Bioacoustics of Amazonius giovaninii

Description. Female holotype (MNRJ 7715). Total length, not including chelicerae or spinnerets 35.44. Carapace 13.89 long, 11.78 wide, 7.97 high. Chelicera: 7.68 long. Legs (femur, patella, tibia, metatarsus, tarsus, total): I: 11.88, 7.13, 9.58, 8.81, 5.08, 42.48; II: 11.13, 5.77, 8.46, 8.29, 5.52, 39.17; III: 9.37, 5.25, 7.26, 8.04, 4.75, 34.67; IV: 11.66, 5.86, 10.67, 10.97, 5.10, 44.26; Palp: 7.96, 4.65, 5.38, -, 6.39, 24.38. Midwidths: femora I–IV= 2.30, 2.50, 2.59, 2.23, palp= 1.83; patellae I–IV= 2.58, 2.44, 2.36, 2.34, palp= 2.13; tibiae I–IV= 2.42, 2.15, 2.08, 2.12, palp= 1.93; metatarsi I–IV= 2.06, 1.77, 1.65, 1.47; tarsi I–IV= 1.96, 1.85, 1.66, 1.56, palp= 1.81. Abdomen: 20.88 long, 13.07 wide. Spinnerets: PMS, 0.97 long, 0.40 wide, 0.67 apart; PLS, 1.2 basal, 0.93 middle, 1.23 distal; midwidths 0.74, 0.77, 0.49, respectively. Carapace: 1.18 times longer than wide; cephalic region slightly raised, thoracic striae conspicuous. Fovea: deep, straight, 1.63 wide. Eyes: eye tubercle 0.62 high, 1.85 long, 3.26 wide. Clypeus absent. Anterior eye row straight, posterior slightly recurved. Eye size and interdistances: AME 0.72, ALE 0.78, PME 0.50, PLE 0.67, AME–AME 0.46, AME–ALE 0.30, AME–PME 0.22, ALE–ALE 2.16, ALE–PME 0.42, PME–PME 1.76, PME–PLE 1.18, PLE–PLE 2.52, ALE–PLE 0.27. Maxilla: length to width 1.63. Cuspules: ca. 197 spread over ventral inner heel. Labium: 1.05 long, 2.38 wide, with ca. 150 cuspules spaced by one diameter from each other on anterior third. Chelicera: basal segment with 9 teeth in row. Strikers: Long and short filiform setae, disposed without discernible pattern on a ventral-basal portion of chelicera before the teeth row ( Fig. 375 ). Sternum: 6.92 long, 5.90 wide. Legs: Formula: I = IV II III. Length leg IV to I: 1.04. Scopula: Tarsi I–IV fully scopulate; IV with a few sparse setae. Metatarsi I–II fully scopulate; III 1/2 distal; IV 1/4 distal. IV divided by rows of setae. Femora I ventrally and laterally with short scale like setae ( Figs 357–359 ). Spination: Palps and legs (ventral apical: tibia/metatarsi): Palp 0; I: 0/0; II 2/0; III 0/2; IV 0/2. Maxillary stridulatory organ: weakly developed, composed of slightly thick setae with rugose aspect, not disposed on an ordered line, grouped forming an oval patch on the prolateral face of the maxillae ( Fig. 374 ). Spermathecae ( Fig. 371 ): Two spermathecae completely separated, slightly curved apically with a subdivided apical lobe. Color pattern (preserved in alcohol): Carapace brown, leg and palpal femora brown, abdomen with a central line connected with 2–3 transverse lateral stripes. Description. Male (INPA 9105). Total length, not including chelicerae or spinnerets 29.44. Carapace 11.33 long, 11.13 wide, 2.99 high. Chelicera: 6.00 long. Legs (femur, patella, tibia, metatarsus, tarsus, total): I: 14.80, 7.30, 12.87, 11.93, 6.42, 53.32; II: 13.08, 5.96, 11.09, 10.66, 5.52, 46.31; III: 10.82, 4.77, 8.65, 10.03, 4.57, 38.84; IV: 13.55, 5.60, 11.92, 13.46, 4.92, 49.45; Palp: 8.58, 4.33, 7.60, -, 2.38, 22.89. Midwidths: femora I–IV= 2.31, 2.21, 2.15, 2.09, palp= 1.74; patellae I–IV= 2.03, 2.11, 1.92, 1.93, palp= 1.65; tibiae I–IV= 1.59, 1.48, 1.52, 1.68, palp= 1.53; metatarsi I–IV= 1.24, 1.13, 1.06, 1.01; tarsi I–IV= 1.06, 1.15, 1.14, 1.10, palp= 1.80. Abdomen: 16.16 long, 9.65 wide. Spinnerets: PMS, 1.50 long, 0.65 wide, 0.37 apart; PLS, 2.32 basal, 1.94 middle, 2.78 distal; midwidths 0.91, 0.94, 0.83, respectively. Carapace: 1.02 times longer than wide; cephalic region slightly raised, thoracic striae conspicuous. Fovea: deep, straight, 1.09 wide. Eyes: eye tubercle 0.38 high, 2.00 long, 2.84 wide. Clypeus: absent. Anterior eye row straight, posterior slightly recurved. Eye size and interdistances: AME 0.80, ALE 0.69, PME 0.46, PLE 0.61, AME–AME 0.44, AME–ALE 0.14, AME–PME 0.13, ALE–ALE 1.94, ALE–PME 0.17, PME–PME 1.59, PME–PLE 0.12, PLE–PLE 2.07, ALE–PLE 0.50. Maxilla: length to width 1.52. Cuspules: ca. 155 spread over ventral inner heel. Labium: 1.49 long, 2.02 wide, with ca. 117 cuspules spaced by one diameter from each other on anterior third. Chelicera: basal segment with 9 teeth in row. Strikers: Long and short filiform setae, disposed without discernible pattern on a ventral-basal portion of chelicera before and beginning of teeth row ( Fig. 373 ). Sternum: 6.18 long, 4.81 wide. Legs: Formula: I = IV II III. Length leg IV to leg I: 0.93. Scopula: Tarsi I–IV fully scopulate. Metatarsi I–II fully scopulate; III 2/3 distal; IV 1/2 distal. IV divided by rows of setae. Spination: Palps and legs (ventral apical: tibia/metatarsi): Palp 0; I: 1 behind retrolateral process of tibial apophysis; II: 3/0; III 2/2; IV 1/2. Maxillary stridulatory organ: weakly developed, composed of slightly thick setae with rugose aspect, not disposed on an ordered line, grouped like a spot on prolateral face of the maxillae ( Fig. 372 ). Tibial apophysis ( Figs 368–370 ): two processes, retrolateral longer than prolateral, one spine at side of prolateral, one at the apical part of retrolateral process and another on its median area. A rounded protuberance behind retrolateral process. Metatarsus I sinuous, folds on retrolateral side of tibial apophysis. Palp (figs 364–367): tegulum length 1.04, width 1.2, embolus proximal width 0.64, length 4.11 Embolus proximal portion straight. Embolus length to tegulum lengh: 3.95. Embolus roughly straight with a slight curvature distally, narrowing abruptly on its distal portion. Embolus tip roughly straight. Color pattern (preserved in alcohol): Carapace, chelicerae, legs, labium, sternum and maxillae light brown, abdomen lighter.