Stethorrhagus sylvilagus Xavier, Brescovit & Bonaldo, 2025, sp. nov.

Stethorrhagus sylvilagus sp. nov. urn:lsid:zoobank.org:act: 253618EB-1F11-4270-962F-FC31BAF8E73C Figs 24–26, 51 Diagnosis Males of S. sylvilagus sp. nov. resemble those of S. loxodonta sp. nov., S. planada and S. hyula by the presence of a bifid VL and by the dVL not protruding, covered by long, thick modified hairs (Figs 19B, 21E, 22E, 25B, 26B; Bonaldo & Brescovit 1994: figs 17b, 19b), differing by the presence of a mVL. Particularly, they differ from those of S. loxodonta by the SePP and embolus separated at the base (SePP and embolus geminated at base in S. loxodonta – Fig. 19A); from those of S. planada by the tooth-like TP1 (Figs 25A, 26A) (TP1 represented by a wide, serrated keel in S. planada – Fig. 21C; Bonaldo & Brescovit 1994: fig. 17a) and from those of S. hyula, by the TP1 straight, pointing apically (Figs 25A, 26A) (TP1 curved, pointing prolaterally in S. hyula – Fig. 22D; Bonaldo & Brescovit 1994: fig. 19a). Females resemble those of S. callithrix sp. nov., S. planada and S. sciurus sp. nov. by the epigynum with VEP, CO disposed anteriorly in relation to SI, with a U-shaped posterior margin (Fig. 26C; Bonaldo & Brescovit 1994: fig. 18a). They differ from those of S. planada by the VEP gently procurved, placed posteriorly on epigynal plate (Fig. 25C) (VEP sub-rectangular, placed medially on epigynal plate in S. planada – Bonaldo & Brescovit 1994: fig. 18a); from those of S. callithrix by the CD relatively short (from CO to posterior margin of VEP, less than four times longer than the CO width – Fig. 25C) (in S. callithrix, long, more than six times longer than the CO width – Fig. 32C) and from those of S. sciurus by the bulging area between the posterior margin of VEP and the posterior margin of the epigynal ventral plate (Fig. 25C) (depressed in S. sciurus – Fig. 43C). Etymology The specific name is a noun in apposition in reference to the lagomorph genus Sylvilagus Gray, 1867, since the general conformation of the epigynum (as in Fig. 25C) resembles a cottontail rabbit head in frontal view. Material examined Holotype COLOMBIA • ♂; Huila, Parque Nacional Natural Nevado del Huila; [3°22′36”N, 74°48′08″ W]; elev. 3300 m; Sep. 1980; Páez leg., ICN-Ar 1648. Paratypes COLOMBIA – Caldas • 1 ♂; La Termal, Inderena, Belalcázar; elev. 2850 m; Oct. 1980; L. de Arévalo leg., IBSP 221891. – Huila • 1 ♀; same data as for holotype; ICN-Ar 13740. Description Male (holotype – ICN-Ar 1648) COLORATION. Cephalothorax and legs brown. Abdomen gray with two white central dorsal spots (Fig. 24A). Sternum with deep sternal excavations (Fig. 24C). MEASUREMENTS. Total length 7.36. Carapace 3.50 long, 2.72 wide. Clypeus 0.17. Leg measurements: I: femur 2.83/ patella 1.25/ tibia 2.64/ metatarsus 2.43/ tarsus 1.55/ total 10.70; II: 2.58/ 1.20/ 2.57/ 2.02/ 1.44/ 9.81; III: 2.37/ 1.01/ 1.84/ 2.14/ 1.20/ 8.26; IV: 2.95/ 1.05/ 2.65/ 3.15/ 1.39/ 11.19. Eye diameters: AME 0.19, ALE 0.16, PME 0.17, PLE 0.17. Chelicerae 1.75 long, with three promarginal teeth and four retromarginal denticles. LEG SPINATION. I – femur d1-1-0, p0-0-1, r0; tibia d0, p0, r0, v1p-2-2; metatarsus d0, p0, r0, v2-2-0. II – femur d1-1-0, p0-0-1, r0; tibia d0, p0, r0, v1r-2-0; metatarsus d0, p0, r0, v2-2-0. III – femur d1-1-0, p0- 1-0, r0-0-1; tibia d0, p1-1-0, r1-1-0, v2-2-2; metatarsus d0, p1-1-0, r1-1-1, v2-2-1. IV – femur d1-1-0, p0-0-1, r0-0-1; tibia d0, p1-1-0, r1-1-0, v2-2-2; metatarsus d0, p1-1-0, r1-1-0, v2-2-1. PALP. Retrolateral surface of femur and patellae with a cluster of modified hairs, tufts of modified hairs in vVL and dVL, median projection curved ventrally with subquadrangular tip between vVL and dVL, AS absent, DL reduced, VTA longer than wide, with distal surface C-shaped, spermophor situated prolaterally, TP1 straight, pointing apically, TP2 absent, SePP short, embolus long and curved prolaterally, prongs short (Figs 25A–B, 26A–B). Female (paratype – ICN-Ar 13740) COLORATION. As in male, except dorsum of abdomen with four central dorsal spots, anterior pair twice the size of posterior pair (Fig. 24B). Sternum with sternal excavations as in male but larger (Fig. 24D). MEASUREMENTS. Total length 11.05. Carapace 4.76 long, 3.67 wide. Clypeus 0.30. Leg measurements: I: femur 4.19/ patella 1.74/ tibia 3.77/ metatarsus 3.25/ tarsus 2.00/ total 15.05; II: 3.77/ 1.79/ 3.43/ 3.40/ 1.97/ 14.36; III: 3.62/ 1.20/ 2.69/ 2.80/ 1.55/ 11.86; IV: 4.42/ 1.76/ 3.90/ 5.08/ 1.96/ 17.12. Eye diameters: AME 0.27, ALE 0.22, PME 0.26, PLE 0.22. Chelicerae 2.19 long, with three promarginal teeth and four retromarginal denticles. LEG SPINATION. I – femur d1-1-0, p0-0-1, r0; tibia d0, p0, r0, v1r-2-2; metatarsus d0, p0, r0, v2-2-0. II – femur d1-1-0, p0-0-1, r0; tibia d0, p0, r0, v1p-2-2-2; metatarsus d0, p0, r0, v2-2-0. III – femur d1- 1-1, p0-1-1, r1-1-1; tibia d0, p1-1-0, r1-1-0, v2-2-2; metatarsus d0, p1-1-0, r1-1-0, v2-2-1. IV – femur d1-1-0, p0-0-1, r0; tibia d0, p1-1-0, r1-1-0, v2-2-2; metatarsus d0, p1-1-0, r1-1-0, v2-2-1. EPIGYNUM. Copulatory aperture U-shaped along posterior margin, CO disposed anteriorly in relation to spermathecae, VEP gently procurved, placed posteriorly on epigynal plate, area between posterior margin of VEP and posterior margin of epigynal plate bulging, PVP wider than long, covering SI, copulatory duct relatively short, from CO to posterior margin of VEP, less than four times longer than CO width (Figs 25C–D, 26C–D). Distribution Known only from the type locality (Fig. 51).