Bioacoustics of Olgania

Description . Very small, entelegyne Araneoidea : total length 0.90 to 1.20. Cephalothorax : Carapace with glandular depressions above maxillae; cuticle of carapace and sternum heavily punctate, covered with glandular pits (Fig. 188); margins fused to sternum via pleural sclerites. Six (Fig. 177C) or no (Fig. 182C) eyes present on anterior margin of pars cephalica; AME absent. Chelicerae with or (rarely) without bulging anterior projections in males; promargin with two true teeth (Fig. 190B); fused setal sockets, peg teeth and ectal stridulatory ridges absent. Legs and female pedipalp : Legs three-clawed (Fig. 191D), covered with smooth or serrate hair-like setae. Trichobothria present on legs; tibiae each with three (legs I–III) or four (legs III–IV) trichobothria; metatarsi (legs I–III) each with single trichobothrium (Fig. 191C). Female pedipalp entire, five-segmented; claw absent (Fig. 190C–D). Abdomen : Abdomen subtriangular in lateral view, with very large, wedge-shaped anterior sclerite present around epigastric region and petiole, extending anteriorly and laterally to cover entire anterior portion of abdomen (Figs 176D, 177A); dorsal scute absent on males and females (Fig. 176A–B); posterior abdomen thickened around dorsal and lateral margins of anterior sclerite, with ring of sclerotic sigillae (Fig. 177B) and sclerotic ring surrounding spinnerets and colulus. Six spinnerets situated posterior to fleshy colulus; ALS largest; PMS smallest; spigot morphology unknown. Anterior tracheal system well-developed, with multiple anteriorly-directed tracheae (Fig. 178A); posterior tracheal spiracle vestigial (Figs 189C–D). Genitalia : Male pedipalp (Fig. 192) small to large; patella with retrolaterally-directed, hooked ligulate retrolateral apophysis and strongly recurved distal apophysis; tibia with or without pair of large prolateral macrosetae; tegulum smooth, with curved, marginal evaginated tegular ridge; embolus exposed, long (length> 5× width), sometimes coiled. Female genitalia (Fig. 178) with pair of separate, globular anterior receptacula each with internal ducts; insemination ducts looped or coiled; fertilisation ducts simple, curved.