Bioacoustics of Wirada mexicana

Description. Male holotype . Color : carapace, labium, endites, sternum and chelicerae red-fulvous, concolorous ( Figs 10, 14–15 ). Dorsal opisthosomal scutum chestnut, with the sigilla surrounded by darker circular spots, four centrals bigger than laterals ( Fig. 10 ). Ventral scutum as carapace ( Figs 14–15 ). Lateral areas light brown, with the sigilla fulvous ( Fig. 14 ). Spinnerets and ring around them fulvous ( Fig. 15 ). Legs fulvous darker on the distal segments. Palp light fulvous, with embolus black ( Figs 11–13 ). Habitus: Total length 1.55. Carapace 0.61 long, 0.52 width, with chitinous setiferous bridges arranged longitudinally in the middle and diagonally on lateral areas ( Figs 2, 10 ). Carapace with prosomal stridulatory ridges on its posterior border ( Fig. 6 ). Ocular area with a few simple setae ( Fig. 2 ). Eye sizes and interdistances: AME 0.06, ALE 0.046, PME 0.052, PLE 0.052, AME-AME 0.017, AME-ALE 0.009, PME-PME 0.06, PME-PLE 0.017. AER and PER almost straight ( Figs 2, 14–15 ). Clypeus 0.20 high. Cheliceral promargin with a bicuspid tooth. Endites 0.21 long, 0.13 width. Labium 0.06 long, 0.17 width. Sternum 0.33 long, 0.39 width, convex, with chitinous setiferous bridges, intercoxal sclerites present, posterior edge nearly straight, extended beyond of coxae IV, about half as wide as anterior border ( Fig. 15 ). Opisthosoma 0.94 long, 0.85 width, circular in dorsal view. Dorsal scutum microsculptured with backward directed setae ( Fig. 3 ) and twelve conspicuous circular sigilla, four at central area and eight around these ( Figs 3, 10 ). Ventral scutum surrounding pedicel and covering epigastrium with chitinous setiferous bridges, book lung plates visible ( Figs 1, 14–15 ); stridulatory nubbins at pedicel base ( Fig. 4 ); spinnerets surrounded by four sclerotized plates, anterior and posterior bigger than laterals, forming a ring ( Fig. 14–15 ). Membranous area between ventral and dorsal scuta with sputtered oval sigilla and sclerotized setal bases ( Fig. 14 ). Legs measurements : Femora I 0.45, II 0.43, III 0.37, IV 0.44. Patella I 0.17, II 0.17, III 0.15, IV 0.19. Tibiae I 0.27, II 0.26, III 0.24, IV 0.28. Metatarsi I 0.25, II 0.23, III 0.22, IV 0.24. Tarsi I 0.26, II 0.26, III 0.23, IV 0.28. Palp : Tibia goblet-shaped ( Figs. 8, 12 ), cymbium oval, convex ( Fig. 9, 13 ); tegulum convex occupying the proximal two thirds of bulb ( Figs. 7–9 ); theridioid tegular apophysis embedded in the tegulum, spreading to less of distal half (between tibia and median apophysis) ( Figs. 8, 12 ). Median apophysis distal to tegulum, transverse, u-shaped, partially encircling the embolus base to reach the cymbial hook dorso-ectal to embolus base ( Figs 5, 7–8 ); tip of prolateral process of median apophysis truncated, not surpassing the cymbium distal border, lightly sclerotized ( Figs 7, 12 ); retrolateral process of median apophysis inconspicuous, crest-shaped, hyaline ( Figs 8, 12 ). Embolus straight and cylindrical, its length about three and a half times as wide at its base, its tip opening oblique, partially hyaline and with a small orifice near its tip ( Figs 5, 7–9, 11–13 ). Female allotype . Color : as holotype , except dorsal scutum, pallid yellowish with chestnut spots on sigilla ( Figs 16–17 ). Habitus: Total length 1.62. Carapace 0.64 long, 0.52 width, with chitinous setiferous bridges arranged as holotype . Ocular area with few simple setae ( Fig. 16 ). Eye sizes and interdistances: AME 0.07, ALE: 0.043, PME 0.052, PLE 0.052, AME-AME 0.013, AME-ALE 0.009, PME-PME 0.06, PME-PLE 0.023. AER and PER almost straight ( Figs 16–17 ). Clypeus 0.11 high. Cheliceral promargin with a bicuspid tooth. Endites 0.20 long, 0.12 wide. Labium 0.08 long, 0.16 width. Sternum 0.31 long, 0.41 width, shape and texture as holotype ( Fig. 18 ). Opisthosoma 0.98 long, 0.98 width, shape and structure as holotype ( Fig. 16 ). Sclerotized ring of spinnerets as holotype , except anterior plate narrower. Dorsal scutum with fourteen conspicuous circular sigilla, four at central area and ten around these ( Fig. 16 ). Ventral scutum divided in four plates ( Figs 17–18 ), one dorsal to pedicel, covered with chitinous setiferous bridges ( Fig. 17 ), tree others on the epigastrium, one surrounding the epigynal plate and two laterals encircling the book lungs plates ( Figs 17–18 ). Legs measurements : Femur I 0.51, II 0.46, III 0.37, IV 0.45. Patella I 0.17, II 0.17, III 0.17, IV 0.17. Tibia I 0.27, II 0.24, III 0.21, IV 0.33. Metatarsi I 0.21, II 0.15, III 0.17, IV 0.23. Tarsi I 0.29, II 0.19, III 0.23, IV 0.29. Epigynum with a sclerotized labium projected ventrally from posterior border of atrium ( Figs 17–21 ). Copulatory openings separated from labium of epigynum by about two times their diameter, separated by a septum that has a rear transverse bar ( Figs 19, 21 ). Copulatory ducts short, laterally directed, forming a short arc before enter the spermathecae at their anterior border and slightly anterior to fertilization ducts insertions. Variation. Males (n = 12): total length 1.1–1.3; carapace length 0.61–0.68; carapace width 0.52–0.6; abdomen length 0.9–1.05; abdomen width 0.75–0.91; femur IV 0.41–0.5; patella I 0.17–0.2; IV 0.18–0.23; tibia I 0.22–0.33; IV 0.28–0.35. Live specimens have chestnut color in both sexes. In preserved specimens color is degraded from chestnut to fulvous or yellowish.