Bioacoustics of Bolostromus

Description. Total length: male 2.03–14.01, female 4.57–16.06. CEPHALOTHORAX: Carapace longer than wide, rectangular to hexagonal; margin sinuous; smooth, rugose or reticulate; pars cephalica elevated ( Fig. 2C ), pars thoracica flat; cephalic groove shallow to deep, without pit ( Fig. 2C ) or with pit ( Fig. 25C , arrow); fovea strongly procurved to straight ( Figs 2A , 7A , 51A ). Sternum longer than wide ( Fig. 2B ), in some species considerably elongated ( Fig. 38B ) smooth or reticulate; sigillae present, posterior one round to oval, anterior and median one often inconspicuous ( Fig. 12B ). Labium without cuspule, as long as wide ( Fig. 10B ), or elongated ( Fig. 38B ). Endites with cuspules; serrula present ( Figs 30D, E ). Chelicerae with rastellum of 4–23 spines; chelicerae promarin with 6–7 teeth and groove with small denticles ( Figs 30B, C ); B. stridulator n. sp. with stridulatory organ ( Fig. 60D ). EYES: Eight eyes in two rows; PME the smallest; in some males eye region on a small mound ( Fig. 60C ); ocular quadrangle rectangular, sometimes slightly wider posteriorly ( Figs 51A , 57A ). LEGS: Tarsi I–II and metatarsi I–II with scopulae dense or thin ( Figs 2D , 5D ); femur IV with pro-apical spines; patella III with spines; males tibiae I with or without megaspine ( Figs 45D , 48D arrow); males metatarsi I sometimes with modified setae ( Figs 20A , 23D arrow); tarsal claw bipectinate, with 0–23 teeth; third claw present on all legs ( Fig. 31C, D ); leg formula 4123 or 1423. ABDOMEN: Oval to elongate; uniformly color or with pattern ( Figs 4A , 21A ).