Bolostromus hubeni, 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 : 34-44

Bolostromus hubeni new species

Figs 24–32 , map 2

Type material. Male holotype from Ecuador, Napo Province, near Papallacta refuge (-0.343426 -78.200065) 3952m, 19–20 May 2108, pan trap in páramo, M. Huben ( QCAZ) . Allotype: ♀, Ecuador, Napo Province, near Papallacta refuge (-0.343426 -78.200065) 3952m, 26–27 May 2018, pan trap in páramo, M. Huben ( QCAZ) . Paratypes: 8J, 2 juv., Ecuador, Napo Province, near Papallacta refuge (-0.343426 -78.200065) 3952m, 26–27 May 2018, pan trap in páramo, M. Huben ( MCZ, QCAZ, ZMH-A0019757 , A0019758) .

Etymology. The specific name is in honor of Mike Huben, an eclectic American personage reborn as an entomologist in Ecuador, for his contribution to the study of the Ecuadorian invertebrate fauna and the collector of the species.

Diagnosis. Males and females are differentiated from all species by their color pattern consisting of a dark abdomen with four pairs of whitish marks and one whitish arrow-shape mark apically ( Figs 24A , 27A ). Furthermore, males are distinguished by their elongated bulb; short embolus smoothly curved apically ( Fig. 26C–E ); females are distinguished by their internal genitalia with one elongated spermathecae with one small rounded external lobe ( Fig. 29A ).

Description. Male (holotype): Total length: 9.34; carapace length: 4.35; carapace width: 3.58; carapace height: 1.46; abdomen length: 4.99. CEPHALOTHORAX: Carapace elongated hexagonal; dark reddish-brown; pars cephalica smooth; pars thoracia smooth; cephalic groove deep, with pit medially ( Fig. 25C , arrow); fovea broad, procurved ( Fig. 25A ); caput not strongly elevate ( Fig. 25C ). Clypeus: 0.25. Sternum elongated 2.38/ 1.87, orange with dark reddish-brown triangular mark medio-basally; reticulated, posterior and median sigillae oval and anterior rounded ( Fig. 25B ). Labium dark orange-brown; without cuspule. Endites quadrangle; orange-brown with six cuspules; serrula not observed. Chelicerae dark reddish-brown; promargin seven teeth and 16 denticles; rastrellum with 21 spines. EYES: AME: 0.15; ALE: 0.26; PLE: 0.18; PME: 0.12; interdistances: AME: 0.11; ALE-ALE: 0.08; PME: 0.35; PME-PLE: 0.07; LE: 0.08; ocular quadrangle: 0.84/0.93/0.42. ABDOMEN: oval; dorsally dark gray with four pairs of whitish marks and one arrow-shaped withish mark apically; ventrally uniformly dark gray ( Fig. 24A, B ). Spinnerets: median spinnerets: 0.40; lateral spinnerets: 0.67/0.40/0.69. LEGS: Uniformly orange-brown; metatarsi I straight, with thick apical 1/3 scopulae ( Fig. 25D ); tarsi I–II with complete scopulae ( Fig. 25D ); metatarsi II with thick apical 1/3 scopulae; leg III–IV without scopulae. Coxae I–II without inner short stiff setae. Tarsal claw teeth (6/5) (4-5/6) (4/5) (3–5/5). LEGS MEASUREMENTS: I 13.08 (3.71/1.86/3.07/2.58/1.86); II 11.12 (2.90/1.52/2.62/2.33/1.75); III 8.46 (2.43/1.16/1.51/1.90/1.46); IV 12.35 (3.41/1.52/2.96/2.75/1.71); leg formula: 1423. LEGS SPINATION: femur I (0); II 1-1d; III 1-1-1d; IV 1d with 18 grouped pro-apical spines; patellae I, II, IV (0); III with 16p, 2r; tibia I, 3p; 1-1-1-1-1-1; 3r; II 1-1-1v; 2vap; III 1p, 2pap; 1d, 2v, 2vap;1r, 1rap; IV 2-2- 2vap; 1r; metatarsus I 1v 1vap; II 1-1; 2vap; III 1p, 1-2-3d;1r, 2-2, 3vap; IV 1-1r, 2-1-1-2v, 3vap; tarsus I, II (0); III 2p, 1-1-2v; IV 2p; 1-1-1-1-1v; 5r. GENITALIA: Palp measurements length: 2.31/1.13/1.90/0.84; bulb: 0.82/0.32 wide. Palpal tibia with diffuse black band dorsally, slender; cymbium with nine spines apically ( Fig. 26A, B ); bulb elongated; embolus short, smoothly bent apically ( Fig. 26C–E ).

Female (allotype): Total length: 9.68; carapace length: 4.01; carapace width: 3.46; carapace height: 2.02; abdomen length: 5.67. CEPHALOTHORAX: Carapace elongated rectangular, wider anteriorly; light reddish-brown; pars cephalica smooth; pars thoracia smooth; cephalic groove deep, pit-like medially ( Fig. 28C , arrow); caput slightly elevated ( Fig. 28C ); fovea broad, procurved ( Fig. 28A ). Clypeus height: 0.3. Sternum elongated 2.40/2.05, orange with dark reddish-brown triangular mark medio-basally, reticulated; sigillae inconspicuous ( Fig. 28B ). Labium orange-brown; without cuspules. Endites quadrangle; orange-brown with 10 cuspules; serrula not observed. Chelicerae dark reddish-brown; promargin with seven teeth and nine denticles; rastrellum with ~23 spines. EYES: AME: 0.12; ALE: 0.28; PLE: 0.18; PME: 0.12; interdistances: AME: 0.12; AME-ALE: 0.15; PME: 0.42; PME-PLE: 0.08; LE: 0.12; ocular quadrangle: 0.85/0.92/0.45. ABDOMEN: as in male ( Fig. 27A, B ). Spinnerets: median spinnerets: 0.55; lateral spinnerets: 0.70/0.45/0.72. LEGS: coloration as in male. Metatarsi I with thin half scopulae ( Fig. 28D ); metatarsi II with inconspicuous apical scopulae; tarsi I–II with complete scopulae ( Fig. 28D ); legs III, IV without scopulae; palp with almost complete scopulae. Coxae I–II without inner short stiff setae. Tarsal claw teeth (4-5/5) (4/6) (2-3/3-4) (3/5). LEGS MEASUREMENTS: I 8.42 (2.62/1.43/1.88/1.44/1.05); II 9.67 (2.97 /1.63/2.22/1.54/1.31); III 6.38 (2.02/1.33/0.99/1.12/0.92); IV 10.20 (3.30/1.31/2.47/1.81/1.31); leg formula: 4123. LEGS SPINATION: femur I–III (0); IV with 16 grouped pro-apical spines; patellae I, II, IV (0); III with 18p, 2r; tibia I (0); II 1v; III 3p, 1d, 2r, 2vap; IV 1-2v, 2vap; metatarsus I 1-1v, 1vap; II 1-1v, 3vap; III 2p, 1-2-2-3d, 1r, 1-2v, 2vap; IV 2r, 1-2-1v, 2vap; tarsus I, II (0); III 6p, 1r; 7p; IV 5r. GENITALIA: Spemathecae elongated with one, apical globose external lobes ( Fig. 29A ).

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

Natural history. Specimens were collected by pitfalls trap in the Andean Páramo at 3952m.

Note. Juvenile specimen presents the same coloration as adult ( Fig. 29B ).

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 24. Bolostromus hubeni n. sp. Male holotype. A. Habitus, dorsal view. B. Habitus ventral view. Scale bars: 1.0mm.

FIGURE 25. Bolostromus hubeni n. sp. Male holotype. A. Carapace, dorsal view. B. Carapace, ventral view. C. Carapace, lateral view (arrow point to cephalic pit). D. Leg I, retrolateral view. Scale bars: 1.0mm.

FIGURE 26. Bolostromus hubeni n. sp. Male holotype. A. Palp, retrolateral view. B. Palp, prolateral view. C. Bulb, prolateral view. D. Bulb, retrolateral view. E. Bulb, ventral view. Scale bars: A, B:0.5mm; C–E: 0.1mm.

FIGURE 27. Bolostromus hubeni n. sp. Female allotype. A. Habitus, dorsal view. B. Habitus ventral view. Scale bars: 1.0mm.

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 30. Bolostromus hubeni n. sp. Male. SEM. A. Rastrellum. B. Chelicerae, anterior view. C. Cheliceral teeth and denticles. D. Endites, dorsal view (arrow point to serrula). E. Serrula. F. Endites, basal spines.

FIGURE 31. Bolostromus hubeni n. sp. Male SEM. A. Abdomen, ventral view. B. Sperm pore, ventral view. C. Trasal claw teeth III. D. Tarsal claw IV. E. Cymbium, apical view. F. Tarsus, dorsal view.

FIGURE 32. Bolostromus hubeni n. sp. Male SEM. A. Palp, prolateral view. B. Palp, retrolaterlal view. C. Bulb, ventral view. D. Bulb, retrolateral view.