Bioacoustics of Atmetochilus atriceps

Description: Female (ARA-2018-173, CUMZ), similar to lectotype except as noted. Habitus ( Fig. 8A ). Body length 17.56. Color in nature: Carapace, chelicerae, legs and abdomen black, abdomen covered by pale white spots and ventral of abdomen and spinnerets with pale white overall. Color in alcohol: Carapace dark brown; chelicerae nearly black. All legs and abdomen brown. Carapace ( Fig. 8B ): 4.80 long, 6.40 wide. Chelicerae 3.00 long. Eye ( Fig. 8C ): tubercle with 2 rows on low mound, 4 eyes on each row. Anterior row procurved, posterior row slightly recurved. Eye sizes and interdistances: AME 0.27, AME-AME 0.09, ALE 0.39, ALE-ALE 0.90, PME 0.27, PME-PME 0.60, PLE 0.24, PLE-PLE 0.90, AME-ALE 0.12, AME-PME 0.09, AME-PLE 0.30, ALE-PME 0.15, ALE-PLE 0.09, PME-PLE 0.03. Fovea ( Fig 8B ): strongly procurved to U-shaped. 3 rows of setae in fovea. “Rastellum” of around 30 robust down-curved setae. Cheliceral furrow with 6 ( 8 in lectotype ) promarginal teeth and mesobasal denticles. Fang ventrally smooth without teeth. Stridulating strikers absent. Labium ( Fig. 8D ): 1.25 long, 0.85 wide, without cuspules. Maxillae ( Fig. 8D ): 2.32 long, 1.43 wide with 20 tiny cuspules each on proximal anterior lobe. Sternum ( Fig. 1D ): 3.60 long, 3.00 wide. posterior and medial sternal sigilla centrally confluent, anterior sigilla separate in upper margin. Spines and scopula: palp: tibia, p7; tarsus scopulate, v1. I: tibia, v2; metatarsus scopula cover entire, v4, Tarsus scopulate on venter, without spines. II: tarsus scopula cover entire on ventral without spines, metatarsus without scopula, v1 p5, Tibia and other segments without spines. III: patella, p3; tibia, p3; metatarsus with 19 spines, v5 r1 p9 d4; tarsus without spines and scopulate. IV: metatarsus with 15 spines, v2 r4 p9. Preening combs on both faces of distal ventral metatarsi III–IV. Legs ( Table 5 ), formula: 4132. Femur Patella Tibia Metatarsus Tarsus Total Palp 3.30 1.86 2.28 - 2.34 9.78 Leg I 5.10 3.00 3.54 3.00 1.80 16.44 Leg II 3.72 2.28 3.00 2.70 1.80 13.50 Leg III 4.80 2.88 2.70 3.30 2.16 15.84 Leg IV 5.40 2.94 3.30 4.50 2.04 18.18 Scopula: entire on tarsus of palp, relatively short, sparse cover on distal half on metatarsus I, absent on tarsi II–IV, tibiae and femora I–IV. Trichobothria: one zigzag row of 8–12 on tarsi I–IV, one row of 6–16 on metatarsi I–IV and 5 in each of two rows on tibiae I, III. Claws: 1 row of teeth on prolateral face of palpal claw; 2 rows of teeth on both faces of pair claws of I–IV but differing in number, including 3 teeth on inner side, 5 teeth on outer side of I, 2 teeth on inner side, 5 teeth on outer side of II–III and two teeth on inner side, 3–4 teeth on outer side of IV. Spermathecae ( Fig. 11B ): head of spermathecae spherical, stalk 0.51 mm , base 1.00, stalk base and tip of equal width. Spinnerets: PMS 1.25 long, diameter 0.30. PLS: 3.10 long, 0.50 diameter. length of basal, medial and apical segments 1.25, 0.75, 1.10. apical segment digitiform.