Bolostromus primus, 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 : 67-70

Bolostromus primus new species

Figs 53–55 , map 2

Type material. Holotype male from Ecuador, Los Ríos Province, Centro Cientifico Rio Palenque (00°54’S 79°00’W) 14 Sept. 1979, T. Devries ( QCAZ) . Paratypes: from Ecuador, Los Ríos Province, 1J, Centro Cientifico Rio Palenque (00°54’S 79°00’W), II .1980, bosque primario, Sandoval ( QCAZ); 1J, 29 Dec. 1980, bosque primario, colleción MAB, UNESCO , S. Sandoval ( QCAZ); 1J, CC Rio Palenque (00°54’S 79°00’W) 220m, 2 Feb. 1977, bosque primario, T . Devries ( QCAZ); 1J, CC Rio Palenque (00°54’S 79°00’W) 220m, 27 Feb. 1977, bosque primario, T . Devries ( QCAZ) .

Etymology. The specific name is a Latin adjective, meaning primary seeing that the species was collected in a primary forest.

Diagnosis. Male most resemble B. losrios n. sp. but are distinguished from all species by the combination of the following characters: carapace rugose, sternum strongly reticulate ( Fig. 54A, B ) and embolus with sinuous tip ( Fig. 55D ).

Description. Male (holotype): Total length: 3.86; carapace length: 1.92; carapace width: 1.46; carapace height: 0.77; abdomen length: 1.76. CEPHALOTHORAX: Carapace hexagonal, wider medially, margin sinuous; pars cephalica dark reddish-orange, rugose; pars thoracica reddish-orange, rugose; cephalic groove well defined, with pit medially; fovea broad, slightly procurved ( Fig. 54A ); caput slightly elevated ( Fig. 54C ). Clypeus height: 0.05. Sternum elongated 1.08/0.89, reddish-orange, reticulated; posterior sigilla oval, median and anterior sigillae inconspicuous ( Fig. 54B ). Labium dark reddish-orange without cuspule. Endites quadrangle; dark reddish-orange without cuspules; serrula not observed. Chelicerae dark reddish; promargin three teeth, denticles not observed; rastrellum with five spines. EYES: AME: 0.12; ALE: 0.13; PME: 0.01; PLE: 0.10; interdistances: AME: 0.03; AME-ALE: 0.08; PME: 0.31; PME-PLE: touching; LE: 0.02; ocular quadrangle: 0.49/0.49/0.20. ABDOMEN: Oval, dorsally dark gray, ventrally light gray ( Fig. 53A, B ). Spinnerets: median: 0.12; lateral spinnerets: 0.24/0.14/0.20. LEGS: Light orange-brown except for femur I–II darker reddish-orange. Coxae I–II without inner short stiff setae. Metatarsi I with short, apical scopulae ( Fig. 54D ); metatarsi II without scopula, tarsi I–II with thick complete scopulae ( Fig. 54D ); III–IV no scopulae. Tarsal claw teeth (1/5) (2/7) (1/0) (1/3). LEGS MEASUREMENTS: I 5.15 (1.50/0.58/1.32/0.97/0.78); II 4.60 (1.37/0.55/1.19/0.79/0.70); III 3.28 (0.99/0.36/0.54/0.78/0.61); IV 5.16 (1.48/0.6 2/1.26/1.10/0.70); leg formula: 4123. LEGS SPINATION: femur I–III (0) IV 2d, with 11 grouped pro-apical spines; patellae I, II, IV (0); III 10p, 2r; tibia I 3v, II 1p, 1-1-1v, 2vap; III 1d, 2p, 1v, 2vap; IV 2vap; metatarsus I 1v, 1vap; II 1-1v, 2vap; III 1-1v, 2vap, 2r, 1-1-1-2d, 1p; IV 1-1v, 2vap; tarsus I-IV (0). GENITALIA: Palp measurements: 0.88/0.41/0.68/0.38; bulb 0.35/0.20. Palpal tibia wider basally; cymbium with four spines apically ( Fig. 55A, B ); bulb globose; embolus short, apex sinuous ( Fig. 55C–E ).

Female: Unknown.

Distribution. Only found at the type locality in Los Ríos Province, Ecuador.

Natural history. Specimens were collected in a primary lowland tropical 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 53. Bolostromus primus n. sp. Male holotype. A. Habitus, dorsal view. B. Habitus ventral view. Scale bar: 0.5mm

FIGURE 54. Bolostromus primus 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 55. Bolostromus primus n. sp. Male holotype. A. Palp, prolateral view. B. Palp, retrolateral view. C. Bulb, prolateral view. D. Bulb, apical view. C. Bulb, retrolateral view. Scale bars: 0.1mm.