Bolostromus urku, Dupérré, 2023

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 : 66-67

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.

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 48. Bolostromus pristirana n. sp. Male holotype. A. Carapace, dorsal view. B. Carapace, ventral view. C. Carapace, lateral view. D. Leg I, prolateral view (arrow point to megaspine). Scale bars: 0.5mm.

FIGURE 50. Bolostromus urku n. sp. Male holotype. A. Habitus, dorsal view. B. Habitus ventral view. Scale bars: 0.5mm.

FIGURE 51. Bolostromus urku n. sp. Male holotype. A. Carapace, dorsal view. B. Carapace, ventral view. C. Carapace, lateral view. D. Leg I, prolateral view. Scale bars: 0.5mm.

FIGURE 52. Bolostromus urku n. sp. Male holotype. A. Palp, prolateral view. B. Palp, retrolateral view. C. Bulb, prolateral view. D. Bulb, ventral view. E. Bulb, retrolateral view. Scale bars: 0.1mm.