Bioacoustics of Agyneta fratrella

Description: Male : Total length 1.71; carapace length 0.82, width 0.66. CEPHALOTHORAX: Carapace dark orange-brown, shiny, finely reticulate; margin, radiating lines and pars cephalica lightly suffused with dark gray; trident mark present. Sternum orange-brown strongly suffused with dark gray. Clypeus height 2. Chelicerae dark orange-brown, excavated, ~ 16 seta-tipped tubercles; promargin one tooh, retromargin four tiny denticles on margin, two tiny denticles in between margins; both margins with large projections near base of fangs. Cheliceral stridulatory organ visible, ~ 38 striae, well spaced slowly getting closer basally. ABDOMEN: Uniformly medium gray. LEGS: Orange-brown, femur darker; leg I total length: 3.32; leg III total length: 2.34; Tm I: 0.27, Tm IV: absent. GENITALIA: Palpal retrolateral tibial apophysis well sclerotized, with small pointed tip; dorsal tibial apophysis with rounded tip, smooth, not strongly sclerotized; two retrolateral and one dorsal trichobothria ( Fig. 238 ). Cymbium triangular; glabrous depression present ( Fig. 238 ); dorsal cymbial tubercle anvil-shaped and smooth; ventral turbercle long, acute and smooth; prolateral notch deep ( Fig. 239 ). Paracymbium apically constricted, apical pocket long, anterior pocket short, deep and curved making a medium cover, posterior pocket absent ( Fig. 238 ). Embolus tip pointed with apical prong; ventro-retrolaterally with rows of spines; basally excavated with basal flange; Fickert’s gland elongated set basally; ventral lamella pointed, transparent; thumb elongated, reaching beyond the embolus proper, with well sclerotized tip ( Fig. 240 ). Embolus proper set basally ( Fig. 240 ). Anterior terminal apophysis long with long protrusions; posterior terminal apophysis small and twisted with large basal prong; lamella characteristica with bifid pointed tip ( Fig. 241 ). Female : Total length 1.94; carapace length 0.73, width 0.59. MAP. 16. Localities of Agyneta fratrella ( Chamberlin 1919 ) . CEPHALOTHORAX: Same coloration as in male. Chelicerae promargin four teeth, retromargin four denticles. Cheliceral stridulatory organ ~30 striae, closely spaced. ABDOMEN: Same as male. LEGS: Same as male; palpal tarsal claw absent, leg I total length: 2.86; leg III total length: 2.06; Tm I: 0.23, Tm IV: absent. GENITALIA: Epigynum with wide proximal part of scape, sides angular; epigynal slits long; pit hook depression average ( Fig. 242 ); lateral lobes long, stretcher small; pit deep ( Fig. 243 ). Median part of scape very narrow ( Fig. 244 ); genital pores situated in median part of scape ( Fig. 245 ). Internal genitalia with large, oval receptacula set horizontally ( Fig. 243 ).