Bioacoustics of Selenogyrus foordi

Description of paratype female ( BE _ RMCA _ ARA. Ara. 222490). Total length including chelicerae: 52.3. Carapace: length 20.0, width 18.0. Caput: raised. Ocular tubercle: slightly raised, length 3.3, width 1.5. Eyes: ALE > AME , AME > PLE , PLE > PME , anterior row procurved, posterior row recurved. Clypeus: narrow; clypeal fringe: short. Fovea: deep, procurved. Chelicera: length 12.3, width 8.3. Abdomen: length 24.0, width 15.5. Maxilla with 160–180 cuspules, covering approximately 40 % of proximal edge. Labium: length 2.7, width 3.4, with 130–160 labial cuspules most separated by 0.5–1.0 × the width of a single cuspule. Labio-sternal mounds: separate, raised. Sternum: length 8.7, width 7.8, with three pairs of sigilla. Tarsi I – IV fully scopulate. Metatarsal scopulae: I 83 %; II 65 %; III 49 %; IV 23 %. Lengths of leg and palpal segments: see Table 2 , legs 4, 1, 2, 3. Spination: femur palp d 0–0 – 1, tibia I v 0–0 – 3, II v 0–0 – 3, III v 2–1 – 2, p 0–1 – 0, r 0–1 – 0, IV v 1–1 – 3, p 0–1 – 0, r 0–1 – 1, palp p 0–2 – 2, r 0–0 – 2, metatarsus I r 0–0 – 3, II r 0–0 – 3, III d 0–0 – 2, v 2–2 – 4 (3 apical), p 1–1 – 2, r 1–1 – 0, IV v 3–4 – 5 (3 apical), r 1–1 – 0. Posterior lateral spinnerets with three segments: basal 2.2, medial 2.0, digitiform apical 3.3. Posterior median spinnerets with one segment. Spermathecae with two distinct and separate receptacles, basally wider than apex, medially with prolateral and retrolateral flaring, tapering gently thereafter to apex, each receptacle with a single indistinct lobe without neck constriction (Fig. 2 D ). Stridulation organ: prolateral face of chelicera furnished with clavate stridulatory lyra (Fig. 2 C ). Colour in alcohol: brown (Figs 2 A – B ). - I II III IV Palp Femur 16.4 14.4 12.5 16.8 5.8 Patella 9.4 6.5 7.1 8.1 3.0 Tibia 12.5 10.2 8.2 12.1 3.8 Metatarsus 11.2 10.1 11.1 17.1 – Tarsus 7.3 7.1 5.7 7.7 4.0 Total 56.8 48.3 44.6 61.8 16.6

Description of holotype male ( BE _ RMCA _ Ara. 246088). Total length including chelicerae: 26.7. Carapace: (damaged) length 12.0, width 10.5. Caput: slightly raised. Ocular tubercle: (damaged during capture, not measurable). Eyes (interpreted in life): AME > ALE , ALE > PLE , PLE > PME , anterior eye row procurved, posterior row slightly recurved. Clypeus: narrow; clypeal fringe: long. Fovea: deep, procurved. Chelicera: length 4.3, width 1.8. Abdomen: length 10.4, width 6.4. Maxilla with 100–150 cuspules covering approximately 32 % of the proximal edge. Labium: length 1.2, width 1.5, with 200–220 cuspules most separated by 0.5–1.0 × the width of a single cuspule. Labio-sternal mounds: separate, raised. Sternum: length 4.9, width 3.6, with three pairs of sigilla. Tarsi I – II and IV fully scopulate, tarsus III missing (but confirmed undivided in paratypes examined). Metatarsal scopulae: I 85 %; II 78 %; III 43 %; IV 17 %. Lengths of legs and palpal segments: see Table 1 , legs 4, 1, 2, 3. Spination: femur I d 0–0 – 1, II d 0–0 – 1, palp d 0–0 – 1, patella III p 0–0 – 1, tibia II d 0–2 – 1, v 2–1 – 3, III d 2–2 – 2, v 3–1 – 3, IV d 1–1 – 2, v 2–1 – 3, palp p 0–1 – 2, metatarsus I v 0–0 – 1 (apical), II v 2–0 – 3 (apical), III d 2–2 – 3, v 3–2 – 3 (apical), IV d 4–6 – 3, v 4–6 – 6 (3 apical). Tibia I with paired tibial apophysis, RB longer than PB , PB with 2 prolateral megaspines situated medially, almost as long as branch; RB with one prolatero-apical megaspine, much shorter than branch (Figs 4 A – F , 5 A – F ). Femur III: slightly incrassate. Palpal tibia: unmodified. Palpal cymbium: unmodified. Metatarsus I: straight, unmodified. Posterior lateral spinnerets with three segments, basal 1.1, median 0.5, digitiform apical (missing). Posterior median spinnerets with one segment. Palpal bulb with TH weakly developed; embolus filiform, tapering strongly in apical third; PS , RS , and A weakly developed, PS and RS apically fused (Figs 2 A – I , 3 A – D ). Stridulation organ: prolateral face of chelicera furnished with clavate stridulatory lyra. Colour in alcohol: brown (Figs 1 A – B ). - I II III IV Palp Femur 12.6 11.4 10.0 13.6 7.2 Patella 6.0 5.7 4.6 5.3 3.5 Tibia 10.4 9.5 7.2 11.0 6.9 Metatarsus 11.1 10.1 11.6 16.5 – Tarsus 7.4 5.5 * 7.0 2.3 Total 47.5 42.2 ≥ 33.4 53.4 19.9