Eutimesius ephippiatus
Creators: name: Villarreal, Osvaldo
name: Ahumada-C., Daniela
name: Navas-S., Gabriel R.
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Opiliones
Stygnidae
Eutimesius
Eutimesius ephippiatus

description: Eutimesius ephippiatus (Roewer, 1915)
Figs 9, 10, 14 G – I, 2
Dichobunistygnus ephippiatus Roewer C-F, (1915): 105, figs 57 a – b.
Eutimesius ephippiatus: Pinto-da-Rocha (1997): 187, figs 54–56.
Material examined.
Colombia • 1 ♂, 1 ♀; Boyacá (New department record), Santa María, sendero Hyca Quye, 5.5 km NW from Santa María, forest edge roadside; (4.89811 ° N, 73.29344 ° W); Ago. 2016; (Rodríguez, C. leg.) (MPUJ _ ENT 004 8876). • 1 ♂, Boyacá, Santa María, Quebrada La Argentina, forest edge, 0.5 km SSW from Santa María; (4.85673 ° N, 73.26375 ° W); manual capture; 850 m a. s. l.; Ago-Sep. 2015; (Guzmán, K. leg.) (MPUJ _ ENT 0039466). • 1 ♀; Casanare (new department record), Agua Azul; [5.1866 ° N, 72.5558 ° W]; 14 Oct. 1978; (La Rotta, C. leg.) (ICN-Ao - 18). • 1 ♀; Cundinamarca, Ubalá, Ubalá B., Inspección San Pedro de Jágua, left bank of the Rio Zaquea; [4.7133 ° N, 73.3016 ° W]; 500 m a. s. l.; manual capture; Apr. 1998; (Rodríguez, V., Sierra, S., Flórez, E., Varón, A. leg.) (ICN-Ao - 1491). • 1 ♂; Cundinamarca, Ubalá, Ubalá B., Inspección Mambita, Vda. Boca de Monte, surroundings Boca de Monte school; (4.7430 ° N, 73.3016 ° W); 1,000 m a. s. l.; manual capture; Apr. 1998; (Rodríguez, V., Sierra, S., Flórez, E., Varón, A. leg.) (ICN-Ao - 1492). • 1 ♀; Cundinamarca, Ubalá, Ubalá B., Inspección San Pedro de Jágua, Vda. Soya, left bank of the Rio Zaquea; (4.7133 ° N, 73.3392 ° W); 500 m a. s. l.; manual capture; Apr. 1998; (Rodríguez, V., Sierra, S., Flórez, E., Varón, A. leg.) (ICN-Ao - 1511).
Diagnosis.
It is distinguishable from all other species in the genus by the pattern of dry white spots that encircled completely the eyes (Figs 9, 10 A, B), and the proximal half of femora and tibiae IV without tubercles or with only minute granules (Figs 10 F, G).
Complementary description.
Male. Measurements. DSL: 1.4; DSW: 2.8; AL: 1.7; AW: 3.0; IOD: 1.6; pedipalp: CoPp 0.7, TrPp 0.7, FePp 2.9, PaPp 1.3, TiPp 1.5, TaPp 1.3, ClPp 0.8; total 9.2; Leg IV: FeL 7.6, TiL 2.6. Dorsum (Figs 9 A, C, 10 A, B). DS outline Epsilon type. Anterior margin of DS with four anterolateral large tubercles. Anteromedial and lateral process of the cheliceral sockets short. Eyes separated into two small smooth mounds, placed slightly posteriorly on the carapace. Interocular region with small granules and one central elevated and irregular mound that terminates in two short tubercles. Lateral margins with a row of seven tubercles. Mesotergum divided into four areas, III – IV mostly fused: I divided medially into two oval halves, with one conspicuous tubercle on each side and some lateral granules; two entire, with seven-eight conspicuous tubercles; III / IV with one pair of paramedian very large spines projected backward (three times the length of the interocular eminence); and granulated, posterior region with a row of small granules. Posterior margin smooth, free tergites with a row of small granules. Anal operculum and sternites with small granules. Venter (Figs 9 C, 10 B). Coxa I with three distal tubercles and a medial row of five tubercles; II with three distal tubercles, a median row of nine tubercles, and a posterior row of three-five small tubercles; III with three distal tubercles, three-five anterior, eight medial, and five posterior tubercles; IV with four intercoxal tubercles, one median row with eight tubercles aligned, some scattered anterior tubercles, and about eight-ten posterior tubercles aligned. Genital operculum and stigmatic area with scattered granules. Free sternites with a row of small granules. Chelicerae (Figs 9 A, C, 10 A – C). Segment I smooth with well-defined bulla with tiny granules. Segment II swollen. Fixed finger with one medial tooth, mobile finger with one sub-proximal large tooth, one medial large tooth and two small subdistal teeth. Pedipalps (Figs 9 A, 10 A, D, F). Coxa with some granules. Trochanter with three dorsodistal tubercles and one dorsal tubercle in the medial position, ventrally with some minute granules. Femur and patella dorsally and ventrally, with some scattered granules. Patella distally swollen. Tibia dorsal with some minute granules, ventrally with a row of minute granules, mesal IIII, ectal IIiIiI. Tarsus dorsally and ventrally smooth; mesal IiIiIi, ectal IiiIiii. Legs (Figs 9 A, C, 10 A, B, F, G). Coxae I – III unarmed, IV with one large prodorsal tubercle in medial position. Trochanter II with one dorsodistal tubercle, III – IV ventrally granulated, III with one row of 4–5 dorsodistal tubercles and one row of four proventral tubercles, IV with 4–5 prodorsal tubercles (the two distalmost larger), one large retrodorsal sub-distal tubercle, and a group of small prodorsal proximal tubercles. Femora I – II with longitudinal rows of granules dorsally and ventrally, III with one prodorsal distal conical tubercle and ventral row of conical tubercles increasing in size distally, IV with one prolateral and one retrolateral row of small tubercles, dorsally with two distal conical tubercles, and ventrally with two longitudinal rows of conical tubercles increasing in size distally. Patellae III – IV granulated, IV dorsally tuberculated, with one retrodorsal distal conical tubercle, one retroventral row of tubercles (the distalmost larger), two conical ventral tubercles in medial portion (the distalmost larger), and one proventral conical tubercle in distal portion. Tibia III with some granules, IV with one large retrodorsal distal tubercle and some scattered granules and small tubercles, two ventral rows of tubercles. Tarsal claws III and IV opposites and pectinated. Tarsal counts: 7 (3) - 7 (3) / 17-19 / 9-10 / 9 - 9. Penis (Fig. 14 G – I). Heterostygninae general pattern. Malleus swollen. LP with a shallow neck and a deep distal cleft. MS - A located on the malleus, two pair dorsally and one pair more ventrally; MS - B pair located ventrally; MS - C pair located medially on the LP, distally to the neck; MS - D 1 large, located sligthly proximal to MS - E; MS - D 2 located basally, near the base of the glans; MS - E apparently with only one pair of setae visible. Glans globose, with short and dorsally curved stylus with small dorsal process. Color (Fig. 9 A, C). DS, and free tergites Dark orange yellow (72). Spots on carapace and mesotergum Vivid orange yellow (66). Pair of paramedian spines in area III Brownish black (65). Free sternites Dark yellowish brown (78). Chelicerae reticulated and pedipalps Light greenish yellow (101). Coxae I – IV and trochanters I – IV brilliant yellow (83), Femora I – II reticulated light greenish yellow (101), and III and VI brilliant yellow (83).
Female. Measurements. DSL: 1.2–1.5; DSW: 2.5–3.2; AL: 1.5–2.2; AW: 2.9–3.5; IOD: 1.3–1.7; pedipalp: CoPp 0.4–0.8, TrPp 0.5–0.6, FePp 1.9–2.6, PaPp 1.0–1.4, TiPp 0.8–1.4, TaPp 0.8–1.3, ClPp 0.7–0 - 9, total 4.3–8.0; Leg IV: FeL 6.2–8.2, TiL 3.4–4.1. Description of female (Fig. 9 B). Similar to male, except by abdominal scutum wider posteriorly; spots on area II, anterior and lateral margins; chelicerae not swollen; ornamentation of leg IV conspicuously less developed; basitarsus I not swollen. Chelicerae dark yellow (88), pedipalps, trochanters I – III, and femora I – III strong yellow (84), Trochanter IV strong yellowish brown (74), and femur IV strong yellow (84).
Distribution.
Colombia, Casanare, Cundinamarca, Quindio (Fig. 2).
description: Published as part of Villarreal, Osvaldo, Ahumada-C., Daniela & Navas-S., Gabriel R., 2024, Exploring the diversity of Eutimesius Roewer, 1913: new species and records from Colombia and Venezuela (Opiliones, Gonyleptoidea, Stygnidae), pp. 803-820 in Zoosystematics and Evolution 100 (3) on pages 803-820, DOI: 10.3897/zse.100.120207