Bioacoustics of Galapa gabito

Description . Male ( holotype ) MEASUREMENTS. Total body length 0.96, carapace width 0.38. Distance PME-PME 35 µm; diameter PME 30 µm; distance PME-ALE 15 µm; distance AME-AME 10 µm; diameter AME 20 µm. Leg 1: 1.68 (0.46 + 0.12 + 0.44 + 0.38+ 0.28), tibia 2: 0.34, tibia 3: 0.30, tibia 4: 0.48; tibia 1 L/d: 9; diameters of leg femora 0.075, of leg tibiae: 0.050. COLOUR (in ethanol). Prosoma and legs pale ochre-yellow, carapace without pattern, legs without darker rings; abdomen ochre-grey with indistinct internal marks. BODY. Habitus as in Fig. 2E . Ocular area not raised. Carapace without thoracic groove. Clypeus slightly more protruding than in female, with sclerotized rim. Sternum slightly wider than long (0.26/0.23), with pair of small anterior processes near coxae 1 ( Fig. 13D ; 20 µm long, 20 µm diameter at basis). Abdomen globular. Gonopore with four epiandrous spigots ( Fig. 13E ). Spinnerets apparently as in female (see below; dirty in scanned male). CHELICERAE. In general, very similar to congeners (cf. Fig. 3 ), with curved process proximally on fang ( Fig. 13C ); with stridulatory files consisting of ~30 ridges, distances between ridges proximally 2.0 µm, distally 1.1 µm ( Fig. 13A ), proximal ridges with further fine subdivision. PALPS. As in Figs 12 , 14A–D ; coxa unmodified; trochanter without process; femur proximally with prolateral stridulatory pick, distally slightly widened but without modification; femur-patella joints slightly shifted towards prolateral side; tibia oval, with two trichobothria; tibia-tarsus joints slightly shifted towards retrolateral side; palpal tarsal organ strongly raised ( Fig. 14E ), diameter 5.5 µm, diameter of opening 1.3 µm; procursus with pointed retrolateral-distal process distinctively directed towards dorsal and with dorsal process curved towards prolateral and lodged in pocket of genital bulb ( Fig. 14B ); genital bulb with small distal apophysis and similar prolateral distal apophysis; sperm duct opening apparently on prolateral-ventral side directly on bulb. LEGS. Without spines and curved hairs. With round cuticular plates ( Fig. 15D ; diameter 4–5 µm) and rimmed pores ( Fig. 15E ; outer diameter 3 µm, diameter of opening 0.3 µm) apparently on all leg segments. Sexually dimorphic short vertical hairs present on tibiae 1 and 2 ( Fig. 15A, B ), barely visible in dissecting microscope, length ~15 µm, diameter at basis 1.0 µm. Chemoreceptive hairs similar in size (length ~10 µm, diameter at basis 1.3 µm) but with side branch (cf. Fig. 15F ). Retrolateral trichobothrium of tibia 1 at 57%; prolateral trichobothrium absent on tibia 1. Tarsus 1 with five pseudosegments, fairly distinct; leg tarsal organs capsulate. Main tarsal claws with ~9–11 tines. Variation (male) Tibia 1 in eight males (including holotype ): 0.41–0.44 (mean 0.43). Female In general, similar to male ( Fig. 2F ) but sternum without pair of anterior humps, chelicerae without stridulatory files ( Fig. 13B ), cheliceral fangs unmodified, clypeus less protruding and without sclerotized rim, and palpal tarsal organ less raised ( Fig. 14F ) and slightly smaller (diameter 4.3 µm, diameter of opening 1.0 µm). Tibia 1 in 15 females : 0.37 – 0.40 (mean 0.39). ALS with one strongly widened spigot, one long pointed spigot, and apparently five cylindrical spigots, of which one is much wider than the others ( Fig. 13F ); PMS with two conical spigots; PLS without spigots. Epigynum ( Fig. 16A, B ) with simple semicircular anterior plate, weakly protruding, posteriorly not indented medially; posterior plate short and simple, with indistinct median division. Internal genitalia ( Fig 16C–F ) with distinctive sclerite in ventral wall of uterus externus (arrow in Fig. 16D ); apparently without pore plates; with bilobed membranous structure (without median process), covered by posterior epigynal plate. Natural history . Most specimens were beaten out of dead cacti lying on the ground in a dry forest covering hills near the sea ( Fig. 5C ). They shared this microhabitat with another species of Ninetinae , an undescribed representative of Ibotyporanga .