Schismatothele olsoni Guadanucci, Perafán & Valencia-Cuéllar, 2019

Valencia-Cuéllar, Dayana, Perafán, Carlos, Guerrero, Roberto J. & Guadanucci, José Paulo Leite, 2019, Schismatothelinae spiders (Araneae, Mygalomorphae, Theraphosidae) from Colombia: four new species and an approach to their diversity, Zootaxa 4545 (4), pp. 548-562 : 556-557

Schismatothele olsoni Guadanucci, Perafán & Valencia-Cuéllar sp. nov.

( Figs 17–24 )

Type material. COLOMBIA: Holotype male, ICN-AR 8358, Chinácota , Norte de Santander, 1200 masl, 4.X.1998, D. Weinmann leg. VENEZUELA: Paratype male, ICN-Ar8359, from Bramón , Táchira, 1000 masl, 24.IX.2006, D. Weinmann & A. Stirm leg.

Etymology. The specific epithet is a noun in the genitive in honor of the Scandinavian American Christian missionary Bruce Olson, for his respect, love and valuable humanitarian work for Colombian indigenous tribe Motilones, who inhabit the territory where this species is distributed.

Diagnosis. Males of S. olsoni sp. nov. can be distinguished from those of their congeners by the shape of palpal bulb with the embolus pointing upwards ( Figs17–18 ) and the presence of a paraembolic apophysis with rounded tip ( Figs 17–18 ) as well as spines on the retrolateral face of palpal tibia arranged on two groups, 7–8 spines disposed in a row at the apical region, 2 short spines at the medial region ( Figs 22–23 ). Female are unknown.

Description. Holotype Male (ICN-AR 8358). Color (in alcohol): carapace, legs and palps light brown, abdomen black with five transverse clear stripes. Total length: 15.9. Chelicerae basal segment: length 3.8. Carapace subquadrate: length 5.9, width 5.5. Abdomen: length 10.7. Clypeus absent. Eye tubercle slightly elevated, subrectangular: length 1.0, width 1.4. Anterior eye row slightly procurved, posterior recurved. Eyes and interdistances: AME 0.4, ALE 0.42, PME 0.3, PLE 0.34, AME–AME 0.18, AME–ALE 0.1, ALE–ALE 1.0, PME–PME 0.8, PME–PLE 0.04, PLE–PLE 1.14, AME–PME 0.08, ALE–PLE 0.1. Thoracic fovea straight, narrow, deep: width 0.44. Chelicerae basal segment with nine well-developed teeth on furrow promargin, and group of ca. 20 small teeth on proximal area of furrow. Intercheliceral tumescence absent. Maxillae with more than 100 cuspules, located on anterior inner corner. Labium sub-quadrate: length 0.7, width 1.2, with ca. 180 cuspules. Labiosternal junction narrow in middle with two well-developed lateral mounds. Sternum oval: length 2.9, width 2.8; with three pairs of oval sigilla separated by their diameter from edge. Superior tarsal claws without teeth. Tarsal scopulae: I–II entire with few scattered conical setae on longitudinal midline, III–IV divided by longitudinal band of conical setae. Metatarsal scopulae extent: I more than half, II almost its entire length, III–IV on less than half. Clavate tarsal trichobothria in about two rows, each with 10 trichae, interspersed with filiform trichobothria of different sizes. Tarsus IV cracked.

Palpal bulb with piriform tegulum, short embolus pointing upwards, paraembolic apophysis below embolus ( Figs 17–20 ). Cymbium with two asymmetric lobes, retrolateral larger and wider, prolateral lobe elongated and laterally flattened; retrolateral lobe with very small distal retrolateral protrusion/bulge ( Figs22–23 ). Palpal tibia swollen, with short retrolateral spines separated in two groups, one apical row with 7–8 spines, and the other at the tibia mid-length with two spines ( Figs 22–23 ). Tibial spur I ( Fig. 24 ): prolatero-ventral spur with two welldeveloped branches, on same mound; retrolateral branch slightly curved, slender, with small spine inserted subapically, prolateral branch longer than contiguous spine. Metatarsus I bends touching retrolateral branch of tibial spur.

Leg formula 4123. Palpal and leg segments lengths (femur/ patella/ tibia/ metatarsus/ tarsus / total): palp 3.2/ 1.8/ 2.8/ –/ 1.7/ 9.5; leg I 5.5/ 2.9/ 4.5/ 4.1/ 3/ 20; leg II 5 / 2.6/ 3.5/ 3.6/ 2.6/ 17.3; leg III 4.5/ 2.3/ 2.8/ 3.8/ 2.4/ 15.8; leg IV 6.1/ 2.5/ 4.9/ 6/ 2.9/ 22.4.

Spination (proximal to distal): cymbium and tarsi without spines. Palp: femur (d) 0-0-p1, (v) 0, (p) 0, (r) 0; tibia (d) 0, (v) 0, (p) 0, (r) 9 megaspines. Leg I: femur (d) 0-0-p1, (v) 0, (p) 0, (r) 0;tibia (d) 0, (v) 0-1-1, (p) 0-0-1, (r) 0; metatarsus (d) 0, (v) 1-0-2, (p) 0, (r) 0; Leg II: femur (d) 0-0-p1, (v) 0, (p) 0, (r) 0; tibia (d) 0, (v) 1-1-ap3, (p) 0-1-1, (r) 0; metatarsus (d) 0, (v) 1-0-2, (p) 0-1-0, (r) 0; Leg III: femur (d) 0-0-2, (v) 0, (p) 0, (r) 0; patella (d) 0, (v) 0, (p) 1, (r) 0; tibia (d) 0, (v) 2-2-ap3, (p) 1-0-1, (r) 1-0-1; metatarsus (d) 0, (v) 0-1-ap3, (p) 1-1-1, (r) 0-1-1; Leg IV: femur (d) 0-0-2, (v) 0, (p) 0, (r) 0; tibia (d) 0, (v) 1-2-ap3, (p) 1-0-1, (r) 1-0-1; metatarsus (d) 0, (v) 1-2-ap3, (p) 1- 1-1, (r) 0-1-1.

Distribution and natural history. Colombia, Norte de Santander, Chinácota ( Fig. 37 ); and Venezuela, Táchira, Bramón. S. olsoni sp. nov. is found north of the Eastern Cordillera between the border between Colombia and Venezuela, at an altitude of about 1100 masl. It inhabits relatively humid environments with an annual mean temperature about 22°C.

Figures

FIGURES 17–24. Schismatothele olsoni sp. nov., holotype male (ICN-AR 8358). 17–20. Palpal bulb, ventral (17), prolateral (18), retrolateral (19), dorsal (20), views. 21. Carapace. 22–23. Cymbium and palpal tibia, ventro-retrolateral (22), retrolateral (23) views. 24. Leg I, tibial spur, ventro-prolateral view. Blacks arrows show the embolus pointing upwards; grays arrows indicate paraembolic apophysis. Circles show the retrolateral protrusion/bulge on cymbium. Scale bars: Figs 17–20 = 0.5 mm; Figs 21–24 = 1mm.

FIGURES 36–37. Distribution of Schismatothelinae in Colombia. 36. Euthycaelus. 37. Schismatothele and Neoholothele.