Bioacoustics of Arnapa tolire

Description. Male ( holotype ). MEASUREMENTS. Total length 2.1, carapace width 0.95. Distance PME-PME 75 µm; diameter PME 85 µm; distance PME-ALE 60 µm; distance AME-AME 15 µm, diameter AME 40 µm. Leg 1: 24.6 (5.9 + 0.4 + 6.1 + 10.2 + 2.0), tibia 2: 3.4, tibia 3: 2.4, tibia 4: 3.3; tibia 1 L/d: 81. COLOR (in ethanol). Carapace ochre-yellow with dark brown bands laterally and wide band medially including ocular area; clypeus with pair of dark bands below eye triads; sternum ochre-yellow with pair of light brown bands on both sides of median line; legs brown, with indistinct darker rings on femora (subdistally) and tibiae (proximally and subdistally), tips of femora and tibiae whitish. Abdomen gray, dorsally densely covered with dark marks, ventrally with large brown mark in front of gonopore, dark median band behind gonopore, pair of brown external marks and pair of larger internal ventro-lateral marks in front of spinnerets. BODY. Habitus as in Fig. 41 . Ocular area elevated, thoracic furrow present; clypeus unmodified. Sternum wider than long (0.58/0.36), unmodified. CHELICERAE. As in Fig. 63 , each side with 3–4 large sclerotized cones along lateral margin and 3–4 smaller cones frontally proximally; without modified hairs; with stridulatory ridges. PALPS. As in Figs 60–61 ; coxa unmodified, trochanter ventrally only slightly protruding, femur widened, with rounded retrolateral process proximally, with prolateral stridulatory pick (modified hair) proximally and stronger than usual hairs distally on ventral-retrolateral side, patella ventrally reduced (not closed), tibia longer than in known relatives, retrolateral trichobothrium in very proximal position, tarsus small, procursus with dorsal process proximally, ventrally without pocket, distally with distinctive sclerotized and membranous elements ( Fig. 62 ); genital bulb large, with complex process ( Fig. 64 ). LEGS. Without spines, few vertical hairs; with curved hairs on tibiae and metatarsi 1–2 (few on legs 2); retrolateral trichobothrium of tibia 1 at 11%; prolateral trichobothrium present on all tibiae; tarsus 1 with ~30 pseudosegments, distally distinct. Male (variation). Size and number of sclerotized cones on chelicerae slightly variable but pattern consistent. Tibia 1 in 5 other males: 5.2–6.1 (mean 5.7). Female . In general similar to male ( Fig. 42 ), also with curved hairs on legs. Chelicerae without stridulatory ridges ( Fig. 92 ). Tibia 1 in 9 females : 3.8–4.6 (mean 4.1). Palpal tarsal organ exposed ( Fig. 93 ). Epigynum anterior plate square-shaped ( Figs 84 , 94 ), with two areas of deep transversal ridges anteriorly laterally, medially whitish, posterior rim with pair of rounded projections; with separate brown plate in front of epigynum; posterior plate very short but wide. Internal genitalia with distinctive lateral folds, narrow anterior ‘valve’, and elongated pore plates ( Figs 73 , 86 ). ALS with only two spigots each (confirmed by SEM).