Stethorrhagus callithrix, Xavier & Brescovit & Bonaldo, 2025

Stethorrhagus callithrix sp. nov.

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Figs 31–33 View Fig View Fig View Fig , 51 View Fig

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 View Fig ), differing by the SePP with a pointed tip directed retrolaterally ( Figs 32A–B View Fig , 33A–B View Fig ) (SePP with a blunt tip directed apically in both S. felis and S. bradypus – Figs 35A–C View Fig , 38A View Fig , 36A–B View Fig , 39A–C View Fig ). 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 View Fig , 33C View Fig ; 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 View Fig ) (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 View Fig ) (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 View Fig , 43F View Fig ).

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 View Fig ) 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 .

GoogleMaps

Paratype

COLOMBIA • 1 ♀; same data as for holotype; ICN-Ar 13742 . GoogleMaps

Description

Male ( holotype – ICN-Ar 13741)

COLORATION. Carapace, chelicerae, endites and labium red-brown ( Fig. 31A View Fig ). Sternum yellow with orange borders, and deep sternal excavations ( Fig. 31C View Fig ). Legs yellow-brown. Abdomen brown with two rows of dorsal white paramedian spots ( Fig. 31A View Fig ).

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 View Fig , 33A–B View Fig ).

Female ( paratype – ICN-Ar 13742)

COLORATION. As in male ( Fig. 31B View Fig ). Sternum with sternal excavations as in male ( Fig. 31D View Fig ).

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 View Fig , 33C–D View Fig ).

Distribution

Known only from the type locality ( Fig. 51 View Fig ).