Bolostromus urku Dupérré 2023, new species
Creators: name: Dupérré, Nadine
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Cyrtaucheniidae
Bolostromus
Bolostromus urku

description: Bolostromus urku new species
Figs 50–52, map 2
Type material. Holotype male from Ecuador, Pichincha Province, La Union del Toachi, Otongachi Natural Reserve (-00.330510 -78.934420) 1087m, 25 Feb. 2020, pitfall, N. Dupérré, I.G. Tapia, E.E. Tapia (QCAZ). Paratypes: Ecuador: Pichincha Province: 2J, La Union del Toachi, Otongachi Natural Reserve (-00.330510 -78.934420) 1087m, 18 Feb. 2020, N. Dupérré, I.G. Tapia, E.E. Tapia (ZMH-A0015734, A0015735).
Etymology. The specific name is a non-Latin noun (invariable), taken from the Quechua language meaning small mountain, refering to the habitat.
Diagnosis. Males most resemble B. pristirana n. sp. but are distinguished by are straight fovea (Fig. 51A), procurved in the latter (Fig. 48A), tibia I without megaspine (Fig. 51D) present in B. pristirana n. sp. (Fig. 48D).
Description. Male (holotype): Total length: 2.90; carapace length: 1.56; carapace width: 1.36; carapace height: 0.78; abdomen length: 1.34. CEPHALOTHORAX: Carapace elongated hexagonal; margin sinuous; pars cephalica dark brown, reticulate; pars thoracica, lighter brown, reticulate; cephalic groove shallow, with pit medially; fovea broad, straight (Fig. 51A); caput not strongly elevate (Fig. 51C). Clypeus: 0.09. Sternum 1.04/0.86, orange-brown, strongly reticulate; sigillae oval (Fig. 51B). Labium orange-brown; without cuspule. Endites quadrangle; orange-brown with seven cuspules; serrula not observed. Chelicerae dark reddish-brown; promargin five teeth and 14 denticles; rastrellum with 6–7 spines. EYES: AME: 0.08; ALE: 0.12; PLE: 0.08; PME: 0.04; interdistances: AME: 0.03; ALE-ALE: touching; PME: 0.14; PME-PLE: 0.02; LE: 0.02; ocular quadrangle: 0.41/0.42/0.19. ABDOMEN: Oval; dorsally beige with dark pattern consisting of two broken chevrons posterior half; ventrally uniformly beige (Fig. 50A, B). Spinnerets: median spinnerets: 0.14; lateral spinnerets: 0.24/0.17/0.25. LEGS: Uniformly light brown. Coxae I–II without inner short stiff setae. Metatarsi I broader apically, with thin apical half scopulae; tarsi I–II with thin full scopulae (Fig. 51D); Metatarsi II with thin apical half scopulae; leg III, IV without scopulae. Tarsal claw teeth (3/5) (3/7) (2/3) (3/4). LEGS MEASUREMENTS: I 4.98 (1.42/0.67/1.22/0.91/0.67); II 4.04 (1.2 1/0.51/0.94/0.76/0.62); III 3.14 (0.97/0.41/0.59/0.63/0.54); IV 4.58 (1.31/0.48/1.16/0.97/0.66); leg formula: 1423. LEGS SPINATION: femur I, II, III (0); IV 1-1-4d; patellae I, II, IV (0); III with 6pd; tibia I 1-2v; II 1v; 1vap; III 1p; 1d, 1v, 3vap; IV 1-2v, 2vap; metatarsus I (0); II 1-1; 1vap; III 1p, 1-2d, 3d; 2vap; 1r; IV 1-2v, 2vap; tarsus I–IV (0). GENITALIA: Palp measurements: 0.80/0.36/0.610.37; bulb: 0.34/0.15. Palpal tibia wider basally; cymbium with four spines apically (Fig. 52A, B); bulb elongated with small constriction; embolus short and sinuous (Fig. 52C–E).
Female: Unknown.
Distribution. Only found at the type locality in Pichincha Province, Ecuador.
Natural history. Specimens were collected by pitfalls trap in a low evergreen forest.
description: Published as part of Dupérré, Nadine, 2023, Review of the American genus Bolostromus Ausserer, 1875 with the description of fourteen new species (Araneae, Cyrtaucheniidae), pp. 1-88 in Zootaxa 5317 (1) on pages 66-67, DOI: 10.11646/zootaxa.5317.1.1, http://zenodo.org/record/8153783