Euthycaelus guane Valencia-Cuellar, Perafán & Guadanucci, 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 : 552

Euthycaelus guane Valencia-Cuellar, Perafán & Guadanucci sp. nov.

( Figs 1–8 )

Type material. COLOMBIA: Holotype male, ICN-Ar 8045, San José de Suaita (forest of the San Cipriano Foundation), Suaita , Santander, 1700 masl, 1.V.2013, C. Romero and G. Amat leg.

Etymology. The specific epithet is a noun in apposition in honor of the indigenous people Guane, who inhabited the territory where this species is found.

Diagnosis. Males of E. guane sp. nov. differ from those of other species by the shape of the palpal bulb, with a distinct elongated and acuminated embolus tip ( Figs 1–4 ), two ventral small keels and a small dorsal translucent keel ( Figs 2–3 ); thick spines on the retrolateral face of the palpal tibia arranged on two aligned rows, close to each other, with a proximal gap between them ( Fig. 7 ). Females are unknown.

Description. Holotype male (ICN-Ar 8045). Color (in alcohol): carapace and femora dark brown, legs brown, abdomen light brown; carapace bordered by numerous golden setae, abdomen and legs covered by golden setae. Total length: 16.6. Chelicerae basal segment: length 2.6. Carapace elongated: length 8.5, width 7.1. Abdomen: length 7.3. Clypeus absent. Eye tubercle slightly elevated, sub-rectangular: length 1.1, width 1.7. Anterior eye row slightly procurved, posterior slightly recurved. Eyes and interdistances: AME 0.48, ALE 0.43, PME 0.24, PLE 0.34, AME–AME 0.14, AME–ALE 0.10, ALE–ALE 1.11, PME–PME 0.77, PME–PLE 0.05, PLE–PLE 1.21, AME–PME 0.07, ALE–PLE 0.10. Thoracic fovea procurved, narrow, deep: width 1.1. Chelicerae basal segment with 10 well-developed teeth on furrow promargin, and group of 14 small teeth on proximal area of each furrow. Intercheliceral tumescence absent. Maxillae with about 200 cuspules, located at anterior inner corner. Labium subrectangular: length 0.6, width 1.5, with about 300 cuspules. Labio-sternal junction narrow in middle with two lateral mounds. Sternum rounded: length 3.6; width 3.5; with three pairs of oval sigilla heavily sclerotized, proximal pairs separated by their diameter from edge, distal pair separated by little more than their diameter. Superior tarsal claws with row of small teeth. Tarsal scopulae: I and II entire, III and IV divided by longitudinal band of conical setae. Metatarsal scopulae extent: I and II on distal 3/4, III on distal half, IV on less than half. Clavate tarsal trichobothria in about two rows, each with ca.14 trichae, interspersed with filiform trichobothria of different sizes. Tarsus IV slightly cracked.

Palpal bulb with short embolus with distinct elongated and acuminated tip, two ventral small keels and a small dorsal translucent keel ( Figs 1–4 ). Cymbium with two asymmetric lobes ( Fig. 6 ), retrolateral larger and wider; prolateral lobe elongated and laterally flattened; retrolateral lobe with proximal retrolateral edge heavily sclerotized ( Fig. 7 ). Palpal tibia wide, roughly equal for its length, with eight thick retrolateral spines arranged on two aligned rows, close to each other, with proximal gap between each ( Fig. 7 ). Tibia I spur ( Fig. 8 ): prolateroventral spur with two well-developed branches, not on same mound; retrolateral branch slender, tapering and slightly curved, almost twice as large as prolateral branch, with internal spine at mid-length; prolateral branch slender, shorter, with acontiguous spine. Metatarsus I bends touching retrolateral branch of tibial spur.

Legs formula 4123. Palpal and legs segments lengths (femur/ patella/ tibia/ metatarsus/ tarsus/ total): palp: 4.3/ 2.6/ 3.5/ –/ 2.1/ 12.5; leg I: 7.6/ 4.1/ 5.9/ 6.1/ 4.1/ 27.8; leg II: 6.7/ 3.8/ 4.9/ 5.3/ 3.6/ 24.3; leg III: 5.9/ 5.3/ 3.8/ 5.6/ 3.4/ 24.0; leg IV: 8.1/ 3.5/ 6.7/ 9.2/ 4.0/ 31.5.

Spination (proximal to distal): cymbium and pedal tarsi without spines. Palp: femur 0; patella 0; tibia (d) 0, (v) 0, (p) 0-0-1, ap2, (r) 8 thick spines. Leg I: femur (d) 0, (v) 0, (p) 0-0-d1, (r) 0; patella 0; tibia (d) 0, (v) 0, (p) 0-0-1, (r) 0; metatarsus (d) 0, (v) 0-1-ap3, (p) 0, (r) 0. Leg II: femur (d) 0, (v) 0, (p) 0-0-d1, (r) 0; patella 0; tibia (d) 0, (v) 1-2-ap3, (p) 0-d2-0, (r) 0; metatarsus (d) 0, (v) 0-2-ap3, (p) 0, (r) 0. Leg III: femur (d) 0, (v) 0, (p) 0-0-d1, (r) 0-0- d2; patella (d) 0, (v) 0, (p) 0-0-1, (r) 0; tibia (d) 0, (v) 2-1-d3, (p) 0-d2, v1 -0, (r) 0-d1-d1; metatarsus (d) 0, (v) 0-2- ap1, (p) d1-d1-d1,ap1, (r) 0-d1-d1. Leg IV: femur (d) 0, (v) 0, (p) 0-0-d1, (r) 0-0-d2; patella 0; tibia (d) 0, (v) 2-2- ap3, (p)1-2-2, (r) 1-d1,2-d1,1; metatarsus (d) 0, (v) 1-3-1,ap3 (p) d1-d1-d1 (r) 0-d2-d1.

Distribution and natural history. Known only from its type locality, from forest of the San Cipriano Foundation, San José de Suaita, Santander, Colombia. This Andean forest is located between 1700 and 2050 masl on the Eastern Cordillera ( Fig. 36 ), with an mean temperature of 19 °C and an mean annual precipitation about 2400 mm; according to the Holdridge’s classification system it corresponds to a "very humid premontane forest" ( Espinal 1977).

Figures

FIGURES 1–8. Euthycaelus guane sp. nov., holotype male (ICN-Ar 8045). 1–4. Palpal bulb: ventral (1), prolateral (2), retrolateral (3), dorsal (4) views. 5. Carapace, dorsal view. 6. Cymbium, ventral view. 7. Palpal tibia, retrolateral view. 8. Leg I, tibial spur, ventro-prolateral view. Black arrows indicate ventral keels; grays arrows dorsal keel. Scales bars = 1mm.

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