Actinopus echinus Mello-Leitão, 1949 Figs 210–212, Map 16 Actinopus echinus Mello-Leitão, 1949: 1 (holotype ♀, Confluence of the river Koluene with river Xingu, Reserva Indígena do Xingu, northeast of Gaúcha do Norte, Mato Grosso, Brazil, MNRJ, lost in assault on transport truck); World Spider Catalog, 2020. Note. The material examined can be identified as A. echinus by the following characters which are congruent with the original description: arrangement of cheliceral teeth, spines of rastellum and position and size of eye. Diagnosis. Females of A. echinus can be identified by the following combination of characters: unilobed seminal receptacles, which are subquadrate in shape and parallel to each other (Fig. 212); PLE three times larger than PME; carapace with parallel lateral margins of cephalic region (Fig. 210 B). FEMALE (IBSP 102907): Total length 20.86; Carapace, long 9.93; wide 10.26. Carapace anterior part square and posterior part triangular. Anterior eye row procurved, posterior row recurved. Long and short bristles between AME-clypeus, rare and widespread on interdistances PME–PME and PLE–PLE. Short bristles between lateral eyes-edge of carapace (Fig. 210 B). Sternum with eight sigilla fused medially, two distal sigilla more fused to each other than others (Fig. 210 C). Rastellum protuberant, rectangular, hirsute, with many dorsal spines (Fig. 210 E–F). Prolateral row of Chelicerae teeth with teeth decreasing on distal-proximal way. Denticles widespread along Prolateral row (Fig. 210 D). Patella III and IV and Tibia III with distal developed crowns of thorns (Fig. 211 A–C). Patella III and IV with prolaterodorsal short spines along extension of article (Fig. 211 A, C). Tibia IV without spines and with long bristles on prolaterodorsal surface (Fig. 211 D). Many robust spines on the distal parts of the prolateroventral and retrolateroventral surfaces of tarsi III; and in the ventral and prolateral surfaces of tarsi IV; and prolateral and retrolateral surfaces of tarsi and metatarsi I and II. Reddish brown carapace with a diffuse orangish region extending from the posterior area of AME to chilum (Fig. 210 B). Reddish-brown Chelicerae with a row of dorsal bristles disposed on a region yellowish; sternum orangish; legs with coxae, trochanters and femora reddish-brown and the rest of articles orange; brown abdomen with a big spot of unpigmented area on dorsal surface (Fig. 210 A). 58 labial cuspules, 231 on right maxilla and 165 on left. Eyes: Diameters: PME 0.29, PLE 0.52, ALE 0.47, AME 0.31; MOQ: Length 1.67, front width 1.45, back width 3.26; Interdistances: PME–PME 2.6, PLE–PME 0.22, AME–AME 0.67, ALE–AME 1.46, ALE–PLE 1.18, AME–PME 1.12. Ocular area: OAL 7.88, OAW 5.97, and IF 4.43. Body: Clypeus: 0.37; Fovea: 3.97; Labium: long 3.26; wide 2.37; Chelicerae: long 5.9; wide 4.27; Sternum: long 7.42; wide 6.47.Abdomen: long 11.7; wide 8.05. Leg measurements: I: Fe 6.06/ Pa 4.33/ Ti 3.04/ Me 3.5/ Ta 1.61/ total 18.54. II: 6.43/ 4.39/ 2.89/ 4.1/ 2.18/ 19.99. III: 4.83/ 4.9/ 1.26/ 3.1/ 1.15/ 15.24. IV: 7.39/ 5.1/ 3.8/ 3.04/ 1.27/ 20.6. Fórmula 4123. Spinulation: I—Fe v0, d0, p0, r0; Pa v0, d0, p0, r0; ti v0-1-3, d0, p0-0-8, r8- 29-16; Me v3-5-4, d0, p10-15-4, r6-11-7; ta v1-0-3, d0, p5-9-4, r4-5-3. II—Fe v0, d0, p0, r0; Pa v0, d0, p0, r0; ti v0, d4-42-9, p0-0-3, r11-27-20; Me v0-3-2, d0, p9-12-6, r7-14-11; ta v0-0-3, d0, p8-9-5, r6-7-9. III—Fe v0, d0, p0, r0; Pa v0, d0-0-35, p0, r0-0-10; ti v0, d1-0-19, p7-9-12, r0; Me v0-0-5, d0-5-3, p0, r10-14-11; ta v19-29-10, d0-4- 2, p0-4-7, r9-15-8; IV—Fe v0, d0, p0, r0; Pa v0, d2-0-22- 9, p7-10-3, r0; ti v0, d0, p0, r0; Me v0-0-2, d0-2-1, p0-1- 4, r0; ta v8-7-12, d0-1-2, p0-5-8, r0-0-1. Spermathecae: Subquadrates seminal receptacles, one parallel to each other, as long as wide, with short duct. Left receptacle with sclerotized region reaching the half of the receptacle. In dorsal view, right receptacle without sclerotized area in the basal region, pores distributed asymetrically (Fig. 212 A). Distribution. BRAZIL. Mato Grosso; and Mato Grosso do Sul: Brilhante (Map 16). Examined material: BRAZIL: Mato Grosso do Sul: Brilhante, [21° 48’ 0” S 54° 32’ 59.9994” W], 1♀, 1952, D. Mariano leg. (IBSP 102907).

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 232-234, DOI: 10.11646/megataxa.2.1.1, http://zenodo.org/record/5597237