Bolostromus italoi, 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 : 46-49

Bolostromus italoi new species

Figs 35–36 , 70, map 2

Type material. Female holotype from Ecuador, Loja Province, Oña (-03. 471850 -79.168543) 2252m, 16.XI.2021, hand collecting in burrow in dry area, I. Tapia ( QCAZ) . Paratypes: 6♀ from Ecuador, same data as holotype ( QCAZ, ZMH-A0019759 , A0019760 MCZ) .

Additional material. ECUADOR: Loja Province: Oña (-03. 471850 -79.168543) 2252m, 16.XI.2021, 1♀ 5juv., hand collecting in burrow in dry area, I. Tapia ( DTC) .

Etymology. The specific name is in honor of Italo Germanico Tapia Caisaguano in recognition of his help and enthusiasm in collecting Ecuadorian spiders including this new species.

Diagnosis. Females most resemble B. valdivia n. sp. in coloration but are differentiated from all species by the combination of the following characters: carapace fovea strongly procurved and, with ending recurved ( Fig. 36A , arrow), metatarsi I with thick, almost complete scopulae, and internal genitalia with elongated and narrow spermathecae with elongated external lobe ( Fig. 36E ).

Description. Female (holotype): Total length: 15.31; carapace length: 6.82; carapace width: 5.52; carapace height: 3.43; abdomen length: 8.49. CEPHALOTHORAX: Carapace almost rectangular sightly medially, margin sinuous; pars cephalica dark brown; pars thoracica light brown, smooth; cephalic groove well defined, with pit medially; fovea broad, strongly procurved with end recurved ( Fig. 36A ); caput strongly elevate ( Fig. 36C ). Clypeus: 0.21. Sternum elongated 3.94/2.79, light beige medially, dark brown laterally; posterior sigillae oval, median and anterior sigillae rounded ( Fig. 36B ). Labium dark reddish-brown without cuspule; elongated. Endites quadrangle; dark reddish-brown with 12 cuspules; serrula not observed. Chelicerae dark brown; promargin seven teeth and 26 denticles; rastrellum with 15 spines. EYES: AME: 0.19; ALE: 0.34; PLE: 0.22; PME: 0.21; interdistances: AME: 0.15; AME-ALE: 0.16; PME: 0.65; PME-PLE: 0.08; LE: 0.13; ocular quadrangle: 1.38/1.47/0.52. ABDOMEN: Oval, dark gray with a median light gray pattern of triangular marks, ventrally light gray ( Fig. 35A, B ). Spinnerets: median spinnerets: 0.67; lateral spinnerets: 1.03/0.74/1.06. LEGS: Uniformly brown; metatarsi I with strong 2/3 scopulae ( Fig. 36D ); metatarsi II with half scopulae; tarsi I–II with complete scopulae ( Fig. 36D ); leg III–IV without scopulae. Coxae I–II with inner short stiff setae ( Fig. 36B , arrow). Tarsal claw teeth (7/6) (6/7) (5/6) (5/4-5). LEG MEASUREMENTS: I 17.17 (5.39/2.88/3.87/2.87/2.16); II 15.23 (4.69/2.36/3.28/2.74/1.81); III 11.28 (3.78/1.97/1.61/2.40/1.52); IV 18.17 (5.12/2.92/4.51/3.79/1.83); leg formula: 4123. LEGS SPINATION: femur I–III (0); IV with 11 grouped pro-apical spines; patellae I, II, IV (0); III with 14p, 2r; tibia I (0); II 1vap; III 2-2v, 2vap, 3p, 1d, 2r; IV 2-2v, 2vap, 3r; metatarsus I 1-1v 3vap; II 1-1-1-1v, 3vap; III 3p, 1-1-2-2d, 2r, 2-2v, 2vap; IV 2r, 2-1-2-2-1-1v, 4vap; tarsus I, II (0); III 3v, 3p; IV 3v, 2r, 3p. GENITALIA: Spermathecae elongated and narrow with elongated external lobes ( Fig. 36E ).

Male: Unknown.

Distribution. Only known from the type locality in Loja Province, Ecuador.

Natural History. Specimens were collected at an altitude of 2252m in a dry forest of the Andes, females build a silk-lined burrow covered by debris ( Fig. 69A, B ).

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 35. Bolostromus italoi n. sp. Female holotype. A. Habitus, dorsal view. B. Habitus ventral view. Scale bars: 1.0mm.

FIGURE 36. Bolostromus italoi n. sp. Female holotype. A. Carapace, dorsal view (arrow point to recuved tip of fovea). B. Sternum, ventral view (arrow point to inner stiff setae on coxa I). C. Carapace, lateral view. D. Leg I, prolateral view. E. Internal genitalia, drosal view. Scale bars: 1.0mm.

FIGURE 69. Bolostromus italoi n. sp. A-B. Females burrows.