Figs 95–97, Map 5
Type material. Holotype male from [48° 17’ 23” S 14° 05’ 42” W], Usina Hidroelétrica Serra da Mesa, Minaçu, Goiás, Brazil, 18–30.xi.1996, A. B. Bonaldo & L. Moura leg. (MCN 28054). Paratype: BRAZIL. Mato Grosso: Santa Isabel, [56° 08’ S 15° 36’ W], 1♁, 8.i.1961, B. Malkin leg. (AMNH).
Etymology. The specific name is a noun in apposition from the type locality name, Serra da Mesa.
Diagnosis. Males of A. mesa resemble those of A. ipioca (Fig. 88 A–C), A. itaqui (Fig. 91 A–C), A. rufipes (Fig. 72 A–C) and A. caxiuana (Fig. 100 A–C) by the BTA placed medially on prolateral tegular surface (Fig. 97 A); they resemble those of A. nattereri (Fig. 67 A–C), A. vilhena (Fig. 75 A–C), A. harveyi (Fig. 78 A–C) and A. caxiuana by the absence of an embolar serrated area. They resemble those of A. nattereri, A. rufipes, A. itaqui, A. utinga (Fig. 103 A–C) and A. caxiuana by the welldeveloped and bordered PA and differ from those of all other species of the group nattereri by PA placed in a triangular area and by the hirsute legs and body.
MALE (MCN 28054): Total length 10.87; Carapace, long 5.00; wide 5.00. Carapace anterior part tapering. Anterioreyerowslightlyprocurved,posteriorrowrecurved (Fig. 95 B). Without bristles between AME-clypeus. With one long bristle between ALE–ALP and many short and weak bristles between posterior eyes-fovea and lateral eyes-edge of carapace. Sternum with eight sigilla fused medially, two distal sigilla more fused than others (Fig. 95 C). Rastellum protuberant, inverted V-shaped, hirsute, without spines apically (Fig. 95 E, F). Chelicerae with six denticles along prolateral row of teeth. Prolateral row with six megateeth. Retrolateral row with seven megateeth (Fig. 95 D). Patella and tibia III with distal crown of welldeveloped thorns, on patella III interrupted in middle and on tibia III not interrupted in middle (Fig. 96 A, B). Patellae III and IV with spines on prolaterodorsal face (Fig. 96 A, C). Tibia IV without spines on dorsal surface (Fig. 96 D). Ventral pseudoscopulae occupying 40% of tarsus I, 60% of II and 100% of III and IV. Pseudoscopula of tarsi I and II with setae spaced, forming diffuse group of bristles; On tarsi III and IV, compact. Carapace, chelicerae, sternum, coxae, trochantera, femora, patellae, tibiae, metatarsi and tarsi reddish brown; Abdomen pale brown with small bluish spot on anterior dorsal surface (Fig. 95 A). Eyes: Diameters: PME 0.2, PLE 0.24, ALE 0.24, AME 0.28; MOQ: Length 0.84, front width 2.24, back width 2; Interdistances: PME–PME 1.36, PLE–PME 0.08, AME–AME 0.24, ALE–AME 0.6, ALE–PLE 0.44, AME–PME 0.36. Ocular area: OAL 3.62, OAW 2.75, and IF 1.75. Body: Clypeus: 0.25; Fovea: 2.12; Labium: long 1; wide 0.75; Chelicerae: long 2.87; wide 1.5; Sternum: long 3.25; wide 2.75. Abdomen: long 5.5; wide 4.25; 6.25. Leg measurements: I: Fe 5/ Pa 2/ Ti 3.12/ Me 3.87/ Ta 2.37/ total 16.37. II: 5/ 2/ 3.12/ 4/ 2.5/ 16.62. III: 4/ 2.12/ 2.12/ 4.25/ 2.75/ 15.25. IV: 3.87/ 2.25/ 3.75/ 4.75/ 2.62/ 17.25. Formula 4123. Spination: I—Fe v0, d0, p0, r0; Pa v0, d0, p0, r0; ti v0-1-7, d0, p0, r0; Me v3-3-2, d0, p0-0-1, r1-2-2; ta v1-1-2, d0, p0, r0-1-2. II—Fe v0, d0, p0, r0; Pa v0, d0, p0, r0; ti v0-0-3, d0, p0, r0; Me v4-5-7, d0, p0-0-1, r0-3-4; ta v1-6-1, d0, p0-3-2, r0-2-2. III—Fe v0, d0, p0, r0; Pa v0, d1-4-13, p0-0-2, r0- 0-2; ti v0-0-2, d1-0-8, p0-0-2, r0-0-3; Me v0-0-2, d1-2-1, p1-1-2, r0-0-3; ta v0, d0, p1-1-1, r0-0-1; IV—Fe v0, d0, p0, r0; Pa v0, d14-5-4, p1-2-1, r0; ti v0-0-1, d0, p0, r0; Me v1-1-3, d0, p0-0-6, r0-0-1; ta v0, d0, p0-4-1, r0. Palp: PA well-developed, continuous to PAc. Embolus with three keels (PAc, PI and PS). BTA developed, placed medially on prolateral tegular surface; serrated area absent; embolar bases thin, elongated. PA placed in triangular area (Fig. 97 A–C).
Distribution. BRAZIL. Goiás: Minaçu. Mato Grosso: Santa Isabel (Map 5).