Eusarcus uruguayensis (Ringuelet) Hara & Pinto-Da-Rocha, 2010

Hara, Marcos Ryotaro & Pinto-Da-Rocha, Ricardo, 2010, Systematic review and cladistic analysis of the genus Eusarcus Perty 1833 (Arachnida, Opiliones, Gonyleptidae) 2698, Zootaxa 2698, pp. 1-136 : 113-116

Eusarcus uruguayensis (Ringuelet) comb. n., stat. n.

( Figs. 37, 46A,B, 51)

Pygophalangodus gemignanii uruguayensis Ringuelet 1955a: 292 , figs. 2, 3, 295 (diag); 1963: 48 (cat), 49 (key); Capocasale 1966: 632 (cit), 636 (descr fe mistakenly designated as “ allotype ”), fig. 2; 1968: 70 (distr); Maury & Pilati 1996: 1 (cit); Kury 2003a: 189 (cat); (ma holotype & 1 ma paratype, “ Rivera, Rivera, Uruguai; 15.vii.1951; FCE”; examined).

Material examined: URUGUAY. Rivera: Rivera, without name of collector, 15.vii.1951, ma holotype & 1 ma paratype ( FCE). Arapej : Salto, without name of collector, 13.iii.1972, 1 fe (URMU) ; Artigas: Arroyo Cuaró, B.L. de Ximénez leg., ii.1960, 1 ma ( FCE); Sepulturas, C.S. Carbonell leg., 19.xii.1957, 1 fe mistankely designated as “ allotype ” ( FCE); idem (Rio Cuarem, Picada del Negro Muerto ), P. San Martin et al. leg., 2.iii.1969, 1 ma & 1 fe ( MZSP 16056 ); Tres Cruces, without name of collector, 26.xii.1954, 2 fe ( FCE) .

Diagnosis: E. uruguayensis resembles E. caparaoensis + and E. manero +, which have a conical, short, blunt prolateral basal apophysis on the male trochanter IV, and can be distinguished by: The presence of PAM; ocularium high, with 2 large tubercles; without median spine on scutal area III; femur IV with dorso-median enlarged tubercles; prolateral row of enlarged, slightly high tubercles increasing in size to the middle; retrolateral row with a series of high, pointed tubercles in distal third, another with high, blunt tubercles in remaining two third, besides 2 ventro-apical spines.

Redescription: Male (holotype): Dorsum ( Fig. 37A,B): Measurements: SL 3.80; SMW 3.35; femur I 1.70; II 2.70; III 2.10; IV 2.80. Median paracheliceral projection of similar-size as PAM. Anterior margin of prosoma with 1 large tubercle on each corner. Ocularium near to anterior scutal margin; high, with 2 large tubercles and 12 small ones. Carapace with 42 scattered tubercles. Scutal area I with 11–12 scattered tubercles on each side; II with 16; III with 20; median spine absent; IV with 21 tubercles. Posterior margin of dorsal scutum and free tergites I–III with a row of 16, 15, 15, 11 tubercles, respectively. Anal operculum with 27 tubercles.

Venter: Coxa I with 17–18 tubercles, median and distal ones largest; II with 26–28 tubercles, distal ones largest; III–IV irregularly tuberculate.

Chelicera: Segment I smooth.

Pedipalpus: Trochanter dorsally inflated, with 2–3 tubercles. Femur dorsally with 3–4 aligned tubercles; ventrally with 1 large basal tubercle, 2–3 small pointed aligned ones. Tibial setation: Prolateral IiIi/IIi, retrolateral IiIi/iiIi. Tarsal setation: Prolateral IIi, retrolateral IiIi.

Legs ( Fig. 37C–I): Coxa II with 2–3 tubercles on retrolateral margin; IV densely tuberculate, with 1 oblique prolateral apical apophysis, this conical, long, blunt, curved posteriad and ventrad, ventrally swollen in the middle and subapically (less conspicuous). Trochanters I–IV with scattered tubercles; I with 1 large ventro-basal tubercle; III with 1 large retrolateral apical tubercle; IV prolaterally with 1 basal apophysis, this conical, short, blunt, swollen in the middle; retrolaterally with 1 large apical tubercle. Femora I–II with reduced PDS, RDS; ventrally with 2 rows of slightly enlarged tubercles; III sinuous, with reduced PDS, small RDS; ventrally with a prolateral row of tubercles increasing in size distally, 1 PVS; IV sinuous, with enlarged dorso-median tubercles; prolateral row of enlarged, slightly high tubercles increasing in size to the middle; retrolateral row with a series of high, pointed tubercles in distal third, another with high, blunt tubercles in remaining two thirds; medium PDS, small RDS; ventrally with a prolateral row of enlarged tubercles increasing in size in distal third, becoming high, pointed, 2 apical spines. Tibia I ventrally with 2 rows of slightly enlarged tubercles; III ventrally with 2 rows of high, pointed tubercles increasing in size subapically; IV retrolaterally with a row of enlarged tubercles, with 1 apical spine; ventrally with 2 rows of tubercles increasing in size distally, 2 apical spines. Tarsal segmentation: 4–5(2–3), 6, 6, 6.

Penis (MZSP 16056; Fig. 46A,B): Stylus with medio-ventral trichomes, apex fairly thin; with angular medio-ventral projection. Ventral process of glans curved; apex blunt. Ventral plate with concave sides; with 3 pairs of curved distal setae; 1 pair of short, straight median setae; 4 pairs of straight basal setae.

Coloration: Brown; dark brown on apical apophysis of coxa IV, leg IV and most part of metatarsus IV. Light brown in distal third of metatarsus IV, on remaining metatarsi and tarsi.

Female (specimen mistakenly designated as “ allotype ” of P. gemignanii uruguayensis ; FCE): Dorsum: Measurements: SL 3.65; SMW 3.10; femur I 1.60; II 2.60; III 2.00; IV 2.60. Median paracheliceral projection smaller than PAM. Chelicera: Segment I with 3 tubercles. Pedipalpus: Tibial setation: Prolateral and retrolateral IiIi. Legs: Coxa IV with 1 oblique prolateral apical apophysis, this conical, short. Trochanter II with scattered tubercles, 1 large ventro-basal tubercle; IV with scattered tubercles, retrolaterally with 1 large apical tubercle. Femur II with rows of similar-sized tubercles; III ventrally with 2 rows of tubercles increasing in size distally, 1 large prolateral apical tubercle; IV with rows of similar-sized tubercles; ventrally with a prolateral row of tubercles slightly increasing in size distally, 1 large prolateral apical tubercle. Tibiae I, III with rows of similar-sized tubercles; IV with retrolateral row of similar-sized tubercles, ventrally with 2 rows of tubercles slightly increasing in size distally. Tarsal segmentation: 5, 6, 6, 6. Coloration: Brown; dark brown on free tergites and edges of dorsal scutum.

Variation in males (n=3): Measurements: SL 3.80–4.00; SMW 3.35–3.60; femur II 2.60–2.90; III 2.10– 2.15; IV 2.70–2.80.

Variation in females (n=5): Measurements: SL 3.60–4.10; SMW 3.00–3.20; femur I 1.50–1.70; II 2.30– 2.70; III 1.90–2.10; IV 2.40–2.70. Pedipalpus: Tibial setation: Prolateral IiIi/Iiii, retrolateral IiIi/iiIi. Femora I–II with reduced or small PDS; III with reduced or small PDS, RDS.

Type locality: Uruguay, Rivera, Rivera .

Geographical distribution ( Fig. 51): Uruguay.