Bioacoustics of Diguetia balandra

Remarks. Live specimens of D. balandra sp. nov. have bodies covered with white setae, which usually fall off after capture (see Fig. 25 ). Diguetia stridulans was described on the basis of a single female from Mejía Island, Baja California (currently deposited at CAS collection). According to Chamberlin (1924: 590–591) and Gertsch (958: 24) this is a distinctive species that readily separated it from other species as mentioned above (diagnosis). Furthermore, the ratio of the first leg to the carapace of D. stridulans is longer than in the other species, and the stridulating file on chelicerae is composed of fine and coarse striae ( Chamberlin 1924 , Gertsch 1958 ). The holotype is in poor condition ( Gertsch 1958: 24 ) and needs further study, but the characters above allow us to distinguish it from D. balandra sp. nov. .

Description. Male ( holotype CARCIB-Ar 0032). Coloration : carapace and chelicerae dark yellow with scarce setae, fovea inconspicuous but with a depressed area from where two bands of white setae emerge towards the ocular area, carapace margins, and clypeus with white setae, eyes with black rings ( Figs 1 , 25 ). Endites pale yellow with scarce white setae and margins darker. Labium and sternum brown, the latter with margins dark and white setae ( Fig. 3 ). Legs I–IV light yellow, Fm I lighter proximally, Ti I, and Mt I darker than Fm I. Pt II and Ti II slightly darker, Ti II with a dark distal ring and Mt with darker sides. Pt III darker, Ti III, Mt III and Ta III with a dark distal ring. All segments of leg IV with dark distal ring ( Fig. 28 ). Dorsum and sides of opisthosoma greyish, covered with white and dark setae, dorsum with a longitudinal dark band, broadened posteriorly with a wavy margin and bordered more densely with white setae ( Fig. 2 ). Venter of opisthosoma dark brown, epigastric area darker, and spinnerets black ( Fig. 4 ). Habitus : carapace oval, cephalic region slightly narrower than thoracic region ( Fig. 1 ). Front face of chelicerae is very rugged, the stridulatory file occupies almost all lateral face. Promargin of chelicerae with a transparent lamina and two distal teeth; retromargin with three small teeth. Labium, endites and sternum longer than wide ( Fig. 3 ). Trochanters of all legs without notch; Ta and Mt without scopula; paired pectinate claws with ten teeth. Metatarsal lyriform organ with eight slits in dorsal view ( Fig. 21 ). Ta I with false sutures. Opisthosoma without caudal extension. Palp : Fm with three ventrolateral stridulating pins (arrow in Figs 11, 13 ), Ta with two finger-like processes, the prolateral one shorter ( Figs 11 , 17 ), the suboval bulb narrows apically (0.7 long, 0.3 wide; Figs 13–16 ), with spoon-shaped embolus (0.3 long) and straight tubular prong, half the length of the embolus (0.16 long) ( Figs 11–17 ). Measurements: total length 4.8; carapace 2.25 long, 1.37 wide; clypeus height 0.16; chelicerae length 0.56. Eye sizes and interdistances: AME 0.13, ALE 0.13, PME 0.13; AME–ALE 0.09, AME–PME 0.16. Length of legs segments: I 9.9 (3.0, 0.7, 2.9, 2.1, 1.2), II 8.8 (2.8, 0.6, 2.4, 2.3, 0.7), III 6.8 (2.2, 0.5, 1.6, 1.8, 0.7) IV 10.1 (3.2, 0.5, 2.6, 3.0, 0.8). Leg formula 4123. Female (CARCIB-Ar 0004). Coloration : as the male but carapace and chelicerae light brown, the later with dark lateral sides ( Figs 5–8 ). Sternum, endites and labium darker than in male ( Fig. 7 ). Palps light yellow and black macrosetae. Legs I–IV light yellow, Pt I–IV darker than other segments; Ta I–IV and Mt I–IV darker distally. Fm IV and Ti IV with dark distal ring, Pt IV dark brown lateral sides, Mt IV dark-yellow with very long macrosetae ( Figs 24, 29 ). Dorsum and venter of opisthosoma as in male, although epigastric area with long black setae and hyaline setae ( Figs 6, 8–9 ). Front face of chelicerae is very rugged, the stridulatory file occupies almost all lateral face ( Fig. 20 ). Ta with dorsal slit sensilla ( Fig. 22 ) and dorsal capsulate tarsal organ ( Fig. 23 ). External genitalia : anterior sclerotization semicircular on anterior dark brown trapezoid pigmentation; posterior sclerotization represented by narrow strip ( Figs 8–9 ). Internal genitalia : two oval lateral pore plates heavily sclerotized, a wide uterus externus, a membranous median sac, which is slightly longer than wide, lies dorsally to the uterus ( Figs 10 , 18–19 ). Measurements: total length 6.4, carapace 2.3 long, 1.4 wide; clypeus height 0.26, chelicerae length 0.56. Eye sizes and interdistances: AME 0.13, PME 0.13, ALE 0.13, AME–ALE 0.9, AME–PME 0.19. Length of legs segments: I 7.8 (2.4, 0.8, 2.1, 1.7, 0.8), II 7.0 (2.1, 0.7, 1.9, 1.6, 0.7), III 5.6 (1.9, 0.6, 1.2, 1.4, 0.5), IV 9.0 (2.9, 0.7, 2.4, 2.5, 0.5). Variation. Males (n=2) total length 3.9–4.1; carapace 2.0 long, 1.3–1.4 wide; clypeus height 0.2; chelicerae length 0.5–0.6. Length of legs segments: I 10.0–10.4 (3.0–3.1, 0.7–0.8, 3.0, 2.2–2.4, 1.1), II 8.5–9.3 (2.6–2.7, 0.6, 2.5, 2.3–2.4, 0.9-1.0), III 6.5–7.2 (2.1–2.2, 0.5, 1.5–1.8, 1.7–2.0, 0.6–0.7), IV 9.6–10.2 (3.0–3.2, 0.5–0.6, 2.6, 2.9–3.0, 0.6–0.8). Eye sizes and interdistances: AME 0.09, PME 0.13, ALE 0.13, AME–ALE 0.06–0.09, AME– PME 0.06–0.13 Females (n=11) total length 4.4–6.9, carapace 1.8–3.3 long, 0.8–1.8 wide; clypeus height 0.2– 0.3, chelicerae length 0.6–0.8. Length of legs segments: I 6.6–8.2 (2.3–1.9, 0.5–0.8, 1.7–2.3, 1.4–1.7, 0.7–1.5); II 6.1–8.3 (1.7–2.1, 0.6, 1.8, 1.5, 1.9, 1.6–1.7, 0.7–0.8), III 4.1–5.6 (1.3–1.8, 0.5–0.6, 0.7–1.2, 1.0–1.3, 0.6–0.7), IV 6.8–9.5 (2.1–2.7, 0.5–0.7, 1.8–2.4, 1.8–3.0, 0.6–0.7).AME 0.13–0.16, PME 0.09–0.13, ALE 0.13–0.19. AME–ALE 0.09–0.19, AME–PME 0.13–0.16.