Bolostromus valdivia, 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 : 84-87

Bolostromus valdivia new species

Figs 67 , 68 , map. 2

Type material. Holotype from Ecuador, Manabí Province, Sancan 4km via Puerta al Cielo (-1.273246 -80.605045) 307m, 10.x.2021, hand collected under dead wood an rocks in dry area, E. Tapia, N. Dupérré, A. Tapia, ECFN 8037 ( QCAZ).

Etymology. The specific name is from the Valdivia culture, one of the oldest settled cultures recorded in the Americas found in the region where the species was collected.

Diagnosis. Females resemble B. hubeni n. sp. in coloration but are distinguished from all species by the combination of the following characters: carapace and abdomen with strong coloration pattern ( Fig. 67A, B ) and internal genitalia with straight elongated spermathecae with small rounded lobes ( Fig. 68B ), while B. hubeni n. sp. carapace without a pattern ( Fig. 28A ) and internal genitalia curved ( Fig. 29A ).

Description. Female (holotype): Total length: 12.49; carapace length: 5.51; carapace width: 4.46; carapace height: 3.19; abdomen length: 6.98. CEPHALOTHORAX: Carapace almost rectangular but wider anteriorly, margin sinuous; pars cephalica dark reddish-black, medially with two reddish bands, smooth; pars thoracica light brown smooth; cephalic groove shallow, without pit; fovea broad, procurved ( Fig. 67B ); caput strongly elevate ( Fig. 68A ). Clypeus height: 0.17. Sternum elongated 3.17/2.34; dark brown laterally, lighter brown medially and basally, reticulate; all sigillae oval, orange-brown ( Fig. 67C ). Labium dark reddish-brown without cuspule. Endites quadrangle, dark reddish-brown with 16 cuspules; serrula not observed. Chelicerae dark reddish-brown; promargin seven teeth and 28 denticles; rastrellum with 14 spines. EYES: AME: 0.17; ALE: 0.28; PME: 0.13; PLE: 0.20; interdistances:AME:0.15;AME-ALE:0.13; PME:0.52; PME-PLE:0.06; LE:0.09; ocular quadrangle:1.04/1.12/0.5. ABDOMEN: Oval, dorsally dark with five double, triangular beige patches and one central, triangular beige patch posteriorly, ventrally light gray ( Fig. 67A ). Spinnerets: median: 0.86; lateral: 1.15/0.79/1.09. LEGS: Light brown, tarsi darker. Coxae I–II with inner short stiff setae ( Fig. 67C ). Metatarsi II without scopulae; tarsi II with scopulae; III–IV without scopulae; palp missing. Tarsal claw teeth (4/5) (3/3) (3/4). LEGS MEASUREMENTS: I missing; II 10.93 (3.60/1.64/2.67/2.01/1.01); III 8.11 (2.67/1.44/1.35/1.60/1.05); IV 13.73 (4.27/1.62/3.61/2.91/1.32). Leg formula: -423. LEGS SPINATION: femur II 1d, III (0); IV with 17 grouped pro-apical spines; patellae I, II, IV (0); III with 9pd, 2r; tibia; II 1-1v, 1vap; III 3p, 1d, 2r, 2-1v, 3vap IV 2r, 2-2-2v; metatarsus II 2-3v, 2vap; III 2p, 1-1-2-3d, 1r, 2-2v, 3vap; IV 2r, 1-1-2-2-1v, 3vap; tarsus II 1v; III 3p, 2r, 2-2-1v; IV 8p, 3r, 2-2-2-2v. GENITALIA: Spermathecae elongated, straight with small rounded lobes sub-apically ( Fig. 68B ).

Male: Unknown.

Distribution. Only found at the type locality in Manabí province, Ecuador.

Natural History. The only specimen was collected in a dry coastal forest at 307m.

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 28. Bolostromus hubeni n. sp. Female allotype. Carapace, dorsal view. B. Carapace, ventral view. C. Carapace, lateral view (arrow point to cephalic pit). D. Leg I, prolateral view. Scale bars: 0.5mm.

FIGURE 29. Bolostromus hubeni n. sp. Female allotype. A. Internal genitalia, dorsal view. B. Female juvenile paratype, habitus dorsal view. Scale bar: 0.5mm.

FIGURE 67. Bolostromus valdivia n. sp. Female holotype. A. Habitus, dorsal view. B. Carapace, dorsal view. C. Sternum, ventral view. Scale bars: 1.0mm.

FIGURE 68. Bolostromus valdivia n. sp. A. Carapace, lateral view. B. Internal genitalia, dorsal view. Scale bars: 1.0mm.