Bioacoustics of Pholcophora tehuacan

Description Male ( holotype ) MEASUREMENTS . Total body length 1.20, carapace width 0.55. Distance PME-PME 40 µm; diameter PME 45 µm; distance PME-ALE 20 µm; distance AME-AME 15 µm; diameter AME 20 µm. Leg 1: 2.55 (0.75 + 0.20 + 0.65 + 0.60 + 0.35), tibia 2: 0.55, tibia 3: 0.50, tibia 4: 0.75; tibia 1 L/d: 8; diameters of leg femora 0.11–0.12, of leg tibiae 0.08. COLOUR (in ethanol). Prosoma and legs monochromous pale ochre-yellow; abdomen slightly darker, also monochromous. BODY . Habitus as in Fig. 3J . Ocular area barely raised. Carapace with low thoracic groove. Clypeus unmodified, very short (clypeus rim to ALE 0.12). Sternum slightly wider than long (0.34/0.32), almost round (i.e., not heart-shaped), with pair of small but distinct anterior processes (~30 µm long) near coxae 1. Abdomen globular; gonopore with four epiandrous spigots ( Fig. 29C ); ALS with seven spigots, PMS with two spigots ( Fig. 29G ). CHELICERAE ( Fig. 26A–B ). With pair of frontal apophyses directed downwards; stridulatory ridges very fine ( Fig. 29A ; distances between ridges 2.0–2.2 µm), not visible in dissecting microscope. PALPS ( Fig. 25 ). Coxa unmodified; trochanter without process; femur proximally with retrolateral-ventral process and prolateral stridulatory pick, distally widened but simple, slightly curved towards dorsal; femur-patella joints slightly shifted toward prolateral side; tibia very short, with two trichobothria; tibia-tarsus joints not shifted to one side; tarsal organ raised, with small opening ( Fig. 29E ); procursus very simple ( Fig. 26C–E ), with subdistal constriction and semi-transparent tip; genital bulb complex ( Fig. 26F–H ), with distinctive retrolateral-dorsal apophysis and long distal process. LEGS . Without spines and curved hairs; with usual low number of short vertical hairs; retrolateral trichobothrium of tibia 1 at 60%; prolateral trichobothrium absent on tibia 1; tarsus 1 with 6 pseudosegments, all fairly distinct. Variation (male) Tibia 1 in ten males (incl. holotype ): 0.60–0.65 (mean 0.62). Female In general, similar to male ( Fig. 3K ) but sternum without pair of anterior humps, and chelicerae without stridulatory files ( Fig. 29B ). Total body length ~1.20–1.40; tibia 1 in 14 females 0.60–0.65 (mean 0.62). Epigynum ( Fig. 27 ) with short and simple anterior plate slightly protruding in lateral view; posterior plate wide, median part not separated from lateral parts by pair of whitish anterior areas. Internal genitalia ( Fig. 28 ) with pair of distinct sacs (receptacles?) 60 µm long, without (or with very small?) pore plates.