Bioacoustics of Artema ghubrat

Description. Male ( holotype ). MEASUREMENTS. Total length 8.1, carapace width 3.1. Distance PME-PME 190 µm; diameter PME 160 µm; distance PME-ALE 30 µm; distance AME-AME 40 µm, diameter AME 140 µm. Leg 1: 61.4 (15.7 + 1.3 + 17.2 + 24.3 + 2.9), tibia 2: 13.5, tibia 3: 9.7, tibia 4: 12.1; tibia 1 L/d: 57. COLOR (in ethanol). Carapace pale ochre-yellow, slightly darker pit and light brown ocular area; clypeus with indistinct light brown median band and dark brown rim; sternum ochre-yellow with light brown margins; legs ochre-yellow, patellae slightly darker, femora 1 proximally red-brown. Abdomen monochromous pale gray. BODY. Habitus as in Fig. 3 . Ocular area barely elevated, on posterior part with ~20 very strong hairs. Deep thoracic pit behind ocular area, without thoracic furrow in posterior part of carapace. Clypeus unmodified except for slightly thickened brown rim. Sternum wider than long (2.1/1.4), unmodified. Gonopore with four epiandrous spigots. CHELICERAE. As in Figs 21–22 , with several sclerotized cone-shaped hairs in distinctive arrangement, with median ridges leading to distal apophyses and pair of rounded lateral projections; with very fine and barely visible stridulatory ridges. PALPS. In general very similar to known congeners ( Fig. 29 ); coxa unmodified, trochanter ventrally slightly projecting and strongly sclerotized, femur strongly widened, with retrolateral apophysis proximally pointing towards ventral, with stridulatory pick (modified hair) prolaterally near joint to trochanter, patella very short, ventrally closed, i.e. not reduced; tibia retrolateral trichobothrium in very proximal position; procursus with distinct dorsal apophysis and ventral pocket in very proximal position, distally widened, without light notch in dorsal view ( Fig. 9 ); genital bulb with short membranous embolus accompanied by two processes (processes a and b in Aharon et al. 2017 ), with distinct and large process c and small process d ( Figs 10 , 15–16 ). LEGS. Without spines and curved hairs, few vertical hairs; regular mechanoreceptive sensilla either thick and variably long (~0.15–1.5) or thin and short (~0.08–0.15); retrolateral trichobothrium of tibia 1 at 9%; prolateral trichobothrium present on all tibiae; tarsus 1 with ~15–20 pseudosegments, barely visible. Male (variation). Tibia 1 in 8 other males: 14.1–16.8 (mean 15.7). Female . In general similar to male ( Fig. 4 ) but with distinct stridulatory ridges on chelicerae, clypeus rim not brown, and femora 1 proximally not red-brown. Tibia 1 in 8 females : 10.4–14.0 (mean 12.4). Entire epigynal area ( Fig. 31 ) strongly protruding, anterior plate on frontal side of epigynal protuberance and posterior plate on rear side; anterior plate rectangular, dark brown laterally, lighter and slightly bulging medially; posterior plate simple, very wide. Anterior epigynal projections barely visible. Internal genitalia simple, with pair of elongated pore plates in transversal position ( Figs 26 , 35–36 ).