Bioacoustics of Galapa murphyi

Description . Male ( holotype ) MEASUREMENTS.Total body length 1.12, carapace width 0.42. Distance PME-PME 40 µm; diameter PME 40 µm; distance PME-ALE 20 µm; distance AME-AME 10 µm; diameter AME 25 µm. Leg 1: 1.94 (0.52 + 0.14 + 0.50 + 0.46+ 0.32), tibia 2: 0.40, tibia 3: 0.34, tibia 4: 0.56; tibia 1 L/d: 9; diameters of leg femora 0.090, of leg tibiae: 0.055. COLOUR (in ethanol). Prosoma and legs ochre-yellow, carapace without pattern, legs without darker rings; abdomen ochre-grey with indistinct internal marks. BODY. Habitus as in Fig. 2A . Ocular area not raised ( Fig. 27A, B ). Carapace without thoracic groove ( Fig. 27A ). Clypeus slightly more protruding than in female (compare Fig. 27B and D ), with cluster of ~18 hairs directed towards dorsal ( Fig. 27C ) and sclerotized rim. Sternum slightly wider than long (0.32/0.30), with pair of small anterior processes near coxae 1 (20 µm long, 20 µm diameter at basis). Abdomen globular. Gonopore without epiandrous spigots ( Fig. 28E, F ; two males studied with SEM). ALS with one strongly widened spigot, one long pointed spigot, and five cylindrical spigots of which one is much wider than the others ( Fig. 28A ); PMS with two conical spigots ( Fig. 28A ); PLS without spigots. CHELICERAE. As in Fig. 3A ; with stridulatory files consisting of ~32 ridges, distances between ridges 1.5 µm throughout ( Fig. 27F ); fang with proximal rounded process ( Fig. 27E ). PALPS. As in Figs 25 , 29A–D ; coxa unmodified; trochanter without process; femur proximally with prolateral stridulatory pick, distally slightly widened but without modification; femur-patella joints slightly shifted towards prolateral side; tibia oval, with two trichobothria; tibia-tarsus joints slightly shifted towards retrolateral side; palpal tarsal organ strongly raised ( Fig. 29E ), diameter 5 µm, diameter of opening 1.2 µm; procursus with distinctive bifid retrolateral-distal process and with dorsal process curved towards prolateral and lodged in pocket of genital bulb; genital bulb with slightly spiraling distal apophysis ( Fig. 25 ) and small prolateral apophysis subdistally (arrow in Figs 25A , 29D ); sperm duct opening on prolateral-ventral side directly on bulb ( Fig. 29D ). LEGS. Without spines and curved hairs. With round cuticular plates ( Figs 30E , 31F ; diameter 4–5 µm) and rimmed pores ( Fig. 31F ; outer diameter 3 µm, diameter of opening 0.4 µm) apparently on all leg segments. Sexually dimorphic short vertical hairs present on tibia 1 ( Fig. 30A ), barely visible in dissecting microscope, length 17 µm, diameter at basis 1.2 µm. Chemoreceptive hairs similar in size (length 14 µm, diameter at basis 1.4 µm) but with side branch ( Fig. 30F, G ). Retrolateral trichobothrium of tibia 1 at 60%; prolateral trichobothrium absent on tibia 1. Tarsus 1 with five pseudosegments, poorly visible in dissecting microscope; leg tarsal organs capsulate ( Fig. 31A–D ), outer diameter 2–3 µm, diameter of opening 0.8–1.0 µm. Main tarsal claws with 9–11 tines ( Fig. 30F ); claws of tarsus 4 different from others (tines more directed towards distal; cf. Fig. 30H ). Variation (male) Tibia 1 in 20 other males from Guanacaste (except northern Guanacaste): 0.45–0.54 (mean 0.49). The male from northern Guanacaste ( 6 km S of La Cruz) differs slightly in the position and shape of the bifid retrolateral-distal process on the procursus ( Fig 26 —more proximal position on procursus; directed more towards lateral than towards proximal). In addition, the distal bulbal apophysis is slightly thinner, and the CO1 distances between a specimen from this locality and three other sequenced specimens were relatively high, at 9.4–10.1%. This male (and the accompanying specimens from this locality) are thus assigned tentatively to this species; tibia 1: 0.54. The three males from Colombia are in very bad condition (bleached) and thus difficult to compare; their palps are slightly smaller, but the bifid retrolateral-distal process on the procursus seems to be as in the holotype ; tibia 1: 0.48, 0.48, 0.54. Female In general, similar to male ( Fig. 2B–D ) but sternum without pair of anterior humps, chelicerae without stridulatory files ( Fig. 27G ), cheliceral fangs unmodified, clypeus less protruding ( Fig. 27D ) and without sclerotized rim, carapace with shorter hairs, and palpal tarsal organ less raised ( Fig. 29F ) and slightly smaller (diameter 4 µm, diameter of opening 1.2 µm). Tibia 1 in 19 females from Guanacaste (except northern Guanacaste): 0.39 – 0.48 (mean 0.44); in female from northern Guanacaste: 0.49; in females from Colombia : 0.42, 0.44. Epigynum ( Figs 28D , 32A– C ) with simple semicircular anterior plate, weakly protruding, posteriorly not indented medially; posterior plate short and simple, undivided medially. Internal genitalia ( Fig. 32D–I ) very simple, apparently without pore plates; with rectangular or bilobed membranous structure (without median process), covered by posterior epigynal plate. Natural history . The spiders were found under rocks and in dry leaf litter in exposed habitats, in open spaces of dry forests and on roadsides ( Fig. 5E, F ). No specimens were found in neighboring, more forested and humid sites. Two egg-sacs contained four and five eggs , respectively; egg diameters: 0.41–0.43. In glass vials, both males and females built small webs on which they were seen resting a few hours after being captured ( Fig. 2D ).