Acanthoctenus spiniger Keyserling, 1877

Figs 10A, 11–14

Acanthoctenus spinigerus Keyserling, 1877: 693, plate 8, fig. 60 (male holotype from Mexico, Veracruz, Córdoba, [18º53’15.9”N, 96º56’03.2”W], deposited in NHM 1890.7.1.2924, examined).—F.O. Pickard-Cambridge 1897: 103, plate 4, fig. 3b—Mel-lo-Leit„o 1936: 192, fig. 12.— Forster & Wilton 1973: 293, fig. 1042.— World Spider Catalog 2020.

Acanthoctenus spiniger — Simon 1892: 229.— Silva-Dávila 2003: 49, fig. 19d.— World Spider Catalog 2020.

Other material examined. MEXICO. Veracruz: Orizaba, [18º51’01.7”N, 97º06’13.1”W], 1 male, 2 females, N. Banks coll. (MCZ) ; San Luis Potosí: Xilitla City, Las Pozas, 21º23’50”N, 98º59’38”W, 600 m. a.s.l., 1 female, 14–18.XI.2011, UNAM AracnoLab coll. (UNAM JAM231); Tamazunchale, [21º20’28.4”N, 98º57’49.9”W], 1 female, 23.XI.1946, E.S. Ross coll. (CAS) ; Chiapas: Selva el Ocote Biosphere Reserve, 32 Km NW Ocosocuautla, [16º59’35.5”N, 93º38’27.8”W], 762 m. a.s.l., 1 female, 27.VIII.1972, C. Mullinex & D.E. Breedlove coll. (CAS) .

Diagnosis. Males of Acanthoctenus spiniger (Figs 11 C–D, 12A–B) resemble those of A. virginea stat. res., comb. nov. (Figs 31 C–D, 32A–B) by the palpal tibia retrolaterally swollen and the RTA short, wider than long. It can be distinguished by the cymbial projection with a slightly anterior slope in ventral view and by the median apophysis with a wider than long proapical hook. Acanthoctenus virginea stat. res., comb. nov. presents a pronounced anterior slope in the cymbial projection and a longer than wide proapical hook in the median apophysis. Females of Acanthoctenus spiniger (Figs 12 C–D, 13C, 14A–B) resemble those of A. virginea stat. res., comb. nov. (Figs 32 C–D, 33C–D) by the median sector subpentagonal, but it can be distinguished by the anterior border of lateral sectors forming a 90° angle with the median sector longitudinal axis, and by the atrium subtriangular, whereas A. virginea stat. res., comb. nov. presents straight anterior border of the lateral sectors forming a 60° angle with the median sector longitudinal axis and a suboval atrium.

Description. Male (holotype NHB 1890.7.1.2924). Total length 11.30. Carapace 6.00 long and 5.00 wide. Clypeus 0.25 high. Eye diameters: AME 0.23, ALE 0.10, PME 0.30, PLE 0.25. Leg measurements: I: femur 8.00/ patella 4.00/ tibia 9.00/ metatarsus 8.40/ tarsus 2.80/ total 32.2; II: 7.00/ 4.00/ 7.00/ 7.00/ 2.00/ 27.00; III: 6.00/ 2.00/ 4.90/ 5.80/ 2.10/ 20.80; IV: 8.40/ 3.80/ 7.00/ 9.00/ 3.00/ 31.20. Leg formula 1423. Leg spination: tibia I and II v-2-2-2-2-2-2-2-2-2, p-1-1-0-1, r-1-0-1-1, III and IV v-2-2-2, r1-1, p1-1; metatarsus I and II v-2-2-2- 2-2, p-1-1-1, r-1-1, III v-1-1-1-1-1, p-1-1-1, r-1-1, IV v-1-1-1-1-1, p-1-1, r-1-1-1. Palp (Figs 11 C–D, 12A–B): tibia shorter than cymbium, swollen retrobasally; RTA with blunt tip; cymbium elongated and with retrobasal projection; embolus elongated, cylindrical, and curved; conductor hyaline and following the tip of embolus; median apophysis laminar and long, spatula-shaped, with a proapical hook.

Female (CAS, Chiapas). Total length 10.50. Carapace 4.92 long and 4.36 wide. Clypeus 0.28 high. Eye diameters: AME 0.20, ALE 0.14, PME 0.28, PLE 0.23. Leg measurements: I: femur 6.08/ patella 2.51/ tibia 6.90/ metatarsus 5.71/ tarsus 1.85/ total 23.05; II: 5.57/ 2.49/ 5.30/ 4.87/ 1.54/ 19.77; III: 4.24/ 1.57/ 3.68/ 4.46/ 1.39/ 15.34; IV: 5.62/ 2.16/ 5.46/ 6.68/ 2.08/ 22.00. Leg formula 1432. Leg spination: tibia I v-2-2-2-2-2-2-2-2-2, p-1-0- 1-1-1, r-0-1-0,1,1, II v 2-2-2-2-2-2-2-2-2, p-0-0-1-1, r-0-1-1-1, III v-2-2-2, p-1-1, r1-1-1, IV v-2-2-2, p-1-1, r 1-1; metatarsus I, II v-2-2-2-2-2, p-1, r-1, III and IV v-1-1-1-1, p-1-1-, r-1-1-1. Epigynum (Figs 12 C–D, 13C, 14A–B): median sector subpentagonal, wide anteriorly and extending into the atrium, projected posteriorly; anterior border of the lateral sectors strongly curved; atrium subtriangular, slightly sclerotized; copulatory ducts curved, S-shaped; spermathecae head quote-shaped, with apical glandular openings, spermathecae base curled; fertilization ducts tubular, slanting outwards.

Variation. Four females: total body length 10.50–16.20; carapace length 4.92–6.20.

Distribution. Central-east Mexico (Fig. 10A).