Bioacoustics of Crossopriza surobi

Description Male ( holotype ) MEASUREMENTS. Total length 4.2, carapace width 1.6. Distance PME–PME 100 µm; diameter PME 100 × 130 µm; distance PME–ALE 25 µm; diameter AME 90 µm; distance AME–AME 20 µm. Leg 1: 32.8 (9.2 + 0.6 + 8.9 + 11.9 + 2.2), tibia 2: 6.0, tibia 3: 4.3, tibia 4: 5.3; tibia 1 L/d: 64; femora 1–4 diameters: 0.22, 0.17, 0.17, 0.17. COLOR (in ethanol). Carapace ochre-yellow, anteriorly in median pit light brown; sternum with many small brown spots partly arranged in radial marks; legs ochre-yellow, without darker rings, with black lines on femora and (few) on tibiae; abdomen pale gray, with few indistinct small dark marks dorsally and posteriorly above spinnerets; ventrally with broken dark band, with indistinct parallel longitudinal marks behind gonopore. BODY. Habitus similar to C. tiwi sp. nov. (cf. Figs 393–394 ). Ocular area slightly raised. Deep thoracic pit and pair of furrows diverging from pit toward posterior margin. Clypeus unmodified, only rim slightly more sclerotized than in female. Sternum wider than long (1.05/0.65), unmodified. Abdomen slightly elongated, dorso-posteriorly angular to conical. Gonopore with four epiandrous spigots ( Fig. 852 ). CHELICERAE. As in Figs 814–815 , with two pairs of frontal apophyses; proximal pair in lateral position, pointed and directed towards lateral; distal pair directed towards median, at tip with one large modified cone-shaped hair each ( Fig. 845 ); distance between tips of modified hairs 30 µm; lateral stridulatory ridges distinct ( Fig. 841 ; distances between ridges ~4 µm), clearly visible in dissecting microscope. PALPS. As in Figs 806–808 ; coxa with rounded retrolateral hump; trochanter barely modified; femur distally strongly widened, with rounded ventral protrusion, proximally with prolateral stridulatory pick ( Fig. 842 ), without retrolateral transversal line, without retrolateral proximal process; femur-patella joints shifted toward prolateral side; tibia-tarsus joints slightly shifted toward retrolateral side; tarsus without macrotrichia; tarsal organ capsulate ( Fig. 849 ); procursus ( Figs 809–810 ) straight, prolateral proximal hump set with many hairs, long dorsal hairs not curved, procursus tip with flat dorsal sclerite (wide in dorsal view), strong ventral sclerite with distinctive retrolateral branch ( Fig. 846 ), and brush of short hair-like processes on retrolateral side ( Fig. 847 ); genital bulb ( Figs 811–813 ) with simple basal sclerite connected to distal (main) sclerite, sperm duct opening at basis of distal sclerite on prolateraldorsal side (arrow in Fig. 848 ); distal sclerite with retrolateral ridge and distinctive set of prolateral apophyses and ridge. LEGS. Femur 1 with single row of ~18 ventral spines; without curved hairs; few vertical hairs; retrolateral trichobothrium of tibia 1 at 4.5%; prolateral trichobothrium absent on tibia 1, present on other leg tibiae; tarsal pseudosegments not seen. Male (variation) Tibia 1 in seven males (incl. holotype ): 7.8–8.9 (mean 8.4). Some males also with whitish internal marks on abdomen. Female In general similar to male but without spines on legs, without stridulatory files on chelicerae ( Fig. 843 ), and with stridulatory organ consisting of pair of weakly sclerotized but distinct processes posteriorly on carapace and pair of small but distinct light brown plates anteriorly on abdomen. Tibia 1 in 12 females : 6.0–8.3 (mean 7.3). Epigynum as in Figs 819 and 853 ; main epigynal plate wider than long, weakly protruding, sclerotized area at posterior margin widening towards lateral; with median ridge with shallow pair of opposing pockets close together (distance 30 µm); internal sclerotized arcs and median anterior internal sclerite visible in uncleared specimens; posterior plate light brown, short but wide. Internal genitalia ( Figs 816–817 , 820–822 ) with large angular pore plates, dorsal arc simple, ventral arc stronger, with median sclerite asymmetric; apparently antisymmetric (only two females cleared; ‘left’ and ‘right’ sided).