Bioacoustics of Crossopriza pristina

Redescription Male (Massaua, MNHN Ar 10510) MEASUREMENTS. Total length 4.5, carapace width 1.6. Distance PME–PME 90 µm; diameter PME 120 × 140 µm; distance PME–ALE 35 µm; diameter AME 105 µm; distance AME–AME 40 µm. Leg 1: 49.1 (13.5 + 0.7 + 12.7 + 19.3 + 2.9), tibia 2: 8.5, tibia 3: 6.1, tibia 4: 6.9; tibia 1 L/d: 67; femora 1–4 diameters: 0.28, 0.23, 0.23, 0.23. COLOR (in ethanol). Bleached specimen mostly pale ochre-yellow; carapace pit anteriorly light brown; sternum posteriorly slightly darkened, with radial marks; legs ochre-yellow, without darker rings, black lines on femora and tibiae barely visible; abdomen ochre-gray, with few indistinct dark marks dorsally; ventrally with distinct black median band, partly disrupted, with three parallel longitudinal marks behind gonopore. BODY. Habitus very similar to C. sahtan sp. nov. (cf. Fig. 391 ). Ocular area slightly raised. Deep thoracic pit and pair of furrows diverging from pit toward posterior margin. Clypeus unmodified, only rim more sclerotized than in female. Sternum wider than long (1.15/0.75), unmodified. Abdomen slightly elongated, dorso-posteriorly angular. CHELICERAE. As in Figs 621–622 , proximally with low sclerotized humps near median line, distally with pair of frontal apophyses provided with one large modified cone-shaped hair each; distance between tips of modified hairs: 50 µm; lateral stridulatory ridges fine but visible in dissecting microscope. PALPS. As in Figs 608–610 ; coxa barely modified, with low retrolateral hump; trochanter barely modified; femur short, distally strongly widened, with rounded ventral protrusion, proximally with prolateral stridulatory pick, retrolateral-ventral rim with row of sclerotized hair-bases, with indistinct retrolateral transversal line, without retrolateral proximal process; femur-patella joints very close together, not shifted toward prolateral side; tibia very large relative to femur, tibia-tarsus joints slightly shifted toward retrolateral side; tarsus without macrotrichia; procursus ( Figs 616–617 ) short and straight, proximally on prolateral side with strong hump set with numerous long hairs, dorsal hairs not curved, procursus tip with short ventral sclerite and distinctive dorsal and retrolateral processes; genital bulb ( Figs 618–620 ) with simple basal sclerite connected to distal (main) sclerite, sperm duct opening on prolateral-dorsal side at basis of distal sclerite (arrow in Fig. 619 ); distal sclerite with distinctive ventral process and prolateral ridge. LEGS. Femur 1 with single row of ~30 ventral spines; without curved hairs; few vertical hairs; retrolateral trichobothrium of tibia 1 at 4%; prolateral trichobothrium absent on tibia 1, present on other leg tibiae; tarsal pseudosegments not seen. Male (variation) Tibia 1 in 11 males : 11.6–13.6 (mean 12.7). Specimens from Sudan (collected between 2013 and 2015) with distinct pattern of dark and whitish marks on abdomen (similar C. sahtan sp. nov. , cf. Fig. 391 ), with distinct black lines on femora and tibiae, and with dark brown sternum. All other specimens are much older (100 years and more) and probably artificially pale. Female In general similar to male but without spines on legs, apparently without stridulatory files on chelicerae, and with stridulatory organ consisting of pair of weakly sclerotized but distinct processes posteriorly on carapace and pair of indistinct light brown or non-darkened plates anteriorly on abdomen. Tibia 1 in 26 females : 10.0–13.6 (mean 11.9). Epigynum as in Figs 611–612 , main epigynal plate short but wide, weakly protruding; with pair of shallow pockets very close to median line on both sides of median ridge (distance between pockets 40 µm); internal sclerotized arc and median round structure visible in uncleared specimens; posterior plate indistinct, short but wide. Internal genitalia ( Figs 613–615 , 623– 624 ) with large oval pore plates in transversal position and close together, dorsal arc strongly sclerotized laterally, ventral arc with median pouch or pocket of unknown function.