Bioacoustics of Psalmopoeus cambridgei

Redescription. Female (MZUSP 76540). Total length, not including chelicerae or spinnerets 42.27. Carapace: 18.76 long, 16.66 wide, 10.15 high. Chelicera: 10.32 long. Legs (femur, patella, tibia, metatarsus, tarsus, total): I: 17.84, 10.18, 14.49, 15.37, 7.84, 65.72; II: 16.21, 9.43, 13.12, 13.43, 7.64, 59.87; III: 13.48, 7.7, 10.63, 12.35, 5.81, 49.97; IV: 16.15, 8.56, 13.96, 16.39, 5.9, 60.96. Palp: 11.64, 6.80, 8.26, -, 9.00, 35.7. Midwidths: femora I–IV = 3.73, 3.55, 3.40, 3.16, palp= 3.25; patellae I–IV= 3.66, 3.46, 3.37, 3.39, palp= 3.08; tibiae I–IV= 3.28, 3.03, 2.93, 2.84, palp= 2.77; metatarsi I–IV=2.85, 2.59, 1.94, 2.02; tarsi I–IV= 2.40, 2.42, 2.49, 2.27, palp=2.67. Abdomen: 22.05 long, 15.38 wide. Spinnerets: PMS, 2.48 long, 1.07 wide, 0.74 apart; PLS, 3.82 basal, 1.95 middle, 3.31 distal; width 1.87, 1.60, 0.97, respectively. Carapace: 1.13 times longer than wide; cephalic region slightly raised, thoracic striae moderately marked. Fovea: deep, straight, 3.13 wide. Eyes: eye tubercle 1.87 high, 2.98 long, 3.79 wide. Clypeus: absent. Anterior eye row straight, posterior slightly recurved. Eye size and interdistances: AME 0.74, ALE 0.84, PME 0.53, PLE 0.69, AME–AME 0.69, AME–ALE 0.31, AME–PME 0.27, ALE– ALE 2.72, ALE–PME 0.57, PME–PME 2.20, PME–PLE 0.10, PLE–PLE 2.85, ALE–PLE 0.34. Maxilla: length to width: 1.30. Cuspules: ca. 240 spread on anterior inner corner. Labium: 1.83 long, 1.83 wide, with ca. 172 cuspules ca. 1 diameter from each other. Chelicera: basal segment with 13 teeth in row. Short and ordered coverage setae densely grouped on retrolateral side of the chelicerae. Strikers: line of 5–6 spaced, long filiform setae disposed on ventral-basal portion of chelicera before the teeth row ( Fig. 157 ). Sternum: 10.03 long, 6.27 wide. Legs: Formula: I = IV, II, III. Length leg IV to leg I: 0.93. Scopula: Tarsi I–IV fully scopulate; IV with a line of few setae. Metatarsi I–II fully scopulate; III 2/3 distal; IV 1/3 distal. IV divided by rows of setae. Spination: Palp and legs (ventral apical: tibia/metatarsi) Palp: 0; I: 1/0; II 1/0; III 0/2; IV 0/2. Maxillary stridulatory organ: composed of 14–16 thick setae disposed on a straight crescent line, setae increase in size from the internal to external side of maxilla, longest setae flattened laterally, tips of setae with rugous texture, 7–8 slender setae after thickest ones ( Fig. 156 ). Short and ordered coverage setae densely grouped on the retrolateral side of the maxillae/coxae, trochanter and proximal part of femur of palp and prolateral side of the same articles of leg I. Spermathecae: Two elongate spermathecae completely separated, roughly straight, with 2–3 oval, protruding, sclerotized lobes disposed on a central fold on middle area of spermatheca, decreasing in size from apex. Apical lobe of spermathecae digitiform and well sclerotized ( Fig. 153 ). Coloration (preserved in alcohol): Carapace, abdomen and legs brown. Metatarsi with an orange line from retrolateral side through its center, an orange spot on tarsi. Females with one dark vertical central stripe on abdomen connected with 3–5 lighter gray transverse lines. Redescription. Male (MZUSP 76539) Total length, not including chelicerae or spinnerets 27.82. Carapace: 14.71 long, 13.33 wide, 7.22 high. Chelicera: 6.39 long. Legs (femur, patella, tibia, metatarsus, tarsus, total): I: 18.2, 8.95, 15.71, 15.66, 7.6, 66.12. II: 16.68, 8.1, 14.58, 14.8, 7.00, 61.16. III: 12.65, 5.86, 11.29, 12.4, 5.69, 47.89. IV: 16.41, 6.7, 15.11, 16.25, 6.28, 60.75. Palp 9.98, 5.50, 8.94, -,3.62, 22.54. Midwidths: femora I–IV= 3.05, 2.72, 2.74, 2.71, palp= 2.16; patellae I–IV= 2.72, 2.60, 2.48, 2.62, palp= 2.03; tibiae I–IV= 2.33, 2.04, 2.18, 2.15, palp= 2.17; metatarsi I–IV= 1.83, 1.60, 1.48, 1.35; tarsi I–IV= 1.53, 1.59, 1.45, 1.51, palp= 2.11. Abdomen: 13.48 long, 8.06 wide. Spinnerets: PMS, 1.26 long, 8.06 wide, 0.20 apart; PLS, 2.43 basal, 1.61 middle, 2.95 distal; midwidths 0.64, 0.86, 0.69, respectively. Carapace: 1.11 times longer than wide; cephalic region slightly raised, thoracic striae moderately marked. Fovea: deep, straight, 2.22 wide. Eyes: eye tubercle 1.00 high, 2.06 long, 3.29 wide. Clypeus: absent. Anterior eye row straight, posterior slightly recurved. Eye size and interdistances: AME 0.80, ALE 0.69, PME 0.39, PLE 0.65, AME–AME 0.35, AME–ALE 0.29, AME–PME 0.22, ALE– ALE 2.20, ALE–PME 0.31, PME–PME 1.88, PME–PLE 0.07, PLE–PLE 2.36, ALE–PLE 0.3. Maxilla: length to width: 1.58. Cuspules: ca. 161 spread on anterior inner corner. Labium: 1.83 long, 1.83 wide, with ca. 131 cuspules ca. 1 diameter from each other. Chelicera: basal segment with 12 teeth in row. Short and ordered coverage setae densely grouped on the retrolateral side of the chelicerae. Strikers: line of 4–5 spaced long filiform setae on ventral-basal portion of chelicerae, before the teeth row ( Fig. 155 ). Sternum: 7.68 long, 5.12 wide. Legs: Formula: I = II = IV, III. Length leg IV to leg I: 0.92. Scopula: Tarsi I–IV fully scopulate; IV with a few sparse setae. Metatarsi I–II fully scopulate; III 2/3 distal; IV 1/3 distal. IV divided by a row of setae. Spination: Palps and legs (ventral apical: tibia/metatarsi), palp = 0; I: behind retrolateral apophysis process = 1; II: 2/0; III: 2/0; IV: 2/1. Maxillary stridulatory organ: composed of 13–14 thick setae disposed on a straight crescent line, setae increase in size from the internal to external side of maxilla, longest setae flattened laterally, tips of setae with rugous texture, 7–8 slender setae after thickest ones ( Fig. 154 ). Short and ordered coverage setae densely grouped on the retrolateral side of the maxillae/coxae, trochanter, proximal part of palp femur and prolateral side of the same articles of leg I. Tibial apophysis ( Figs 150–152 ): two processes, retrolateral longer than prolateral, one spine at side of prolateral process, one at the apical part of retrolateral process. A small rounded protuberance behind retrolateral process. Metatarsus I folds on retrolateral side of tibial apophysis. Palp ( Figs146–149 ): tegulum length 1.46, width 1.96, embolus proximal width 0.85, embolus length 4.53. Embolus proximal portion straight. Embolus length to tegulum length 3.10. Embolus distal third curves to retroventral sides. Embolus tapers to its tip ending in a roughly straight tip. Color pattern (preserved in alcohol): carapace, abdomen light brown, legs and palpal femora light brown, metatarsi light brown with an orange line starting at side going through center. Dorsal tarsi with an orange spot.