Bioacoustics of Nanometa trivittata

DESCRIPTION: Female (TEAU003) total length 5.6. Cephalothorax length 2.1, width 1.6. Clypeus height 0.84 AME diameter. Cephalothorax background yellow, dark brown on the cephalic area and carapace edges (fig. 9A, C). Eyes subequal in size, lateral smaller. Sternum brown (fig. 9E). Cheliceral promargin and retromargin with three and two teeth respectively, ca. five cheliceral denticles. Abdomen dorsum background dark gray, most guanine patches forming a medial line divided into four to six lateral lobes delineated by dark-brown chevrons, lateral areas of the abdomen dorsum with intercalated areas of guanine patches and dark-brown spots (fig. 9A). Lateral line of guanine patches complete (fig. 9C). Ultrastructure of abdomen, tracheae, and spinnerets (figs. 11D, 12A) observed with SEM. Abdomen cuticle flat reticulated; median tracheal trunks branched, lateral tracheae tube shaped (fig. 11D). ALS with one major ampullate, one nubbin, ca. 60 piriform, tartipores present (fig. 12B). PMS with one nubbin, one minor ampullate, one cylindrical, and three central aciniform spigots (fig. 12C). PLS araneoid triplet spigots tips clustered together, ca. 12 aciniform spigots distributed in two parallel rows, two cylindrical gland spigots at the periphery (fig.12D). Femur I length 3.36. Copulatory ducts modified as membranous sacs with smooth cuticle (figs. 9H, 11C, 13E), spermathecae and “copulatory sacs” sclerotization variable (fig. 9F, H) accessory duct glands clustered on the internal surfaces (fig. 11C). Description based on specimens (TEAU003, TEAU006, TEAU008, TEAU023, TEAU035). Male (TEAU036): Same as female except as noted. Total length 4.23. Cephalothorax length 2.0, width 1.5. Clypeus 0.95 AME diameter (fig. 9I). Cephalothorax and abdomen coloration lighter than in female, sternum coloration yellow. Cheliceral denticles ca. six. Booklung covers and coxa IV surfaces examined with SEM. Stridulatory organ formed by a thin cuticular ridge on booklung anterior edge, opposite to several cuticular ridges on coxa IV retrolateral surface. Femur I length 4.73. Basal apophysis of conductor tip slen- der and as long as the distal apophysis, distal apophysis thicker, heavily sclerotized and ending in a curved tip (figs. 11E, F, 13A–C). Description based on specimens (TEAU004, TEAU036). VARIATION: Females ( N = 7) total length 5.3– 7.2, cephalothorax length 2.1–2.8, width 1.6–2.2. The depth of the median septum pit varies from almost flat to considerably deep. Males ( N = 6) total length 3.4–6.5, cephalothorax length 2.0– 3.2, width 1.3–2.4. CEBP apophysis tip varies in shape from a rounded spatula to a broken tip. Conductor tip apophyses vary in length and orientation angle.