Bioacoustics of Ibotyporanga emekori

Redescription Male (ZFMK Ar 24374) MEASUREMENTS . Total body length 1.7, carapace width 0.72. Distance PME–PME 55 µm; diameter PME 55 µm; distance PME–ALE 20 µm; distance AME–AME 15 µm; diameter AME 40 µm. Leg 1: 4.03 (1.10+0.30 +1.00 +1.20 + 0.43), tibia 2: 0.87, tibia 3: 0.63, tibia 4: 1.23; tibia 1 L/d: 11; diameters of leg femora 0.18, of leg tibiae 0.09–0.10. COLOUR (in ethanol). Prosoma and legs mostly ochre-yellow, carapace posteriorly medially slightly darker, femora and tibiae with indistinct darker subdistal rings on femora and tibiae; abdomen pale gray with many darker internal marks dorsally and laterally; ventrally with indistinct light ochre plates in front of gonopore and in front of spinnerets. BODY . Habitus as in Fig. 73D . Ocular area slightly raised. Carapace with distinct but shallow thoracic groove. Clypeus with sclerotized rim with median notch. Sternum slightly wider than long (0.48/0.45), with pair of very low and indistinct humps near coxae 1 not different from those of female. Abdomen globular. CHELICERAE . As in Fig. 99A–B ; width 0.29; with short median frontal apophysis; stridulatory files very fine and poorly visible in dissecting microscope. PALPS . As in Fig. 97 ; coxa unmodified; trochanter with short ventral protrusion; femur proximally with distinct retrolateral process directed toward distal, with prolateral stridulatory pick, distally widened but unmodified; femur-patella joints not shifted toward one side; patella dorsally ~1.9 × as long as medially wide; tibia with two trichobothria in very proximal position; tibia-tarsus joints slightly shifted toward retrolateral side; tarsus without dorsal process; procursus ( Fig. 98A–C ) long and slender, with long dorsal branch proximally very close to main branch, distally in dorsal view S-shaped; main branch with light prolateral band, with tiny subdistal side branch (130 µm from tip), distal tip membranous, strongly curved towards dorsal and prolateral; genital bulb ( Fig. 98D–F ) with narrow but distinct prolateral sclerite on bulbous part, embolus very simple, with indistinct processes. LEGS . Without spines but with longer hairs ventrally on femora; without curved hairs; with several rows of short vertical hairs on tibiae 1 and 2; retrolateral trichobothrium of tibia 1 at 59%; prolateral trichobothrium absent on tibia 1; tarsus 1 with ~4–5 pseudosegments, distally fairly distinct. Variation (male) Tibia 1 in nine newly examined males: 0.90–1.02 (mean 0.96); in holotype : 0.84; in six other males examined previously ( Huber & Brescovit 2003 ): 0.88–0.96. Dark rings on legs sometimes barely visible or absent. The species delimitation analysis ( Fig. S7 ) suggested a possible split between the sequenced specimens from near Toca do Índio and those from Fazenda Pedra Branca. The K2P distance between them was 14.1%. However, no morphological differences were found between males from these two localities. Female In general, similar to male but with slightly darker legs, ocular area, and clypeus; clypeus unmodified; leg tibiae with few short vertical hairs; tibia 1 length in 17 newly examined females: 0.88–1.17 (mean 1.00); in three other females examined previously ( Huber & Brescovit 2003 ): 0.88–0.96. Epigynum ( Fig. 100A–C ) anterior plate trapezoidal to oval, posterior margin almost straight, with weakly curved and shallow pocket near anterior margin; posterior plate wide but short. Internal genitalia ( Figs 99C , 100D–E ) with median sclerotized structure, distinct pair of pore plates, and large expandable anterior sac. The females from São Desiderio are assigned tentatively because no males are available from this locality. One female was cleared, and the internal genitalia (not figured) appear essentially identical to those of two cleared females from Serra do Calcário. In a cleared female from Fazenda Pedra Branca, the median internal genital sclerite appears slightly longer than in females from Serra do Calcário.