Bioacoustics of Arnapa tinoor

Description. Male ( holotype ). MEASUREMENTS. Total length 2.2, carapace width 1.05. Distance PME-PME 90 µm; diameter PME 100 µm; distance PME-ALE 80 µm; distance AME-AME 20 µm, diameter AME 45 µm. Leg 1: 27.9 (6.6 + 0.4 + 6.9 + 11.9 + 2.1), tibia 2: 3.9, tibia 3: 2.8, tibia 4: 3.9; tibia 1 L/d: 73. 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 slightly darker marks near 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 slightly darker mark in gonopore area, 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. 43 . Ocular area elevated, thoracic furrow present; clypeus with median rounded process ~100 µm long ( Fig. 68 ), possibly provided with glands ( Fig. 98 ). Sternum wider than long (0.68/0.40), unmodified. ALS with only two spigots each, one widened, one pointed ( Fig. 97 ). Gonopore without epiandrous spigots ( Fig. 101 ). CHELICERAE. As in Fig. 68 , with several sclerotized cones in distinctive arrangement: large cones in a lateral row ( Fig. 99 ) and smaller cones in a frontal patch ( Fig. 100 ); without modified hairs; with stridulatory ridges ( Fig. 99 ). PALPS. As in Figs 65–66 ; coxa unmodified, trochanter with short ventral process weakly sclerotized, femur strongly widened, with large rounded retrolateral process proximally, with stridulatory pick (modified hair) proximally and stronger than usual hairs distally on ventral-retrolateral side, patella ventrally reduced (not closed), tibia retrolateral trichobothrium in very proximal position, tarsus small, tarsal organ exposed ( Fig. 102 ), procursus with dorsal process proximally, ventrally slightly concave but without pocket, distally with distinctive sclerotized and membranous elements ( Fig. 67 ), with brush of hair-like structures on prolateral side ( Fig. 104 ); genital bulb large, with complex process carrying sperm duct opening ( Figs 69 , 103 ). LEGS. Without spines; few vertical hairs; with curved hairs on femora, tibiae, and metatarsi of all legs (especially legs 1–2); retrolateral trichobothrium of tibia 1 at 9%; prolateral trichobothrium present on all tibiae; tarsus 1 with ~25 pseudosegments, distally distinct. Male (variation). Number of sclerotized cones on chelicerae slightly variable but pattern consistent. Tibia 1 in 28 males : 4.9–7.6 (mean 6.6). Female . In general similar to male but clypeus unmodified; chelicerae without stridulatory ridges (confirmed by SEM). Tibia 1 in 37 females : 3.8–5.1 (mean 4.5). Epigynum as in Figs 87 and 95 , anterior plate divided medially by variably distinct whitish area, with additional smaller plate in front of anterior epigynal plate; posterior plate very short but wide. Internal genitalia with distinctive lateral folds and narrow anterior ‘valve’, relatively small pore plates ( Figs 74 , 89 ). ALS as in male ( Fig. 96 ).