Eusarcus fulvus Soares & Soares

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 : 56-58

Eusarcus fulvus Soares & Soares

( Figs. 14, 40A,B, 51)

Eusarcus fulvus Soares & Soares 1946a: 199 , fig. 3; Soares & Soares 1954b: 260 (cat).; Kury 2003a: 169 (cat) (ma holotype; “Santa Thereza, Espírito Santo; Schubart leg.; 29.x.1944; MZSP 28659”; examined).

Material examined: BRAZIL. Espírito Santo: Santa Teresa, O. Schubart leg., 29.x.1944, ma holotype ( MZSP 28659 ) .

Diagnosis: E. fulvus resembles E. mirabilis + because of the conical prolateral median apophysis on the male trochanter IV, and can be distinguished by: The ocularium with two large tubercles; median depression present on the male trochanter IV prolateral median apophysis; femur IV only with 1 proventral apical spine.

Redescription: Male (holotype): Dorsum ( Fig. 14A,B): Measurements: SL 4.40; SMW 3.50; femur I 2.45; II 4.45; III 3.25; IV 4.3. Median paracheliceral projection smaller than PAM. Ocularium far from anterior scutal margin; with 2 large tubercles, 7 small ones. Carapace with 20 scattered tubercles. Scutal area I with 43–46 scattered tubercles on each side; II with 98; III with 95 tubercles and a median spine oblique, pointing backwards, not surpassing groove V; IV with 59 tubercles. Posterior margin of dorsal scutum and free tergites I–III with rows of 10 and 23, 6 and 18, 6 and 20, 8 and 16 tubercles, respectively. Anal operculum with 36 tubercles.

Venter: Coxa I with 22–30 tubercles, median and distal ones largest; II with 47–53, distal ones largest; III– IV irregularly tuberculate.

Chelicera: Segment I smooth.

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

Legs ( Fig. 14C–I): Coxa II with 2–3 tubercles on retrolateral margin; IV densely tuberculate, with 1 oblique prolateral apical apophysis, this conical, long, curved posteriad and slightly ventrad; swollen in the middle on retroventral face. Trochanters I–IV with scattered tubercles; IV with 1 oblique prolateral median apophysis, this conical, with a median depression. Femur I with reduced PDS, RDS; II with small PDS, RDS; III sinuous, with small PDS, medium RDS; ventrally with a prolateral row of tubercles increasing in size distally, 1 large prolateral apical tubercle; IV sinuous, with medium PDS, RDS; with a proventral row of tubercles increasing in size distally, a retroventral row of small tubercles, 1 PVS. Tibia III ventrally with a row of tubercles slightly increasing in size subapically, 4 large. Tarsal segmentation: 6, 9, 6, 6.

Penis ( Fig. 40A,B): Stylus with medio-ventral trichomes, apex slightly swollen; with angular medioventral projection. Ventral process of glans curved; apex with flabelliform projection. Ventral plate with concave sides; with 3–4 pairs of long, straight distal setae; 3 pairs of straight basal setae close to each other.

Coloration: Yellowish brown; light brown on tarsi.

Female: Unknown.

Type locality: Brazil, Espírito Santo, Santa Teresa .

Geographical distribution ( Fig. 51): Known only from the type locality.