Bioacoustics of Agyneta jacksoni

Description: Male : Total length 1.98; carapace length 0.93, width 0.68. CEPHALOTHORAX: Carapace dark orange-brown, shiny, finely reticulate; suffused with gray along margin, radiating lines. Sternum brown suffused with gray. Clypeus height 2. Chelicerae orange, apical part lighter, excavated; ~12 seta-tipped tubercles; promargin five denticles, retromargin four denticles joined together, both margins with rounded projections near base of fang. Cheliceral stridulatory organ ~39 striae, well spaced throughout. ABDOMEN: Uniformly light to dark gray. LEGS: Light yellow; leg I total length: 2.94; leg III total length: 2.11; Tm I: 0.26, Tm IV: absent. GENITALIA: Palpal retrolateral tibial apophysis short and rugose; dorsal tibial apophysis wide and rugose; two retrolateral trichobothria and a dorsal one ( Fig. 116 ). Cymbium triangular; glabrous depression present ( Fig. 116 ); dorsal cymbial tubercle rounded, smooth; ventral tubercle absent; prolateral notch shallow ( Fig. 117 ). Paracymbium apical pocket short, anterior and posterior pockets short and curved ( Fig. 116 ). Embolus tip pointed, concave; ventro-basally spiny; basally with spur and small row of spines; Fickert’s gland absent; ventral lamella thin, serrated; thumb short reaching well below the embolus proper ( Fig. 118 ). Embolus proper set apically, dorsal part narrower ( Fig. 118 ). Anterior terminal apophysis wide with short protrusions; posterior terminal apophysis striated; lamella characteristica large, serrated, ending in two small points, with a large, rounded extension ( Fig. 119 ). Female : Total length 1.79; carapace length 0.79, width 0.54. CEPHALOTHORAX: Same coloration as male. Chelicerae yellow; promargin five teeth, retromargin five denticles. Cheliceral stridulatory organ visible ~26 striae, well spaced. ABDOMEN: Same as male. LEGS: Same as male; palpal tibia and tarsus brownish, tarsal claw absent; leg I total length: 2.53; leg III total length: 1.90; Tm I: 0.27, Tm IV: absent. GENITALIA: Epigynum with wide proximal part of scape, straight, vertical sides; epigynal slits oval and short; pit hook depression deep ( Fig. 120 ); lateral lobes wide and short, folded; stretcher and pit small ( Fig. 121 ). Median part of scape long; genital pores situated at base of lateral lobes pockets ( Fig. 122 ). Internal genitalia with a rounded ventral receptacula and a small, oval dorsal one ( Fig. 121 ).