Bolostromus stridulator, 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 : 74-75

Bolostromus stridulator new species

Figs 59–61 , map. 2

Type material. Holotype male from Ecuador, Cotopaxi Province, OTONGA Biological Reserve ( -00.41433 - 79.00035) 1888m, 24 May–8 June 2014, pitfall trap, E. Tapia, A. Tapia, C. Tapia, N. Dupérré ( QCAZ) . Paratype: male, same data as holotype ( QCAZ) .

Etymology. The specific name is a non-Latin noun (invariable), in reference to the stridulatory organ found on the chelicerae.

Diagnosis. Males are distinguished from all species by the combination of the following characters: the presence of striduatory keels on the inner side of the chelicerae ( Fig. 60D ); carapace reticulate ( Fig. 60A ) and palp with short embolus with tip strongly bent ( Fig. 61D ).

Description. Male ( holotype): Total length: 2.03; carapace length: 1.12; carapace width: 0.88; carapace height: 0.43; abdomen length: 0.91. CEPHALOTHORAX: Carapace elongated hexagonal, margin sinuous; light yellow-brown; pars cephalica and pars thoracica reticulate; fovea short, slightly procurved, cephalic groove broad and shallow ( Fig. 60A ); caput elevated, ocular quadrangle on a mound ( Fig. 60C ). Clypeus 0.04. Sternum 0.68/0.56, yellow, reticulate; sigillae inconspicuous ( Fig. 60B ). Labium yellow without cuspule. Endites quadrangle, yellow with 1/2 cuspules (right/left side); serrula not observed. Chelicerae light brown; medially with 3–4 reticulated stridulatory keel ( Fig. 60D ); promargin with two double large teeth, four small teeth and six denticles; rastrellum with five spines. EYES: AME: 0.06; ALE: 0.09; PLE: 0.06; PME: 0.04; interdistances: AME: 0.02; AME-ALE: touching; PME: 0.09; PME-PLE touching; LE touching; ocular quadrangle: 0.26/0.26/0.12. ABDOMEN: Oval; light gray witha meshy pattern; ventrally uniformly beige ( Fig. 59A, B ). Spinnerets: median spinnerets: 0.10; lateral spinnerets: 0.20/0.15/0.17. LEGS: Light yellow-brown; metatarsi I–II with thin apical scopulae ( Fig. 60E ); tarsi I–II with complete scopulae ( Fig. 60E ); legs III–IV without scopulae. Coxae I–II without inner short stiff setae. Tarsal claws (2/4) (2/1) (0/0) (0/0). LEGS MEASUREMENTS: leg I 3.37 (1.01/0.45/0.79/0.58/0.54); II 2.88 (0.81/0.42/ 0.66/0.49/0.50); III 2.10 (0.62/0.27/0.34/0.41/0.46); IV 3.32 (0.95/0.45/0.79/0.64/0.49); leg formula: 1423. LEGS SPINATION: femur I (0) II–IV 1d; femur IV with 6 grouped pro-apical spines; patellae I, II, IV (0); III with 5p; tibia I 1-1v; II 1-1v; III 1d, 2vap; IV 1-1v, 2vap; metatarsus I (0); II 1-1v; III 1p, 1-2d, 1vap, 1r; IV 1-1v, 2vap; tarsus I-IV (0). GENITALIA: Palp measurements: 0.49/0.24/0.42/0.25/; bulb: 0.25/0.13. Palp: fermur slightly longer than tibia, palpal tibia wider basally; palpal cymbium with three apical spines ( Fig. 61A, B ); bulb elongated; embolus tip strongly bent ( Fig. 61C–E ).

Female: Unknown.

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

Natural history. The only two males were collected by pitfall at 1888m in a evergreen foothill forest of the Ecuadorian Chocó region .

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 59. Bolostromus stridulator n. sp. Male holotype. A. Habitus, dorsal view. B. Habitus ventral view. Scale bars: 0.5mm.

FIGURE 60. Bolostromus stridulator n. sp. Male holotype. A. Carapace, dorsal view. B. Carapace, ventral view. C. Carapace, lateral view. D. Leg I, prolateral view. E. Chelicerae, frontal view. Scale bars: 0.5mm.

FIGURE 61. Bolostromus stridulator n. sp. Male holotype. A. Palp, prolateral. B. Palp, retrolateral. C. Bulb, prolateral view. D. Bulb, ventral view. E. Bulb, retrolateral view. Scale bars: A, B: 0.5mm; C–E: 0.1mm.