Eutichurus yungas Bonaldo & Ramírez, 2018

Bonaldo, Alexandre B., Lise, Arno A., Ramírez, Martín J. & Saturnino, Regiane, 2018, Revisiting the spider genus Eutichurus Simon, 1897 (Araneae, Eutichuridae): new species and complementary descriptions, Zootaxa 4382 (2), pp. 321-346 : 330-331

Eutichurus yungas Bonaldo & Ramírez , new species

Figs 15 ̄19, Map 1

Type material. Male holotype ( CBF) from Bolivia, La Paz, Sud Yungas [16°00’00.00”N 67°04’60.00”W], Lavi Grande, 15.XII.1991; female paratype ( CBF), same locality , 13.XII.1991; 2 male paratypes ( CBF), same data .

Etymology. The specific name is a noun in apposition taken from the type locality.

Diagnosis. Males of E. yungas n. sp. resemble those of E. pallatanga by the RTA split medially ( Bonaldo 1994: fig. 32) and those of E. lizeri by the cymbial insertion displaced retrolaterally (cymbium angled in relation to the longitudinal axis of tibia; not represented in Bonaldo 1994: fig. 38). They differ by the distally wide embolus, with a membranous, distally inserted prolateral process ( Figs 15 ̄17). Females are very similar to those of E. lizeri by the median field longer than wide, fused posterior plates and truncated anterior projections ( Bonaldo 1994: fig. 41), but can be distinguished by the anterior projections covering less than the anterior half of the posterior plates in ventral view and by the medially straight anterior margin of posterior plates (Fig. 18).

Description. Male (Holotype). Colour in ethanol: carapace orange, thoracic groove mark reddish. Chelicerae, endites and labium brownish red. Sternum yellow with brown margins. Legs yellow, tibia, metatarsi and tarsi orange. Chelicerae with 3 promarginal teeth, the second the largest, the last a denticle; and 4 retromarginal teeth, separated by twice their length. Tarsi I–IV with dense scopulae, and metatarsi III-IV with moderate scopulae. Total length 11.3. Carapace 5.5 long, 4.3 wide. Eye diameters: AME 0.23, ALE 0.28, PME 0.23, PLE 0.23. Eye interdistances: AME–AME 0.22, AME–ALE 0.32, PME–PME 0.31, PME–PLE 0.53, AME–PME 0.24, ALE–PLE 0.10, clypeus AME 0.17, clypeus ALE 0.18. Leg and palp measurements: palp 7.3 (2.8, 1.0, 1.2, -, 2.3); leg I 26.0 (6.6, 2.4, 6.6, 7.5, 2.9); leg II 24.5 (6.3, 2.4, 6.2, 7.0, 2.6); leg III 18.6 (5.3, 2.0, 4.2, 5.1, 2.0); leg IV 23.2 (6.4, 2.2, 5.5, 6.7, 2.4). Leg formula I-II-IV-III. Spination: palp femur: d 1-1-1; tibia r 1-1. Leg. I femur d 1-1-0, p 0-0-1, r 0; tibia d 0, p 0-0-1, r 0, v 2-2 -2; metatarsus d 0, p 0, r 0, v 2-2 -1. II—femur d 1-1-0, p 0-d1-d1, r 0; tibia d 0, p 0-0-1, r 0, v 2-2 -2; metatarsus d 0, p 0, r 0, v 2-2 -1. III—femur d 1-1-0, p 0-d1-d1, r 0-d1-d2; tibia d 0, p 1-1, r 1-1, v 2-2 - 2; metatarsus d p1r1-p1r1-p1r1, p 0-0-1, r 0-0-1, v 2-2 -1. IV—femur d 0-1-1, p 0-d1-d1, r 0-0-d2; tibia d 0, p 1-1, r 1-1, v 2-3 -2; metatarsus d p1r1-p1r1-p1r1, p 0-0-1, r 0-0-1, v 2-2 -1. Palp: tibia strong, two-thirds the cymbium length; RTA large, medially bifurcated; tegulum with apical projection near MA insertion; MA apically placed, sculptured, median projection small; conductor hyaline, long; embolus thick, inserted sub-basally, not fused to tegulum, embolar base wide, with sub-apical, membranous prolateral process and rounded retrolateral process ( Figs 15 ̄17).

Female (Paratype). Colour in ethanol: carapace reddish orange, cephalic region darker, thoracic groove mark reddish, chelicerae dark red. Endites and labium brownish red. Sternum yellow with brown margins. Legs yellow. Chelicerae with 3 promarginal teeth, the second the largest, and 4 retromarginal, closely placed teeth. Abdomen pale yellow. Tarsi I–IV and metatarsi I–II with dense scopulae; metatarsi III–IV with moderate scopulae. Total length 16.9. Carapace 5.7 long, 4.3 wide. Eye diameters: AME 0.21, ALE 0.26, PME 0.20, PLE 0.23. Eye interdistances: AME–AME 0.31, AME–ALE 0.40, PME–PME 0.47, PME–PLE 0.66, AME–PME 0.33, ALE–PLE 0.18, clypeus AME 0.20, clypeus ALE 0.19. Leg and pedipalp measurements: pedipalp 5.6 (1.9, 0.8, 1.2, -, 1.7); leg I 16.4 (4.4, 2.2, 3.9, 4.1, 1.8); leg II 15.4 (4.2, 2.1, 3.6, 3.8, 1.7); leg III 14.9 (3.9, 2.0, 3.7, 3.9, 1.4); leg IV 16. 6 (4.9, 1.9, 3.7, 4.4, 1.7). Leg formula IV-I-II-III. Spination: Pedipalp femur: d 0-0-2; tibia p 1-0; tarsi 1-1. Leg. I femur d 1-1-0, p 0-0-1, r 0; tibia d 0, p 0-0, r 0, v p1-2-0; metatarsus d 0, p 0, r 0, v 2-2 -0. II—femur d 1-1-0, p 0-1- 1, r 0; tibia d 0, p 0, r 0, v 0-p1-0; metatarsus d 0, p 0, r 0, v p1-2-1. III—femur d 1-1-0, p 0-d1-d1, r 0-0-d2; tibia d 0, p 1-1, r 1-1, v p1-p1-0; metatarsus d p1r1-p1r1-p1r1, p 0-0-1, r 0-0-1, v 2-2 -1. IV—femur d 2-1-0, p 0-0-1, r 0; tibia d 0, p 0-1, r 1-1, v p1-2-0; metatarsus d p1r1-p1r1-p1r1, p 0-0-1, r 0-0-1, v 2-2 -1. Epigynum: Median field narrow, longer than wide; anterior projections slightly smaller than posterior plates, with rounded apices; posterior plates sutured medially, anterior margins straight; primary spermathecae small, globular; secondary spermathecae small, tube-like (Figs 18, 19).

Distribution. Northern Bolivia (Map 1).

Other material examined. None.

Figures

FIGURES 15¯19. Eutichurus yungas new species. Male. 15 palp, ventral view; 16 embolus, prolateral view; 17 palp, retrolateral view.Female. 18 epigynum, ventral view; 19 epigynum, dorsal view.Scale bar = 0,25 mm.