Actinopus buritiensis sp. nov. Figs 27–29, Map 3 Type material. Holotype male from [55º 50’ S 15º 23’ W], Buriti, Chapada dos Guimar „es, Mato Grosso, Brazil, xii.1992, L. F. Silva leg. (MCTP 2940). Etymology. The specific name is a noun in apposition from the type locality name. Diagnosis. The male of A. buritiensis, as in A. obidos (Fig. 26 A–C), presents the BTA positioned medially on the tegular prolateral surface, and PA inconspicuous in prolateral view. It resembles those of other species with only two embolar keels (PS and PI) by the small serrated area along the embolus, with few cusps; tegulum thin and proximal third of the embolus narrow and long. It differs from males of A. obidos by the thinner and elongated tegulum and by the well-developed BTA (Fig. 29 A–C). MALE (MCTP 2940): Note. The holotype lacks both legs II. Total length 9; Carapace, long 5.37; wide 5.25. Carapace anterior part tapering. Eyes. Anterior row slightly procurved, posterior row recurved (Fig. 27 B). With many short bristles between AME-clypeus, one bristle between ALE–ALP and many short and weak bristles between posterior eyes-fovea and lateral eyesedge of carapace. Sternum with eight sigilla fused medially, two distal sigilla more fused than others (Fig. 27 C). Rastellum protuberant, inverted V-shaped, hirsute, with row of strong spines apically (Fig. 27 E–F). Chelicerae with 14 denticles along prolateral row of teeth. Prolateral row with five megateeth. Retrolateral row with six megateeth and two denticles, one between three distal and four distal and other between two basal megateeth (Fig. 27 D). Patella and tibia III with distal crown of welldeveloped thorns, not interrupted in middle (Fig. 28 A–B). Patellae III and IV with spines on prolaterodorsal face (Fig. 28 A, C). Tibia IV without spines on dorsal surface (Fig. 28 D). Ventral pseudoscopulae occupying 40% of tarsi I and 100% of III and IV. Pseudoscopula of tarsi I 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; tibia of palp paler than other articles; Abdomen gray (Fig. 27 A). Eyes: Diameters: PME 0.24, PLE 0.24, ALE 0.32, AME 0.44; MOQ: Length 0.84, front width 2.56, back width 2.44; Interdistances: PME–PME 1.52, PLE–PME 0.12, AME–AME 0.12, ALE–AME 0.6, ALE–PLE 0.32, AME–PME 0.44. Ocular area: OAL 3.87, OAW 3, and IF 2.25. Body: Clypeus: 0.12; Fovea: 2.25; Labium: long 1.25; wide 1; Chelicerae: long 2.25; wide 1.62; Sternum: long 3.5; wide 3.12. Abdomen: long 4.12; wide 2.75. Leg measurements: I: Fe 4.62/ Pa 2.37/ Ti 3.5/ Me 4/ Ta 2.25/ total 16.75. III: 4/ 2.37/ 2.5/ 3.87/ 2.75/ 15.5. IV: 5.62/ 2.37/ 4.75/ 4.62/ 3.12/ 20.5. Formula 4123. Spination: I—Fe v0, d0, p0, r0; Pa v0, d0, p0, r0; ti v1-1-8, d0, p0-0-2, r0; Me v7-7-2, d0, p3-3-3, r1-1-1; ta v4-3-3, d0, p2-2-2, r0-1-2. III—Fe v0, d0, p0, r0; Pa v0, d7-9-25, p1-0-20, r0-0-2; ti v0, d0, p0-1-2, r0-1-3; Me v1- 2-4, d0, p1-0-2, r0-2-4; ta v0, d0, p0-2-4, r0-4-4. IV—Fe v0, d0, p0, r0; Pa v0, d12-8-9, p0, r0; ti v0, d0, p0-1-0, r0; Me v0-1-3, d0-0-1, p1-2-7, r0; ta v0, d0, p1-2-7, r0-2- 6. Palp: poorly developed PA poorly developed, embolus with two keels (PI and PS). Basal surface of tegulum smooth. BTA small in prolateral view and in the middle of tegulum width; prolateral tegulum with two denticles next PA and three denticles next to base of next to base of embolus; embolar bases thinner (Fig. 29 A–C). Distribution. BRAZIL. Mato Grosso: Chapada dos Guimar„es: Buriti (Map 3).

Published as part of Miglio, Laura Tavares, Pérez-Miles, Fernando & Bonaldo, Alexandre B., 2020, Taxonomic Revision of the Spider Genus Actinopus Perty, 1833 (Araneae, Mygalomorphae, Actinopodidae), pp. 1-256 in Megataxa 2 (1) on pages 34-37, DOI: 10.11646/megataxa.2.1.1, http://zenodo.org/record/5597237