tibiae of legs I and II with stout spines; spines on tibiae II slightly thicker than those on tibiae I, most spines on tibiae II bearing hooked tips (Fig. 13 I, J ). Palp. Palpal bulb simple and pyriform in prolateral view; embolus thick at the base, tapering to slender apex and curved at one-third of its length from hook-shaped tip; both prolateral and retrolateral superior keels present (Fig. 11 A – I ). Female ( HAL-2023-122 , Figs 2 L , 3 L ). Carapace yellowish brown. Cephalic region elevated. Eyes in two rows: anterior row procurved, posterior row straight. Chelicerae dark brown without stridulatory ridges, promargin with five teeth, retromargin with three teeth. Fovea procurved and deep. Sternum brown with obvious glabrous sigilla. Labium and maxillae brown, labium with one cuspule, two maxillae together with 61 cuspules along proximal edge (Fig. 3 L ). Opisthosoma brownish-black with regular light blotches. Measurements: BL 13.44, CL 5.39 CW 4.67, OL 6.69, OW 4.63; Eye group, EL 0.79, AR 0.91, PR 0.96, AME - AME 0.13, AME 0.14, PME - PME 0.34, PME 0.12, ALE 0.32, PLE 0.30; MaxL 2.41, LL 0.84, LW 1.06; SL 3.35, SW 3.18; palp 8.37 (3.01, 1.44, 1.87, 2.05), leg I 11.12 (3.81, 2.31, 2.46, 1.41, 1.13), leg II 10.02 (3.34, 2.05, 1.93, 1.44, 1.26), leg III 8.85 (2.93, 1.95, 1.14, 1.46, 1.37), leg IV 13.40 (3.97, 2.34, 2.64, 2.64, 1.81). Vulva. Paired spermathecae inclined inward, with distinct constriction between lobes and inwardly curved stalks; surfaces densely covered with glandular pores on both elliptical lobes and most of stalks (Fig. 12 A – L ).

Description Male ( Holotype , MHBU-ARA- 10000049). Colouration in ethanol (Fig. 5 A). Carapace and chelicerae dark yellow, with eye mound, fovea and outer edge of carapace darker. Legs similar in colour to carapace, with femora gradually transitioning to slightly deeper hue from proximal to distal, darker than rest of legs. Opisthosoma: Dorsal side brownish-grey, with horizontal dark pattern; ventral side yellowish; booklung covers yellower than rest of ventral areas (Fig. 5 C). Colour difference between sigilla and rest of sternum unconspicuous. Total length 11.15. Carapace 5.06 long, 4.78 wide; opisthosoma 6.07 long, 3.98 wide. Eye group 0.61 long, 0.44 wide anteriorly, 0.67 wide posteriorly; MOA 0.42 long, front width 0.25, back width 0.41. Eye diameters and interdistance: AME 0.12, ALE 0.30, PME 0.13, PLE 0.25, AME – AME 0.12, AME – ALE 0.14, ALE – PLE 0.15, PME – PME 0.29, PME – PLE 0.03. Palpal coxa 1.72 long, 0.91 wide, without spinule on prolateral-proximal corner. Sternum 3.03 long, 2.75 wide. Labium 0.56 long, 0.99 wide, without cuspule or spinule. Chelicerae without stridulatory ridges; rastellum of left and right chelicerae carries 10 and nine stout spines, respectively; chelicerae groove with 5 / 4 and 3 / 3 teeth of different sizes on promargin and retromargin, respectively. Leg formula 4123; measurements: I 12.71 (2.46, 2.11, 3.30, 3.02, 1.82), II 11.36 (2.45, 1.94, 2.61, 2.80, 1.56), III 11.22 (3.34, 1.37, 1.69, 2.68, 2.14), IV 14.74 (4.18, 2.03, 3.46, 3.26, 1.81). Spines on femora to metatarsi of legs I – II straight, sword-like (typical); strong spines on the prolateral patellae of leg II, none on leg I, both ventrally with few typical; spines on prolateral tibiae of legs I – II often short, straight, mostly with hooked tip, much more numerous and stouter on leg II than leg I, ventrally more elongate on both legs, either straight or slightly curved (Fig. 6 D and Fig. 16 d ). Tarsi I – IV spineless. Spination of leg I, patellae, Drv (2) / (1), Dpd (0) / (1); Dpv (1) / (2); tibiae, Dp (1-2) / (1-1 - 1 - 2), pv (2-1 - 2 - 2) / (1-1 - 1 - 1 - 3 - 1), rv (1-1 - 1 - 1 - 2) / (1-1 - 1 - 2 - 1); metatarsi, Dpv (1-1) / (1-1), rl (1-1 - 1) / (1-1 - 1 - 1). Spination of leg II, patellae, Dpd (2) / (1), Dpv (1) / (1); tibiae, pl (1-3 - 1 - 2 - 2 - 2 - 1 - 1 - 1 - 1) / (1-2 - 2 - 3 - 3 - 2 - 2), pv (1-1 - 1 - 1 - 1 - 3) / (1-1 - 1 - 1 - 1 - 3), rv (1-1 - 1 - 1) / (1-1 - 1); metatarsi, Mp (1-2) / (1), Dpv (1) / (1), rv (2-1 - 1 - 1) / (1-1 - 1 - 1). Tibia III unmodified, without demi-saddle shape. Trichobothria of legs present on proximal one-third part of tibiae I – III, proximal one – fourth part of tibia IV, distal half of metatarsi I – III, distal two-thirds part of metatarsus IV and dorsal side of all tarsi; trichobothria on tibiae I – IV and metatarsi I – IV unmodified; trichobothria on tarsi divided into unmodified and clavate forms, with former irregularly distributed across almost entire dorsal surface and latter only present in proximal half. Count of trichobothria on legs: I, tibia 4 / 5 pd and 4 / 5 rd, metatarsus 7 / 7, tarsus 14 / 19 unmodified and 5 / 5 clavate; II, tibia 5 / 5 pd and 6 / 5 rd, metatarsus 8 / 7, tarsus 16 / 11 unmodified and 3 / 3 clavate; III, tibia 5 / 5 pd and 5 / 4 rd, metatarsus 6 / 7, tarsus 15 / 14 unmodified and 3 / 5 clavate; IV, tibia 5 / 5 pd and 6 / 6 rd, metatarsus 7 / 6, tarsus 10 / 8 unmodified and 2 / 1 clavate. Tarsal claws: paired claws with five teeth in different sizes on tarsi I – IV (Fig. 6 F); unpaired claw of tarsus I split into two branches; tarsi II – IV unpaired claw bare, without denticle. Palp 6.48 long (2.41, 1.20, 1.97, 0.90). Trichobothria on palpal tibia unmodified, present on proximal one-third part, on cymbium divided into unmodified and clavate forms, with latter occupying majority of trichobothrial area, while former sparsely distributed at distal end of trichobothrial area; count of trichobothria: tibia 3 / 3 pd, 3 / 3 rd, cymbium 5 / 4 unmodified and 4 / 6 clavate. Tibia tubby, slightly diminution from proximal to distal, with one lyriform organ on ventro-prolateral side of sub-distal part; tibia lacks spine or spinule (Fig. 5 E – F). Palpal organ: tegulum oval (Fig. 5 G); embolus long, approximately 1.5 times the width of tegulum, the distal one-third portion of the embolus is obviously bent, forming the embolus into a hook-shaped structure, with one transparent elevated embolic keel extending from distal one-fourth of embolus to apex; apex of embolus with retrolateral superior keel and prolateral superior keel (Fig. 5 H and Fig. 6 B). Female ( Paratype , MHBU-ARA- 10000050). Colouration in ethanol (Fig. 5 B). Carapace darker than male, eye mound and fovea dark; area between eye mound and fovea with two slightly lighter longitudinal colour patches; chelicerae similar in colour to carapace. Colour between palp and each leg without significant difference, overall similar in colour to carapace. Opisthosoma: dorsal side as in male; ventral side brighter than dorsal side (Fig. 5 D); sigilla slightly darker than rest of sternum; chelicerae ventrally more reddish than male. Total length 12.97. Carapace 5.53 long, 4.43 wide; opisthosoma 7.43 long, 4.81 wide. Eye group 0.54 long, 0.46 wide anteriorly, 0.60 wide posteriorly; MOA 0.51 long, front width 0.25, back width 0.41. Eye diameters and interdistance: AME 0.15, ALE 0.29, PME 0.15, PLE 0.25, AME – AME 0.12, AME – ALE 0.05, ALE – PLE 0.10, PME – PME 0.29, PME – PLE 0.03, MOA 0.43 long, front width 0.21, back width 0.41. Palpal coxa 1.93 long, 1.23 wide, bearing 44 / 39 cuspules on prolateral-proximal corner. Sternum 3.09 long, 2.83 wide. Labium 0.76 long, 1.16 wide, with two spinules and one cuspule. Chelicerae without stridulatory ridges; rastellum of left and right chelicerae carrying 11 and nine stout spines, respectively; chelicerae groove with 5 / 5 and 3 / 3 teeth of different sizes on promargin and retromargin, respectively. Leg formula 4123; measurements: I 8.95 (3.25, 1.22, 2.19, 1.27, 1.02), II 8.57 (3.00, 1.57, 1.69, 1.27, 1.04), III 7.54 (2.73, 1.12, 0.93, 1.42, 1.34), IV 15.53 (3.67, 1.58, 2.39, 1.98, 1.74). Spines of legs I – II primarily distributed on p, pd, r and rv of tibia, as well as p, pv, r and rv of metatarsus and tarsus; most spine tips weakly curved downwards, forming slight hook-shape; some spines on rv longer and not curved at tip. Leg III strong; tibia III shortened, without demi-saddle shape. Groups of short spines on apical and prodorsal sides of patella and dorso-lateral side of tibia; metatarsus with spines grouped in dorso-lateral area. Patella with dorso-proximal group of short stiff bristles on leg IV. Trichobothria of legs present on proximal one-third part of tibiae I – IV, distal half of metatarsi I – IV and proximal two-thirds of all tarsi; trichobothria on tibiae I – IV and metatarsi I – IV unmodified; trichobothria on tarsi divided into unmodified and clavate forms, with latter only present in proximal half of tarsus. Count of trichobothria on legs: I, tibia 4 / 4 pd and 5 / 4 rd, metatarsus 7 / 5, tarsus 10 / 11 unmodified and 6 / 6 clavate; II, tibia 5 / 5 pd and 5 / 5 rd, metatarsus 7 / 7, tarsus 10 / 10 unmodified and 5 / 6 clavate; III, tibia 5 / 5 pd and 5 / 6 rd, metatarsus 7 / 6, tarsus 9 / 10 unmodified and 2 / 4 clavate; IV, tibia 7 / 5 pd and 5 / 6 rd, metatarsus 7 / 7, tarsus 9 / 7 unmodified and 1 / 2 clavate. Tarsal claws: all paired claws with one tooth (Fig. 6 E); unpaired claw bare, without denticle. Palp 8.29 long (2.55, 1.72, 1.93, 2.09), spines on palp distributed on p, pv, r and rv of tibia and tarsus; palpal tarsal claw with one basal tooth. Vulva (Fig. 5 I and Fig. 6 C). Two separate sperm receptacles connected to atrium via slightly outwardly inclined stalk; the distal half of the outer edge of stalk tilts approximately 45 ° towards the body axis.