Actinopus itaqui sp. nov. Figs 89–91, Map 5 Type material. Holotype male from [29° 07’ S 56° 33’ W], Itaquí, Rio Grande do Sul, Brasil, 24.i.1995, M. C. de Paula leg. (MCN 26526). Etymology. The specific name is a noun in apposition from the type locality name, Itaquí, Rio Grande do Sul. Diagnosis. The male resembles those of A. caxiuana, A. ipioca and A. nattereri by the palpal tibia paler than other articles and differ from those of all other species, except A. nattereri (Fig. 67 A–C), A. rufipes (Fig. 72 A–C), A. vilhena (Fig. 37 A–D), A. harveyi (Fig. 75 A–C), A. itapitocai (Fig. 37 A–D), A. xingu (Fig. 94 A–C), A. mesa (Fig. 97 A–C) and A. caxiuana (Fig. 100 A–C), by the combined presence of three keels, small-serrated area along the inferior keel and robust body. Males resemble those of A. harveyi and A. xingu by PA connected to PAc and A. nattereri by bluish spot over the entire dorsal abdomen and differ from those of A. nattereri and A. harveyi by the larger PA; from A. mesa by the absence of swelling above PA and by the triangular tegulum; from A. nattereri, A. rufipes, A. vilhena, A. itapitocai, A. mesa and A. caxiuana by PA continuous to PI. It resembles those of A. caxiuana by PS in a horizontal line along prolateral tegular surface, with a larger spacing between PS-PI and differ by the more developed PI. MALE (MCN 26526): Total length 13.75; Carapace, long 7.5; wide 6.88. Carapace anterior part tapering. Anterior eye row slightly procurved, posterior row recurved (Fig. 89 B). Without bristles between AMEclypeus and one bristle ALE–PLE. Sternum with eight sigilla fused medially, all sigilla very fused to each other (Fig. 89 C). Rastellum protuberant, inverted V-shaped, hirsute, without spines in apex (Fig. 89 E, F). Chelicerae with many denticles along prolateral row and some denticles between basal teeth on retrolateral row (Fig. 89 D). Patella and tibia III with distal crown of well developed thorns (Fig. 90 A, B). Patellae III and IV with spines on prolaterodorsal face (Fig. 90 A, C). Tibia IV without spines on dorsal surface and with two visible rows of trichobothria (Fig. 90 D). Without ventral pseudoscopulae in tarsi I, ventral pseudoscopulae occupying 30% of II and 100% of III and IV. Pseudoscopula of tarsi II with setae widely spaced, forming diffuse group of bristles, on tarsi III and IV, compact. Carapace and chelicerae brown, sternum reddish brown, coxae, trochantera, femora, patellae, tibiae, metatarsi and tarsi of legs reddish brown; tibia of palp pale reddish brown, clearer than other articles; Abdomen gray with big metalic blue spot in dorsal view (Fig. 89 A). Eyes: Diameters: PME 0.28 PLE 0.4 ALE 0.44, AME 0.44; MOQ: Length 1.16, front width 3.32, back width 2.96; Interdistances: PME–PME 1.84, PLE–PME 0.2, AME–AME 0.2, ALE–AME 0.8, ALE–PLE 0.52, AME–PME 0.6. Ocular area: OAL 5.12, OAW 4.37, and IF 2.25. Body: Clypeus: 0.25; Fovea: 3; Labium: long 1.5; wide 1.25; Chelicerae: long 3; wide 2.25; Sternum: long 4.87; wide 4.25. Abdomen: long 6.87; wide 5.25. Leg measurements: I: Fe 6.62/ Pa 3.12/ Ti 2.87/ Me 4.62/ Ta 2.37/ total 19.62. II: 6.25/ 3.12/ 3.37/ 4.75/ 2.5/ 20. III: 5.125/ 3.25/ 2.62/ 5.5/ 3/ 19.5. IV: 7/ 3.5/ 5.5/ 6.25/ 2.87/ 25.12. Formula 4123. Spination: I—Fe v0, d0, p0, r0; Pa v0-0-1, d0, p0, r0; ti v0, d0, p0, r0; Me v0-3-3, d0, p3-3-3, r0-3-2; ta v0, d0, 2-4-4, r1-5-7. II—Fe v0-0-1, d0, p0, r0; Pa v0-0-2, d0, p0, r0-6-5; ti v1- 0-4, d0, p0-2-3, r1-2-2; Me v0-1-3, d0, p1-2-2, r0-2-5; ta v0-2-2, d0, p3-4-3, r0-6-6. III—Fe v0, d0, p0, r0; Pa v0, d9-23-34, p1-2-3, r0-0-2; ti v0-0-2, d1-0-12, p0-0-1, r0-1- 3; Me v0-0-4, d2-3-3, pv1-3-4, r0-2-6; ta v0, d0, p0-7-5, r0-5-4; IV—Fe v0, d0, p0, r0; Pa v0, d14-12-4, p0-11-6, r2-0-0; ti v0-0-2, d0, p0-1-2, r0; Me v0-2-3, d0, p1-6-7, r0; ta v0, d0, p3-8-11, r0-1-5. Palp: PA well-developed continuous of PAc. Embolus with three keels (PAc, PI and PS). BTA developed, placed medially on prolateral tegular surface; inferior surface of tegulum below PI with two denticles in area of serrated area; embolar base thin (Fig. 91 A–C). Distribution. BRAZIL. Rio Grande do Sul: Itaquí (Map 5).

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 101-102, DOI: 10.11646/megataxa.2.1.1, http://zenodo.org/record/5597237