Bioacoustics of Agyneta nigripes

Description: Male : Total length 1.89; carapace length 0.77, width 0.60. CEPHALOTHORAX: Carapace dark brown, shiny, finely reticulate; suffused with gray along margin, radiating lines; trident mark present. Sternum brown suffused with gray, darker along margin. Clypeus height 2. Chelicerae orange apical part lighter, not excavated; seta-tipped tubercles absent; promargin five teeth, retromargin five denticles, margins without projections near base of fang. Cheliceral stridulatory organ ~20 striae, well spaced throughout. ABDOMEN: Uniformly light to dark gray. LEGS: Light yellow; leg I total length: 2.36; leg III total length: 1.85; Tm I: 0.30, Tm IV: absent. GENITALIA: Palpal retrolateral tibial apophysis rounded, smooth; dorsal tibial apophysis triangular, rugose; two retrolateral trichobothria and a dorsal one ( Fig. 123 ). Cymbium triangular; glabrous depression present ( Fig. 123 ); dorsal cymbial tubercle pointed, smooth; ventral cymbial tubercle absent; prolateral notch shallow ( Fig. 124 ). Paracymbium apical pocket medium, anterior pocket curved and short, posterior pocket absent ( Fig. 123 ). Embolus tip wide, pointed and concave; basally with two small spines; Fickert’s gland absent; ventral lamella small, transparent; thumb short reaching well below the embolus proper ( Fig. 125 ). Embolus proper set apically, dorsal part narrower ( Fig. 125 ). Anterior terminal apophysis short, pointed with a few protrusions; posterior terminal apophysis narrow, striate; lamella characteristica large, margin serrated ( Fig. 126 ). Female : Total length 2.00; carapace length 0.74, width 0.61. MAP. 6. Localities of Agyneta nigripes (Simon 1884) , Agyneta dynica Saaristo & Koponen 1998, distribution based on material examined, distribution based on Paquin et al . 2010, Agyneta yukona n. sp., Agyneta mollis (O. Pickard-Cambridge 1871). CEPHALOTHORAX: Same coloration as male. Chelicerae yellow; promargin four teeth, retromargin four denticles. Cheliceral stridulatory organ visible ~23 striae, well spaced. ABDOMEN: Same as male. LEGS: Same as male; palpal tibia and tarsus brownish, tarsal claw absent; leg I total length: 2.18; leg III total length: 1.71; Tm I: 0.30, Tm IV: absent. GENITALIA: Epigynum with wide proximal part of scape, sides straight and slightly oblique; epigynal slits oval and short; pit hook depression deep ( Fig. 127 ); lateral lobes wide and very short; stretcher and pit small ( Fig. 128 ). Median part of scape long and wide, wider apically; genital pores situated at base of lateral lobes ( Fig. 129 ). Internal genitalia with a rounded ventral receptacula and a small triangular dorsal one ( Figs 128, 129 ).