Bioacoustics of Oaphantes cryophilus

Description.— Male (n=3) : Total length: 2.13–2.50; carapace length: 0.90–1.04; carapace width: 0.72–0.94; carapace, smooth, shiny, light yellow orange (130M), carapace slightly elevated in cephalic region, bearing 5–6 erect setae along midline. Sternum light yellow orange (130M). Chelicerae light yellow orange (130M), promargin with 2–3 teeth and bearing a large mastidion ( Fig. 10 ), retromargin carinated with 3–5 sharp denticles, presence of setae-tipped tubercles on cheliceral surface. Cheliceral stridulatory organ visible with ∼ 20 striae. Endite light yellow orange (130M) with a single large setose hook-shaped tubercle ( Fig. 9 ). Abdomen off-white (7500M), subcylindrical, pointed apically, covered with short semi-erected setae; ventral surface of abdomen bearing oval striated epigastric plates. Legs long and slender, light yellow orange (130M), formula 1-4-2-3; tibia I–IV with 2 short dorsal macrosetae; metatarsus I with dorsal trichobothrium, Tm I 0.52, Tm IV absent; coxae IV with stridulatory pick. Palpal femur with stridulatory pick. Male palp with a simple paracymbium (P) without obvious keel or proximal pocket, but bearing a proximal protuberance with three short setae, and 2 long setae on its apical part ( Fig. 11 ); embolus (E) straight, long, dentate and extending beyond the cymbium ( Figs 12, 13 ); embolic membrane (EM) long ( Figs 12, 13 ); lamella characteristica (LC) reduced and spine-like ( Figs 12, 13 ); terminal apophysis (TA) absent; 2 teeth on distal suprategular apophysis (SA) ( Figs 11, 13 ); reduced retrolateral tibial apophysis (RTA) ( Fig. 11 ). Female (n=5) : Total length: 2.23–2.31; carapace length: 0.86–0.90; carapace width: 0.71–0.80; carapace smooth, shiny, colouration as in male, carapace not elevated in cephalic region, bearing 4–5 erect setae along midline. Colouration of sternum and chelicerae as in male, promargin with 4 medium sized teeth, retromargin with 4–5 denticles, presence of setae-tipped tubercles on cheliceral surface. Cheliceral stridulatory organ visible with ∼ 16 striae. Endite colouration as in male, without a setose tubercle. Abdomen colouration as in male, sub-cylindrical, pointed apically, covered with short semi-erect setae; ventral surface of abdomen bearing oval striated epigastric plates. Legs long and slender, light yellow orange (FFD700), formula 1-4-2-3; tibia I–IV with 2 short dorsal macrosetae; metatarsus I with dorsal trichobothrium, Tm I 0.51, Tm IV absent; coxae IV with stridulatory pick. Palpal femur with stridulatory pick. Epigynum defined by the broad, anterior margin of the scape, slightly narrowing toward the apex, creating a short, broad scape (SC), ∼ 1\5 of the abdomen length ( Figs 14, 16 ); coiled spermathecae (S), secondary spermathecae (SS) elongate, curved and directed anteriorly ( Fig. 15 ); copulatory openings located on the underside of the scape near the apex and associated with terminal pockets (TP) ( Fig. 15 ); copulatory ducts long (CD) ( Fig. 15 ); fertilization ducts (FD) short and sinuous ( Fig. 15 ).