Eutimesius canoabo Villarreal

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), Zoosystematics and Evolution 100 (3), pp. 803-820 : 803-820

Eutimesius canoabo Villarreal & Ahumada-C. sp. nov.

Figs 6 , 7 , 8 , 14 D – F , 2

Type material.

Venezuela • ♂ holotype; Carabobo, El Santuario, Posada Ecológica Casa María, near Canoabo , (10.3132 ° N, 68.2232 ° W); 1,220 m a. s. l.; 19 Mar. 2008; (Villarreal O., Pereira M. P. leg.); on vegetation abbott 1.5–2 m above the ground ( MIZA 0105945 ) . Paratypes • 2 ♀, 1 ♂; same as the holotype; ( MIZA 0105946 ) .

Diagnosis.

It is distinguishable from all other species in the genus by the pattern of dry white spots, occupying lateral zones of the scutal areas II and III, the medial zone of the scutal areas I and II, dispersal spots on the medial zone of the carapace, and part of the lateral margins of the dorsal scutum (Figs 6 A, B , 7 A , 8 A ); and by the ornamentation of the male femur IV, with large tubercles on both complete ventral rows (Fig. 7 G ).

Etymology.

Canoabo is an indigenous word of Arawako origin that means “ village next to fresh water. ” The species name refers to the type locality, a forest near Canoabo, a town and river of the Cordillera de la Costa in Carabobo State, Venezuela.

Description.

Male. Measurements. DSL 3.4; DSW 3.1; AL 1.8; AW 3.1; IOD 1.9; pedipalp: CoPp 0.5, TrPp 0.9, FePp 3.3, PaPp 1.5, TiPp 1.2, TaPp 1.1, ClPp 1.1; total 9.6; leg IV: FeL 7.4, TiL 3.6. Dorsum (Figs 6 A , 7 A , 8 A, C ). DS outline Epsilon type. Anterior margin of DS with two anterolateral tubercles. Anteromedial process of the cheliceral sockets shorter than lateral processes. Eyes separated into two small smooth mounds, placed posteriorly on the carapace. Interocular region with one central elevated mound with small granules that terminates in four short spines. Lateral margins smooth. Mesotergum divided into four areas, III – IV fused: I divided medially into two triangular halves, with one conspicuous tubercle on each side; II entire, with four conspicuous tubercles; III – IV with a lateral pair of large tubercles; one pair of paramedian large spines with granulated base, with two posterior tubercles. Posterior margin and free tergites smooth, with a pair of paramedian acute granules. Venter (Figs 6 B , 7 B ). Coxa I with a cluster of three mesal granules and about 7–8 dispersed granules; II with five intercoxal tubercles, with a median row of eight tubercles and two distal tubercles; III with five-six intercoxal tubercles, 14–15 six tubercles, medially aligned and distally irregularly distributed; IV with seven anterior tubercles and about 18–19 posterior tubercles not aligned. Genital operculum with scattered granules. Stigmatic area with a posterior row of minute granules on the posterior border. Free sternites with a row of small granules. Chelicerae (Figs 6 A, B , 7 A – C ). Segment I smooth with well-defined bulla, with three or four ectoproximal tubercles and one ectodistal tubercle. Segment II swollen, fixed finger with a proximal wide laminar tooth, followed by one medial tooth and one small denticle subdistal; mobile finger with one subproximal large truncated tooth, one medial pyramidal tooth, and two small subdistal teeth. Pedipalps (Fig. 7 D, E ). Coxa with a group of about nine ventral tubercles and three dorsal tubercles. Trochanter with two ventral tubercles and two dorsal tubercles. Femur with a ventroectal row of six-eight small granules and one-two ventromesal granules, and dorsally with a row of minute granules. Patella smooth, distally swollen. Tibia dorsal smooth, ventrally with some proximal minute granules; mesal IIiIi; ectal IIiIii. Tarsus dorsally smooth, ventrally with two rows of minute granules, mesal IiIiIi; ectal iiIiiiIii. Legs (Fig. 7 F, G ). Coxae I – II with two dorsal tubercles; III – IV connected by one intercoxal tubercle; IV with four dorsodistal tubercles and scattered small lateral granules and tubercles. Trochanter I dorsally smooth, ventrally with three tubercles; II with one dorsal and three ventral tubercles; III with one retrolateral and five ventral tubercles; IV with one prolateral and one retrolateral tubercle and seven ventral tubercles. Femora I – II smooth; III with longitudinal rows of tubercles and granules, the ventrodistal larger, and one retrodorsal distal large tubercle; IV with the one proventral and one retroventral rows of tubercles increasing in size distally, and with two dorsoapical tubercles. Patella III dorsally granulated and with a proventral tubercle; IV with one large ventral tubercle; and pro and retrodorsal distal large tubercles and with sparse minute granules. Tibia III slightly increased distally, with two rows of ventral granules in the distal portion; IV with the proventral row of tubercles increasing in size distally; and retrovental row of tubercles, with the distal-most tubercle larger than the others. Basitarsus I slightly swollen. Tarsal process and scopula present. Tarsal claws III and IV opposites and pectinated. Tarsal counts: 7 (2) - 7 (3) / 19 (3) - 18 (3) / 8 / 9-10. Penis (Fig. 14 D – F ). Heterostygninae general pattern, as described in Villarreal et al. (2019 b). Truncus with the malleus swollen. Lamina parva (LP) with a shallow neck and a deep distal cleft. MS - A 1 - A 2 located on the malleus, one pair laterally and one pair more ventrally, with duplication in the more ventral on the left side; MS - B pair ventrally located, distally to the MS - A; two pairs of MS - C located medially on the LP, dorsally to the neck; MS - D 1 located slightly proximal to between MS - E and MS - C; MS - D 2 basally located, near the base of the gland; MS - E with only one pair of short setae visible. Gland globose, with short and dorsally curved stylus with inconspicuous dorsal process. Color (Figs 6 , 8 ). DS mottled on dark yellowish brown (78). Spots on the carapace Brilliant orange (49); tubercles of area I – IV; margins of DS; margins of free tergites; and edge of coxae I – IV; dorsally light olive brown (94). Trochanters I – IV, with the same colors as DS. Femora I – II reticulated dark yellowish brown (78) on a background of light olive brown (94); III – IV with the same colors as DS. Chelicerae reticulated in the same colors as DS.

Female. Measurements. Dorsal scutum length 3.9; dorsal scutum width 3.5; abdominal scutum length 1.9; abdominal scutum width 2.9; interocular distance 1.5; pedipalp: coxa 0.8, trochanter 0.7, femur 2.8, patella 1.2, tibia 1.8, tarsus 1.6, claw 1.3; total 10.2; leg IV: femur 8.0, tibia 3.4. Description (Fig. 6 C, D ). Similar to male, except by abdominal scutum Epsilon type; chelicerae not swollen; interocular projection lower and slightly forward; ornamentation of leg IV conspicuously less developed; basitarsus I not swollen. Chelicerae and legs lighter.

Distribution.

Venezuela, Yaracuy. Only known from the type locality (Fig. 2 ).

Figures

Figure 2. Map showing the distribution of Eutimesius.

Figure 6. Eutimesius canoabo sp. nov., A, B. Male habitus, dorsal and lateral views (MIZA 0105945); C, D. Female habitus, dorsal view (MIZA 0105946). Scale bars: 1 mm.

Figure 7. Eutimesius canoabo sp. nov., male (MIZA 0105945): A. Habitus, dorsal view; B. Ditto, lateral view; C. Right chelicera, frontal view; D. Right pedipalp, tibia, and tarsus, ectal view; E. Ditto, mesal view; F. Right leg IV, dorsal view; G. Ditto, ventral view. Scale bars: 1 mm.

Figure 8. Eutimesius canoabo sp. nov. A – C. From Carabobo State, Venezuela.

Figure 14. Eutimesius spp., penis, distal portion in dorsal, ventral, and lateral view: A – C. E. aroa sp. nov., (MIZA 0105934); D – F. E. canoabo sp. nov., (MIZA 0105945); G – I. E. ephippiatus, (ICN-Ao - 1492); J – L. E. guaichia sp. nov., (MIZA 0105935); M – O. E. simoni, (ICN-Ao - 328). A – I. Unscaled.