Bolostromus riveti Simon, 1903

Dupérré, Nadine, 2023, Review of the American genus Bolostromus Ausserer, 1875 with the description of fourteen new species (Araneae, Cyrtaucheniidae), Zootaxa 5317 (1), pp. 1-88 : 28-34

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 .

Figures

MAP 2. Distribution map of Bolostromus in Ecuador. Bolostromus devriesi n. sp. (green triangle), B. riveti Simon, 1903 (turquoise star), B. hubeni n. sp. (yellow circle), B. urku n. sp. (green half circle), B. epiphyticus n. sp. (red square), B. pristirana n. sp. (pink losange), B. nischki n. sp. (blue inverted triangle), B. fonsecai n. sp. (black cross), B. primus n. sp. (black rectangle), B. losrios n. sp. (red pentagone), B. stridulator n. sp. (blakc circle), B. valdivia n. sp. (yellow square), B. italoi n. sp. (orange circle), B. gaujoni (Simon, 1889) (yellow star).

FIGURE 19. Bolostromus riveti Simon, 1903. Male lectotype. A. Habitus, dorsal view. B. Habitus ventral view. Scale bar: 0.5mm.

FIGURE 20. Bolostromus riveti Simon, 1903. Male lectotype. A. Leg I, retrolateral view. B. Palp, prolateral view. C. Palp, retrolateral view. D. Bulb, prolateral view. E. Bulb, retrolateral view. Scale bar: A= 0.5mm, B–E=0.1mm.

FIGURE 21. Bolostromus riveti Simon, 1903. Male (Quito). A. Habitus, dorsal view. B. Habitus ventral view. Scale bars: 0.5mm.

FIGURE 22. Bolostromus riveti Simon, 1903. Male. A. Carapace, dorsal view. B. Carapace ventral view. C. Carapace, lateral view. D. Leg I, retrolateral view (arrow point to modified setae). Scale bars: 0.5mm.

FIGURE 23. Bolostromus riveti Simon, 1903 A. Palp, prolateral view. B. Palp, retrolateral view. C. Bulb, prolateral view. D. Bulb, retrolateral view. E. Bulb, ventral view. Scale bars: 0.1mm.