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

Stethorrhagus callithrix sp. nov. urn:lsid:zoobank.org:act: E70E900E-0627-459D-A648-9BA96D0FD16C Figs 31–33, 51 Diagnosis Males of S. callithrix sp. nov. resemble those of S. felis sp. nov. and S. bradypus sp. nov. by the bifid VL, with thick modified hairs in both vVL and dVL, and dVL protruding (Fig. 33B), differing by the SePP with a pointed tip directed retrolaterally (Figs 32A–B, 33A–B) (SePP with a blunt tip directed apically in both S. felis and S. bradypus – Figs 35A–C, 38A, 36A–B, 39A–C). Females resemble those of S. sylvilagus sp. nov., S. planada and S. sciurus sp. nov. by the epigynum with VEP, CO disposed anteriorly in relation to SI, with U-shaped posterior margin (Figs 32C, 33C; Bonaldo & Brescovit 1994: fig. 18a). They differ from those of S. planada by the VEP gently procurved, placed posteriorly on the epigynal plate (Fig. 33C) (VEP sub-rectangular, placed medially on the epigynal plate in S. planada – Bonaldo & Brescovit 1994: fig. 18a) and from those of S. sylvilagus and S. sciurus by the CD relatively long (from CO to posterior margin of VEP, more than six times longer than the CO width, Fig. 33D) (CD relatively short, from CO to posterior margin of VEP, less than four times longer than the CO width in both S. sylvilagus and S. sciurus – Figs 26D, 43F). Etymology The specific name is a noun in apposition in reference to the primate genus Callithrix Erxleben, 1777, since the posterior sector of the epigynum (as in Fig. 32C) resembles a marmoset head in frontal view. Material examined Holotype COLOMBIA • ♂; Cauca, Huila, Parque Nacional Natural Nevado de Huila; [3°03′26″ N, 75°55′23″ W]; elev. 3300 m; Sep. 1980; Páez leg.; ICN-Ar 13741. Paratype COLOMBIA • 1 ♀; same data as for holotype; ICN-Ar 13742. Description Male (holotype – ICN-Ar 13741) COLORATION. Carapace, chelicerae, endites and labium red-brown (Fig. 31A). Sternum yellow with orange borders, and deep sternal excavations (Fig. 31C). Legs yellow-brown. Abdomen brown with two rows of dorsal white paramedian spots (Fig. 31A). MEASUREMENTS. Total length 6.94. Carapace 3.36 long, 2.71 wide. Clypeus 0.15. Leg measurements: I: femur 2.84/ patella 1.21/ tibia 2.81/ metatarsus 2.47/ tarsus 1.7/ total 11.03; II: 2.70/ 1.11/ 2.32/ 2.28/ 1.68/ 10.09; III: 2.56/ 1.10/ 1.90/ 2.33/ 1.17/ 9.06; IV: 3.35/ 1.18/ 2.81/ 3.47/ 1.61/ 12.42. Eye diameters: AME 0.20, ALE 0.19, PME 0.19, PLE 0.18. Chelicerae 1.81 long, with three promarginal teeth and five retromarginal denticles. LEG SPINATION. I – femur d1-1-0, p0-0-1, r0; tibia d0, p0, r0, v1p-2-2-2; metatarsus d0, p0, r0, v2-2-0. II – femur d1-1-0, p0-0-1, r0; tibia d0, p0, r0, v0-2-2; metatarsus d0, p1-1-1, r1-1-1, v2-1p-2. III – femur d1-1-1, p1-1-1, r0-1-1; tibia d0, p1-1-0, r1-1-0, v2-2-2; metatarsus d0, p1-1-0, r1-1-0, v2-2-2. IV – femur d1-1-1, 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. RTA with vVL and dVL with modified hairs, dVL longer than vVL, AS present and separated from VL, DL reduced, VTA longer than wide, spermophor situated prolaterally, TP1 bilobated and serrated, situated abovedistal fold of spermophor, TP2 absent, SePP with pointed tip directed retrolaterally, embolus long, curved prolaterally in ventral view and curved dorsally in retrolateral view, prongs long and curved apically (Figs 32A–B, 33A–B). Female (paratype – ICN-Ar 13742) COLORATION. As in male (Fig. 31B). Sternum with sternal excavations as in male (Fig. 31D). MEASUREMENTS. Total length 9.02. Carapace 3.43 long, 2.65 wide. Clypeus 0.19. femur 2.89/ patella 1.26/ tibia 2.57/ metatarsus 2.36/ tarsus 1.52/ total 10.60; II: 2.88/ 1.18/ 2.35/ 2.12/ 1.50/ 9.95; III: 2.68/ 1.08/ 1.93/ 2.19/ 1.26/ 9.14; IV: 3.41/ 1.28/ 3.01/ 3.63/ 1.43/ 12.76. Eye diameters: AME 0.23, ALE 0.2, PME 0.20, PLE 0.21. Chelicerae 1.48 long, with three promarginal teeth and five retromarginal denticles. LEG SPINATION. I – femur d1-1-0, p0-0-1, r0; tibia d0, p0, r0, v1p-2-2-2; metatarsus d0, p0, r0, v2-2-0. II – femur d1-1-0, p0-0-1, r0; tibia d0, p0, r0, v1r-2-2; metatarsus d0, p0, r0, v2-2-0. III – IV - femur d1-1-1, p0-0-1, r0-0-1; tibia d0, p1-1-0, r1-1-0, v2-2-2; metatarsus d0, p1-1-1, r1-1-1, v2-2-1. EPIGYNUM. CO disposed anteriorly in relation to spermathecae, copulatory aperture U-shaped along posterior margin, VEP gently procurved, placed posteriorly on epigynal plate, PVP wider than long, covering ⅔ of SI, PVP with slightly procurved notch along anterior margin, copulatory duct relatively long, with reinforcement rods anterior to CO (Figs 32C–D, 33C–D). Distribution Known only from the type locality (Fig. 51).