Dobarakuku ursus ( Carico, 1976 ), 2025

Dobarakuku ursus ( Carico, 1976) comb. nov.

( Figs 2–5 View FIGURE 2 View FIGURE 3 View FIGURE 4 View FIGURE 5 )

Tinus ursus Carico, 1976: 75 View in CoL , figs 7, 30–31 (female holotype from Rincón de Osa, Costa Rica, 27.ii.1967, C.E. Valeiro leg., deposited in MCZ 23414, examined through photographs of the habitus and genitalia; paratypes: five ♀, same data as holotype, deposited in Museo de Zoología, University of Costa Rica, not examined); World Spider Catalog 2025.

Material examined. COLOMBIA: Valle del Cauca: Buenaventura, Reserva Natural Venado Verde , 3.81717808, -76.894535, 144 m, 19.ii.2024, J. Cabra leg., 1♂ 1♀, (MUSENUV-Ar 3323) GoogleMaps ; same locality and date, M. Espinosa leg., 1♂ 1♀ (MUSENUV-Ar 3324) GoogleMaps ; same data as previous, 1♂ (MUSENUV-Ar 3329), 9♀ (MUSENUV-Ar 3331); 1♂ (MUSENUV-Ar 3332) GoogleMaps ; same locality data, 11-13.v.2024, S. Perlaza leg., 1♂ 1♀ (MUSENUV-Ar 3325) GoogleMaps ; same data as previous, 1♂ 1♀ (MUSENUV-Ar 3326), 1♀ (MUSENUV-Ar 3327), 1♀ (MUSENUV-Ar 3328), 1♀ (MUSENUV-Ar 3330), 1♂ 1♀ (ICN-Ar 13830) GoogleMaps .

Diagnosis. As for the genus, which is monotypic.

Description. Male (MUSENUV-Ar 3323). Carapace 4.05 long, 3.35 wide, pale yellow. Clypeus yellowish with two darker lateral marks located between the AME and ALE, 0.25 high. Anterior eye row 0.95 wide; posterior eye row 1.55 wide. AME 0.19, ALE 0.12, PME 0.22, PLE 0.17; AME-AME 0.12, AME-ALE 0.09, PME-PME 0.32, PME-PLE 0.35, MOQ 0.67 long, anterior width 0.47, posterior width 0.75. Chelicerae cylindrical, reddish brown, with two promarginal teeth located at the base and three subequal retromarginal teeth, two of which are positioned near the distal part and one at the base. Sternum yellowish with six dark marks in the lateral margins covered with setae; 1.8 long, 1.95 wide. Labium reddish, darker in the base; 0.6 long, 0.65 wide. Legs yellowish, relative length: II-I-IV-III, I - femur 6.5/ tibia-patella 8.75/ metatarsus 7.5/ tarsus 2.8/ total 25.55; II - femur 7.0/ tibia-patella 9.5/ metatarsus 7.25/ tarsus 3.1/ total 26.85; III - femur 3.5/ tibia-patella 5.0/ metatarsus 3.7/ tarsus 1.6/ total 13.8; IV - femur 6.75/ tibia-patella 8.15/ metatarsus 7.2/ tarsus 2.7/ total 24.8. Opisthosoma 4.15 long. Total length 8.05. Palp ( Figs 3A, B View FIGURE 3 , 4 View FIGURE 4 ); description as for genus.

Female (MUSENUV-Ar 3323). Carapace 4.15 long, 3.5 wide, general coloration pattern as the male. Clypeus 0.25 high. Anterior eye row 1.0 wide; posterior eye row 1.55 wide. AME 0.19, ALE 0.14, PME 0.20, PLE 0.16; AME-AME 0.15, AME-ALE 0.08, PME-PME 0.32, PME-PLE 0.37, MOQ 0.65 long, anterior width 0.52, posterior width 0.74. Chelicerae coloration as the male, with three equidistant promarginal teeth, the basal tooth being half the length of the other two. Three subequal retromarginal teeth, with two positioned closer to the distal part and one at the base. Sternum yellowish with pale dark marks as described for the male; 1.77 long, 1.92 wide. Labium reddish brown; 0.55 long, 0.70 wide. Legs yellowish, relative length: IV-I-II-III, I - femur 6.05/ tibia-patella 8.85/ metatarsus 6.55/ tarsus 2.5/ total 23.95; II - femur 6.15/ tibia-patella 8.35/ metatarsus 6.25/ tarsus 2.4/ total 23.15; III - femur 4.75/ tibia-patella 5.55/ metatarsus 3.85/ tarsus 1.45/ total 15.6; IV - femur 6.75/ tibia-patella 8.1/ metatarsus 6.8/ tarsus 2.55/ total 24.2. Opisthosoma 5.0 long. Total length 9.0. Epigynum ( Fig. 3C, D View FIGURE 3 ); description as for genus.

Variation. Males (n = 4): carapace length 3.67–4.15 (mean = 3.84), carapace width 3.45–3.25 (mean = 3.35). Females (n = 16) carapace length 3.25–4.35 (mean = 3.79), carapace width 3.22–3.77 (mean = 3.41).

Distribution. As described for the genus ( Fig. 5 View FIGURE 5 ).

Natural history. We observed these spiders suspended over the middle of streams, attached to a single silk thread, with their front legs touching the water (Supplementary Material, Video S2), presumably in an attempt to catch prey. The individuals secure the distal end of the silk to a leaf or branch above the stream, then descend until legs I and II contact the water. Other individuals were seen on vegetation, trees, and rocks along the stream margins, with some positioning their legs on the water in a similar manner. Females carry the egg-sac in their chelicerae.