Bolostromus riveti Simon 1903
Creators: name: Dupérré, Nadine
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Cyrtaucheniidae
Bolostromus
Bolostromus riveti

description: Bolostromus riveti Simon, 1903
Figs 19–23, map 2
Bolostromus riveti Simon, 1903 j: 314 (Description male).
Bolostromus riveti Berland, 1913b: 81, pl. 7, f. 1–2 (re-illustration of the male type).
Type material. ♁ long. 12–14 mill. Ecuador: Riobamba. Examined. Label 1. Museum Paris AR 4242, 694 Bolostromus riveti E.S., Ec. Riobamba (Rivet).
Additional material. ECUADOR: Pichincha Province: Quito, Lirios de Carcelen (0° 05’ 06.68’’ -78° 27’ 27.26’’) 2595m, 6 March 2017, 1 ♁, hand collecting, sifting litter, E.E. Tapia, A. Tapia, I. Tapia (QCAZ).
Type designation. One male lectotype designated here [AR4242].
Diagnosis. Males are distinguished from all species by their dorsal abdominal pattern (Figs 19A, 21A), leg I with two retro-apical tibial megaspines, and a group of short modified setae on metatarsi I (Figs 20A, 22A, arrows).
Description. Male (Quito): Total length: 7.69; carapace length: 3.93; carapace width: 3.11; carapace height: 1.94; abdomen length: 3.76.
CEPHALOTHORAX: Carapace almost rectangular slightly wider anterio-medially, margin sinuous; pars cephalica dark reddish-brown; pars thoracica light brown, reticulate; cephalic groove defined, with shallow pit medially; fovea broad, procurved (Fig. 22A); caput elevated (Fig. 22C). Clypeus height: 0.15. Sternum 2.04/1.46, yellow-orange, reticulate; posterior sigillae small oval, other sigillae inconspicuous (Fig. 22B). Labium orange without cuspule. Endites quadrangle; yellow with 12 cuspules; serrula not observed. Chelicerae dark reddish-brown; promargin seven teeth and 28 denticles; rastrellum with nine spines. EYES: AME: 0.12; ALE: 0.20; PLE: 0.1; PME: 0.09; interdistances:AME: 0.11; AME-ALE: 0.09; PME: 0.32; PME-PLE: 0.08; LE: 0.09; ocular quadrangle: 0.75/0.78/0.32. ABDOMEN: Oval, dorsally white with black zigzag median band and two zigzag lateral bands, ventrally dark gray (Fig. 21A, B). Spinnerets: median spinnerets: 0.4; lateral spinnerets: 0.75/0.42/0.41. LEGS: Uniformly yellow-orange. Metatarsi I curved with thin apical scopulae and 18 modified setae (Fig. 22D); metatarsi II without scopulae; tarsi I–II with thin apical scopulae; III–IV without scopulae. Tarsal claw teeth (5/8) (4/7) (7/5) (5/5). LEGS MEASUREMENTS: I 12.79 (3.40/1.70/2.94/2.75/2.00); II 10.61 (3.00/1.59/2.33/2.14/1.55); III 8.21 (2.06/1.13/1.29/2.21/1.52); IV 11.77 (3.31/1.13/2.79/2.73/1.84); leg formula: 1423. LEGS SPINATION: femur I 3d; II 4d; III 2d; IV 2d, with 13 grouped pro-apical spines; patellae I 2v, II, IV (0); III 15p, 2r; tibia I 2-2-1v, 2p and 2 megaspines; II 1-1-1-1v, 2vap; III 2d, 1r, 1p, 2-2v, 3vap; IV 2-2v, 3vap, 3r; metatarsus I 1v, 1vap; II 1-2-1-1-2-1v, 3vap; III 1-1-1-1-3d, 1r, 2-2v, 3vap; IV 1-1d, 1r, 2-2-2v, 3vap; tarsus I (0); II 5r; III 5p, 4r; IV 6p, 3r. GENITALIA: Palp measurements: 1.85/0.82/1.69/0.77; bulb: 0.94 /0.39. Femur longer than tibia; cymbium with seven apical setae (Fig. 23 A, B); bulb wide; embolus tip long and sinuous (Fig. 23C–E).
Female. Unknown.
Distribution. Ecuador, Pichincha and Chimborazo Provinces.
Natural History. The species was collected at two different localities in the Andes, between 2595–2800m. The two males were collected about 180km apart, and the male from Lirios de Carcelen was collected in a dry urban area.
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 28-34, DOI: 10.11646/zootaxa.5317.1.1, http://zenodo.org/record/8153783