Eutichurus tibacuy, Casas & Villarreal-Blanco & Morales & Osorio & Martínez, 2025

Eutichurus tibacuy sp. nov.

Figs 15 View FIGURE 15 , 16 View FIGURE 16 , 29H View FIGURE 29 , 30H View FIGURE 30 , 32–34 View FIGURE 32 View FIGURE 33 View FIGURE 34

Type material. Holotype: COLOMBIA, Cundinamarca: 1♂, Tibacuy, Reserva Cerro Quininí, Piedra de Los Partos ( 4°19′31.91″ N; 74°29′34.67″W), 1760 m, 23.VII.2022, W. Galvis leg. (MPUJ_ENT0087167) GoogleMaps Paratypes: COLOMBIA, Cundinamarca: 2 ♀, same locality as holotype, 23.VII.2022, W. Galvis leg (MPUJ_ENT0087165, UARC:AR203) GoogleMaps ; 1♂, same locality as previous specimens, Reserva Cerro Quininí ( 4º19’31.91”N; 79°29’34.67”W), 1640, 23.X.2015, Grupo de Artropofauna Universidad Nacional de Colombia leg. (ICN–Ar–13729) GoogleMaps .

Etymology. The specific name refers to the type locality; noun in apposition.

Diagnosis. Males of Eutichurus tibacuy sp. nov. are similar to those of Eutichurus putus O. Pickard-Cambridge, 1898 and Eutichurus sigillatus Chickering, 1937 by having a trifid retrolateral tibial apophysis (see Bonaldo 1994: 155, figs 84–86, 89–91; Fig. 16B–C View FIGURE 16 ). However, they can be distinguished by the shape of dorsal branch of the retrolateral tibial apophysis, which is very short, wide at the base, and straight; by the medial and ventral branches, which are shorter and less sharp; and by the embolus, which has a sharp and long prolateral tip ( Figs 15A–C View FIGURE 15 , 16AC View FIGURE 16 ). Females resemble those of Eutichurus sigillatus Chickering, 1937 and Eutichurus yariguies sp. nov. by having W-shaped anterior margins on the posterior plates and secondary spermathecae oval, well-developed, larger than the primary spermathecae ( Bonaldo 1994: 155, figs 87–88; Figs 15D–E View FIGURE 15 , 16E–F View FIGURE 16 ). They differ from the previous species by having broader anterior projections that extend obliquely and touch the anterior portion of the median field (smaller and very distally separated in Eutichurus yariguies sp. nov.). Also, the median field has a subtriangular median depression (absent in Eutichurus yariguies sp. nov. and with a protuberance in Eutichurus sigillatus ; Figs 15D–E View FIGURE 15 , 16E–F View FIGURE 16 ).

Description. Male holotype (MPUJ_ENT0087167). Coloration in ethanol: carapace uniformly light brown slightly darker on cephalic and ocular region with thin thoracic groove mark brown.Chelicerae with the paturon brown and fangs reddish brown. Endites and labium brown. Sternum light brown. Legs: I–IV as carapace. Opisthosoma: pale yellow, dorsally and ventrally covered with fine black setae, with a dense patch of black setae rounded the tracheal spiracles and lungs opening. Spinnerets pale-yellow. Tarsi I–IV with dense scopulae, and metatarsi III–IV with moderate scopulae. Measurements: total length 14.51, carapace length 6.69, width 4.96, height 1.68. Clypeus height 0.31. Eye diameters and interdistances:AME 0.48, ALE 0.57, PME 0.38, PLE 0.40; AME–AME 1.17, AME– ALE 1.08, AME–PME 0.94, PME–PME 1.25, PME–PLE 1.09, ALE–PLE 0.76. Chelicerae length 3.64, with four promarginal and retromarginal teeth. Sternum length 2.51, width 1.98. Legs: I—femur 8.24/ patella 2.76/ tibia 7.59/ metatarsus 8.92/ tarsus 3.35/ total 30.86; II—6.71/ 2.31/ 5.90/ 6.85/ 2.76/ 24.53; III—6.88/ 1.98/ 5.46/ 6.71/ 2.52/ 23.55; IV—lack. Opisthosoma length 7.76. Legs and palp macrosetae pattern: palpal femur d 1-0-1, tibia p 1-0-1. I—femur d 1-0-1, p 0-1d-1d, r 0-1d-1d; tibia v 2-2-2, p 0-0-1d; metatarsus v 2-0-2-1p, p 0-0-1d. II=I. III—femur d 0- 0-1, p 0-1d-1d, r 1d-1d-1d; tibia v=I, p 1-1, r 1-1; metatarsus v 2-2-1p, d p1r1-p1r1-p1r1, p 0-0-1, r 0-0-1; IV—lack. Palp: cymbium shorter than the tibia length; retrolateral process of the cymbium poorly developed; tegulum oval, longer than wide; conductor hyaline, thin; embolus long, flattened, inserted sub-medially on the tegulum, apically bifid; spermatic ducts wide, S-shaped in ventral view; median apophysis small and curved towards the proximal side of the bulb; trifid retrolateral tibial apophysis, with the dorsal branch being wider than the others, the medial branch longer and sharper, and the ventral branch smaller and thinner than the medial ( Figs 15A–C View FIGURE 15 , 16A–C View FIGURE 16 ).

Female ( MPUJ_ENT0087165). Coloration in ethanol: Same as male. Chelicerae same as male. Measurements: Total length14.14,carapace length 5.97, width4.51,height 2.06Clypeus height0.08.Eye diameters and interdistances: AME 0.32, ALE 0.28, PME 0.29, PLE 0.25; AME–AME 1.02, AME–ALE 1.10, AME–PME 0.80, PME–PME 1.22, PME–PLE 1.13, ALE–PLE 0.52. Chelicerae length 2.17. Sternum length 2.62, width 2.39. Legs: I—femur 5.00/ patella 2.14/ tibia 5.09/ metatarsus 5.01/ tarsus 1.76/ total 19; II—4.76/ 2.03/ 4.67/ 4.71/1.69/ 17.86; III—3.69/ 1.95/ 3.47/ 3.72/ 1.63/ 14.46; IV—4.78/ 2.17/ 4.47/ 5.07/ 4.76/21.35. Opisthosoma length 8.17. Legs and palp macrosetae pattern: palpal femur d 0-1-1, tibia p 0-1-1, metatarsus p 1-1-1. I—femur d 1-0-1, p 0-0-1; tibia v 1p-2-2; metatarsus v 2-1r- 1p. II—femur d=I, p 0-1-1; tibia v0-2-0; metatarsus v2-1p-1. III—femur d 1-0-1, p 0-1d-1d, r 1d-1d-1d; tibia v0-1p-0, p 1-0-1, r 0-0-1; metatarsus v 2-2-1, d p1r1-p1r1-p1r1, p 0-0-1, r 0-0-1; IV—femur d 1-0-1, p0-1d-1d, r 0-0-1; tibia v 1-2-1r, p 0-0-1; metatarsus IV=III. Epigyne: median field slightly wider than longer and rhomboid in shape, with a triangular depression; anterior projections broad, subtriangular, extending obliquely to touch the anterior portion of the median field; posterior plates fused and bulged, with a median suture; primary spermathecae small and rounded; secondary spermathecae oval, much larger than the primary spermathecae, spermathecae stalk broad, slightly thinner as they approach the primary spermathecae; fertilization ducts hardly longer than the diameter of the primary spermathecae and inserted anteriorly ( Figs 15D–E View FIGURE 15 , 16E–F View FIGURE 16 ).

Distribution. Only known from the type locality in Cundinamarca department ( Figs 32–34 View FIGURE 32 View FIGURE 33 View FIGURE 34 ).