Bioacoustics of Crossopriza semicaudata

Redescription Male ( Khartoum , MRAC 127505) MEASUREMENTS. Total length 3.4, carapace width 1.4. Distance PME–PME 80 µm; diameter PME 100 × 120 µm; distance PME–ALE 30 µm; diameter AME 95 µm; distance AME–AME 30 µm. Leg 1: 35.7 (10.3 + 0.6 + 9.4 + 13.3 + 2.1), tibia 2: 6.3, tibia 3: 4.7, tibia 4: 5.6; tibia 1 L/d: 59; femora 1–4 diameters: 0.20, 0.18, 0.17, 0.17. COLOR (in ethanol). Carapace ochre-yellow; carapace pit anteriorly light brown; sternum brown with darker radial marks; legs ochre-yellow, without darker rings, with black lines on femora and tibiae (cf. Figs 577–578 ); abdomen ochre-gray, with few indistinct dark marks dorsally; ventrally with black median band, partly disrupted. 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 (1.0/0.7), unmodified. Abdomen slightly elongated, dorso-posteriorly angular. Gonopore with four epiandrous spigots ( Fig. 606 ); ALS with one widened spigot and one pointed spigot; PMS with two pointed spigots ( Fig. 607 ). CHELICERAE. As in Figs 585–586 , distally with pair of frontal apophyses provided with one large modified cone-shaped hair each ( Fig. 598 ); distance between tips of modified hairs 90 µm; with ~12 enlarged hair-bases on each side ( Fig. 599 ); lateral stridulatory ridges distinct ( Fig. 599 ; distances between ridges ~4.5 µm), clearly visible in dissecting microscope. PALPS. As in Figs 574–576 ; coxa with low retrolateral hump; trochanter barely modified; femur distally strongly widened, with rounded ventral protrusion, proximally with prolateral stridulatory pick, with very indistinct retrolateral transversal line, without retrolateral proximal process; femur-patella joints close together, barely shifted toward prolateral side; tibia-tarsus joints shifted toward retrolateral side; tarsus without macrotrichia; tarsal organ capsulate ( Fig. 602 ); procursus ( Figs 579–581 ) short and straight, proximally on prolateral side with strong hump set with numerous long hairs, dorsal hairs mostly straight, some weakly curved, procursus tip with ventral sclerite with proximal ventral process, distinctive prolateral process, and semitransparent retrolateral-dorsal flap; with hair-like process on retrolateral side (arrow in Fig. 596 ); genital bulb ( Figs 582–584 ) with simple basal sclerite connected to distal (main) sclerite, sperm duct opening on prolateral side (arrow in Fig. 597 ); distal sclerite simple and flat, with semitransparent ventral process, without retrolateral ridge, without prolateral apophysis or ridge. LEGS. Femur 1 with single row of ~25 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 very indistinct, irregular except 1–2 at tip. Male (variation) Tibia 1 in 16 males (incl. lectotype ): 8.3–12.1 (mean 10.0); lectotype smaller (carapace width 1.25), with shortest tibia (8.3) and fewer spines on femur 1 (~18). More recently collected specimens with distinct pattern of dark and whitish marks dorsally on abdomen (similar C. sahtan sp. nov. , cf. Fig. 391 ); ventral pattern behind gonopore variably distinct, with 2–4 longitudinal bands often not clearly separate. Female In general similar to male but without spines on legs, without stridulatory files on chelicerae ( Fig. 600 ), and with stridulatory organ consisting of pair of weakly sclerotized but distinct processes posteriorly on carapace (arrows in Fig. 595 ) and pair of small light brown plates anteriorly on abdomen. Tibia 1 in 46 females : 7.0–10.2 (mean 8.8). Epigynum as in Figs 589–590 ; main epigynal plate semicircular, medially protruding; with pair of large pockets close to median line (distance between pockets 40 µm); internal sclerotized arc variably visible in uncleared specimens; posterior plate relatively large but mostly weakly sclerotized except frontally laterally. Internal genitalia ( Figs 587–588 , 591–593 ) with oval pore plates, dorsal arc weakly sclerotized laterally, ventral arc medially barely modified.