Bolostromus fonsecai, 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 : 78-81

Bolostromus fonsecai new species

Figs 62–64 , map. 2

Type material. Holotype male from Ecuador, Napo Province, Bloque 31 Puzo Nashiño (-0.615325 -75.876618) 237.33m, 03.XII.1997, R. Fonseca ( QCAZ).

Etymology. The specific name is in honor of the memory of René M. Fonseca, an Ecuadorian mammologist who collected the type specimen.

Diagnosis. Males resemble B. nischki n. sp. and B. epiphyticus n. sp. but can be distinguished from all species by the combination of the following characters: tibia I with five small spines ( Fig. 63D ), while B. nischki n. sp. tibia I has two spines ( Fig. 45D ), and B. epiphyticus n. sp. has numerous larges spines on tibia I ( Fig. 42D ).

Description. Male (holotype): Total length: 10.08; carapace length: 5.03; carapace width: 3.86; carapace height: 2.46; abdomen length: 5.05. CEPHALOTHORAX: Carapace elongated hexagonal, margin sinuous; pars cephalica dark brown, rugose; pars thoracica lighter brown, smooth; cephalic groove well defined, pit medially; fovea broad, procurved ( Fig. 63A ); caput elevated; ocular quadrangle not on mound ( Fig. 63C ). Clypeus height: 0.3. Sternum 2.81/2.04, dark brown and rugose; posterior sigilla oval, anterior and median sigillae rounded ( Fig. 63B ). Labium short, reddish-brown without cuspule. Endites reddish-brown with 23 small cuspules; serrula not observed. Chelicerae dark reddish-brown; promargin seven teeth and 15 denticles; rastrellum with 12 spines. EYES: AME: 0.26; ALE: 0.36; PLE: 0.2; PME: 0.13; interdistances: AME: 0.11; AME-ALE: 0.1; PME: 0.62; PME-PLE: touching; LE: 0.11; ocular quadrangle: 1.23/1.19/0.57. ABDOMEN: Oval; dorsally light gray, ventrally beige ( Fig. 62A, B ). Spinnerets: median: 0.5; lateral: 0.68/0.63/0.88. LEGS: Legs yellow-brown; metatarsi I–II straight with dense, 1/3 apical scopulae; tarsi I–II with dense, full scopulae ( Fig. 63D ); leg III–IV without scopulae. Coxae II–II without long stiff setae interiorly. Tarsal claw teeth (4-3/6-7) (4/6) (3-3/4-5) (3/4). LEGS MEASUREMENTS: I 16.37 (4.76/2.05/3.75/3.59/2.22); II 13.44 (4.12/1.62/3.15/2.62/1.93); III 10.30 (3.14/1.60/1.64/2.31/1.61); IV 14.98 (4.48/1.56/3.83/3.22/1.89); leg formula: 1423. LEGS SPINATION: (legs missing some spines): femur I–III (0); 11 grouped pro-apical spines; patellae I, II, IV (0); III with 24p, 3d, 2r; tibia I 1-1-2-1v, 1vap, 1r; II 1-1v, 2p; III 4p, 1-1-1-1d, 1v, 2vap, 2r; IV 1-1v, 2vap; metatarsus I (0); II 1-2-1-2, 3vap, 2r, 1p; III 2p, 1- 2-2-1-1-3d; 1-2-1- 2v, 3vap, 1-1-1rap; IV 1d; 1-2-1-1-1v, 4vap, 4p, 2r; tarsus I (0); II 7r; III 4r, 22v; IV 12r, 12p, 23v. GENITALIA: Palp measurements: 3.51/1.51/2.79/0.93; bulb: 0.90/0.45. Palp: femur longer than tibia; tibia straight, two spines prolaterally; cymbium with 10 apical spines ( Fig. 64A, B ); bulb globose; embolus short, slightly sinuous apically ( Fig. 64C–E ).

Female: Unknown.

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

Natural history. The specimen was collected in Amazonian region, bloque 31. Eventhough the label mentions the Napo Province, bloque 31 is a famous petrol region situated in Yasuní Nation Park in Orellana province.

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 42. Bolostromus epiphyticus n. sp. Male allotype. A. Carapace, dorsal view. B. Sternum ventral view. C. Carapace, lateral view. D. Leg I, retrolateral view (arrow point to megaspine). Scale bars: A, B: 1.0mm; C, D: 0.5mm

FIGURE 45. Bolostromus nischki n. sp. Male holotype. A. Carapace, dorsal view. B. Carapace, ventral view. C. Carapace, lateral view (arrow point to cephalic pit). D. Leg I, prolateral view. Scale bars: 1.0mm.

FIGURE 62. Bolostromus fonsecai n. sp. Male holotype. A. Habitus, dorsal view. B. Habitus ventral view. Scale bars: 1.0mm.

FIGURE 63. Bolostromus fonsecai n. sp. Male holotype. A. Carapace, dorsal view. B. Carapace, ventral view. C. Carapace, lateral view. D. Right leg I, retrolateral view. Scale bars: 1.0mm.

FIGURE 64. Bolostromus fonsecai n. sp. Male holotype. A. Palp, prolateral view. B. Palp, retrolaterla view. C. Bulb, prolateral view. D. Bulb, ventral view. E. Bulb, retrolateral view. Scale bars: A, B: 0.5mm; C–E: 0.1mm.