Bioacoustics of Aenigmarachne colombiana

Description. Male holotype (ICN-Ar 13744). Total length including chelicerae 15.9; carapace length 6.4, width 5.4; caput slightly raised ( Fig. 1A ); ocular tubercle raised, length 0.8, width 1.3. Eyes: ALE> PLE, PLE> AME, AME> PME, anterior row slightly procurved, posterior row recurved ( Fig. 1C ); clypeus narrow; fovea deep, transverse, straight; chelicera length 3.5, width 1.7; opisthosoma length 6.0, width 4.0 ( Fig. 1B ); maxilla with ca . 176 cuspules, covering ca . 36% of proximal edge ( Fig. 1D ); labium length 1.1, width 1.3, with 34 labial cuspules ( Fig. 1D ); labio-sternal mounds joined along entire base of labium; sternum length 3.1, width 2.8, with three pairs of sigilla ( Fig. 1D ); tarsi I densely scopulate, tarsi II–IV divided by band of stout setae; metatarsal scopula: I 100%; II 50%; III 41%; IV ascopulate; lengths of leg and palpal segments see Table 1 . Leg formula 4,1,2,3; spination: tibia I d 0–1–0, v 0–1–4 (3 apical) II d 1–0–1, v 0–1–1 (apical) III d 1–2–1, v 1–2–3 (apical) IV d 1–0–2, v 2–2–4 (3 apical), palp p 0–0–3, metatarsus I v 1–0–2 (apical), II v 1–0–3 (apical), III d 1–2–3 (1 apical), v 1–4–7 (5 apical), IV d 2–1–2, v 6–4–8 (4 apical); palpal tibia slightly incrassate with a low retrolateral nodule ( Fig. 5A–C ); leg I without tibial apophyses; metatarsus I straight, basal or median nodule absent; femur III slightly incrassate, femur IV without a pad of plumose setae on retrolateral face, stridulation organ absent in all legs; posterior lateral spinnerets with three segments ( Fig. 1E ): basal 1.4, medial 0.9, digitiform apical 1.3; posterior median spinnerets with one segment; palpal bulb with an elongate and thin embolus, tapering to its tip, with slight curvature at its basal third, small extent of separation between base of bulb and tegulum, PS and PI keels weakly developed, A keel present ( Figs 2–4 ). Urticating setae: only subtype I b present. Colour alive: body completely dark brown, with yellowish setae surrounding the carapace (As in Fig. 8B ). I II III IV Palp Femur 7.2 6.5 5.9 6.1 4.2 Patella 3.6 3.2 3.0 3.0 2.4 Tibia 6.1 4.8 4.3 6.2 3.6 Metatarsus 4.4 4.7 5.2 8.0 – Tarsus 2.8 2.9 2.9 3.4 1.5 Total 24.1 22.1 21.3 26.7 11.7 Description. Female paratype (ICN-Ar 13749). Total length including chelicerae: 32.4; carapace length 12.0, width 10.6; caput highly raised ( Fig. 6A ); ocular tubercle raised, length 1.4, width 1.9. Eyes: ALE> PLE, PLE> AME, AME> PME, anterior row procurved, posterior row recurved ( Fig. 6C ); clypeus wide; clypeal fringe long; fovea deep, transverse, procurved; chelicera length 4.7, width 3.7; opisthosoma length 15.7, width 10.1 ( Fig. 6B ); maxilla with ca .179 cuspules, covering ca . 30% of proximal edge ( Fig. 6D ); labium length 1.6, width 2.1, with 43 labial cuspules ( Fig. 6D ); labio-sternal mounds joined along entire base of labium; sternum length 5.5, width 5.2, with three pairs of sigilla ( Fig. 6D ); tarsi I–IV divided by band of stout setae which is wider on the posterior tarsi; metatarsal scopula: I 100%; II 50%; III 25%; IV ascopulate; lengths of leg and palpal segments see Table 2 . Leg formula 4,1,2,3; spination: femur I d 0–0–1, II d 0–0–1, III d 0–0–1, IV d 0–0–1, patella III p 0–0–2, r 0–1–0, IV p 0–0–1, r 0–1–0, tibia II d 0–0–1, v 0–1–2 (apical) III p 1–1–1, r 1–1–1, v 1–2–3 (apical), IV p 1–1–0, r 1–2–1, v 3–2–4 (3 apical), palp v 0–0–4 (3 apical), metatarsus I v 0–0–2 (apical), II p 0–1–1, v 1–0–3 (apical), III d 0–0–2, p 1–2–0, v 0–1–2, v 2–3–5 (4 apical), IV p 1–1–1, r 1–2–1, v 9–6–9 (5 apical); femur III not incrassate, femur IV without pad of plumose setae on retrolateral face, stridulation organ absent from all legs; posterior lateral spinnerets with three segments: basal 2.2, medial 1.5, digitiform apical 1.8; posterior median spinnerets with one segment. Urticating setae: only subtype I e present. Spermathecae: consisting of two separate seminal receptacles with a wide base, narrow neck and extended apical lobes. Each seminal receptacle emerges from ovate guard plate ( Fig. 7 ). Colour alive: prosoma and opisthosoma reddish brown with a dark grey pad of urticating setae ( Fig. 8A ).