Eusarcus schubarti Soares & Soares
Creators: name: Hara, Marcos Ryotaro
name: Pinto-Da-Rocha, Ricardo
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Opiliones
Gonyleptidae
Eusarcus
Eusarcus schubarti

description: Eusarcus schubarti Soares & Soares   
(Figs. 30, 38A,B, 49A)  
 Eusarcus schubarti Soares & Soares 1946a: 203, figs. 6–8; 1954b: 262 (cat); Kury 2003a: 170 (cat); (ma holotype; “Refúgio Sooretama, Linhares, Espírito Santo, Brazil; 17.x.1944; O. Schubart leg.; MZSP 28657”; examined), (1 ma paratype; “Refúgio Sooretama, Linhares, Espírito Santo, Brazil; O. Schubart leg.; 17.x.1944; MZSP 1725”, examined), (1 ma “ allotype ”; “Refúgio Sooretama, Linhares, Espírito Santo; O. Schubart leg.; 20.x.1944; MZSP 28658”; examined). The “female” paratype described by Soares & Soares (1946a) actually is a beta male.   
 Material examined: BRAZIL. Espírito Santo: Linhares (Refúgio Sooretama), O. Schubart leg., 17.x.1944, ma holotype (MZSP 28657); idem, 20.x.1944, 1 ma paratype (MZSP 28658); idem, 2.x.1944, 1 ma paratype (MZSP 1725); São Mateus, Schubart leg., x.1944, 1 ma paratype (MZSP 1720); idem (R.F. C.V.R.D.), A.J. Santos leg., vii.1947, 1 ma & 1 fe (IBSP 2547); idem, 1 ma (IBSP 2548).   
 Diagnosis: E. schubarti and E. teresincola can be distinguished from most species of Eusarcus by the retrolateral apical apophysis of coxa IV and by the overall small size (e.g. dorsal scutum with circa 2 mm). E. schubarti can be distinguished from E. teresincola by: The presence of bifid PAM; femur IV with 1 bifid dorso-basal apophysis, a prolateral row of high, pointed tubercles decreasing in size distally.   
 Redescription: Male (holotype): Dorsum (Fig. 30A,B): Measurements: SL 1.90; SMW 1.70; femur I 1.04; II 1.95; III 1.20; IV 1.80. Median paracheliceral projection smaller than bifid PAM. Anterior margin with 1 small spine on each corner. Ocularium far from anterior scutal margin; low, with 2 spines. Carapace smooth. Scutal area I with 1–3 scattered tubercles on each side; II–IV with a transversal median row of 5, 8, 7 tubercles, respectively; median spine of scutal area III directed upward, slightly curved (apex broken). Lateral margin of dorsal scutum with an irregular row of 2–4 small tubercles, 3 large, pointed. Posterior margin of dorsal scutum and free tergites I–III with a row of 8, 9, 7, 7 pointed tubercles, respectively. Anal operculum with 12 tubercles.   
Venter: Coxa I with 11–12 tubercles, median and distal ones largest; II with 11–13 tubercles increasing in size distally, retrolateral distal ones largest; III with 12–15; IV irregularly tuberculate.  
Chelicera: Segment I with 2 tubercles.  
Pedipalpus: Trochanter dorsally inflated, with 2 tubercles. Femur dorsally smooth; with 1 ventral tubercle. Tibial setation: Prolateral IiIi, retrolateral IIi. Tarsal setation: Prolateral and retrolateral IIi.  
Legs (Fig. 30C–G): Coxa IV sparsely tuberculate, with 1 oblique prolateral apical apophysis, this conical, long, curved posteriad and ventrad, 1 retrolateral apical apophysis, this conical, short, straight. Trochanters I– III with scattered tubercles; IV prolaterally with 1 median apophysis, this conical with large base, blunt, swollen in the middle; 1 oblique apical apophysis, this conical, blunt, with 1 subapical tubercle; retrolaterally with 1 median apophysis, this conical, long, blunt; 1 oblique apical apophysis, this conical, long. Femora I–III with small tubercles; I–III with reduced PDS, RDS; III sinuous; ventrally with 2 large apical tubercles; IV sinuous, with 1 bifid dorso-basal apophysis, 1 prolateral row of high, pointed tubercles decreasing in size distally, 1 dorsal row of high, pointed tubercles increasing in size from subasal portion to the middle, medium PDS, reduced RDS, 1 dorso-apical median spine; ventrally with 2 rows of high, pointed tubercles increasing in size subapically, retrolateral ones enlarged, 2 apical spines. Tarsal segmentation: 5, 7, 6, 6.  
Penis (Fig. 38A,B): Stylus with medio-ventral trichomes, apex not inflated; without angular medio-ventral projection. Ventral process of glans curved; apex with flabelliform projection. Ventral plate with slightly concave sides; with 3 pairs of curved distal setae; 1 pair of short, straight median setae; 4 pairs of straight, thick basal setae.  
Coloration: Reddish brown; dark brown on body edges and legs. Light brown on tarsi.  
 Female (IBSP 2547): Dorsum: Measurements: SL 1.90; SMW 1.60; femur I 0.95; II 1.70; III 1.30; IV 1.80. Median paracheliceral projection larger than PAM. Anterior margin with 2 small spines on each corner. Carapace with 8 tubercles scattered. Scutal area III with median spine of medium size, slightly curved, not surpassing groove V. Pedipalpus: Tibial setation: Prolateral IiIi, retrolateral iIi. Legs: Coxa IV surpassing dorsal scutum in dorsal view only apically, with 1 oblique prolateral apical apophysis, this conical, shorter than in male, pointed; without retrolateral apical apophysis. Trochanter IV retrolaterally with 1 conical, short apical apophysis. Femur III ventrally only with rows of similar-sized tubercles; IV without dorso-basal apophysis, with dorsal and prolateral rows of similar-sized tubercles, small PDS, medium RDS; ventrally covered with small tubercles. Tarsal segmentation: 5, 7, 6, 5–6. Coloration: Brownish on mesotergum; dark brown on prosoma and trochanter. Parts of dorsal scutum and legs (except trochanter) with marble-like color pattern.   
 Variation in males (n=4): Measurements: SL 1.65–2.00; SMW 1.35–1.80; femur I 0.90–1.10; II 1.70– 1.95; III 1.20–1.60; IV 1.70–1.90. Median paracheliceral projection smaller or larger than PAM. Median spine of scutal area III with medium size, slightly curved, not surpassing groove V. Pedipalpus: Tarsal setation: Prolateral IiIi/IIi. Tarsal segmentation: 5, 7–8, 6, 6.   
 Type locality: Brazil, Espírito Santo, Linhares, Refúgio Sooretama.   
 Geographical distribution (Fig. 49A): Brazil. Espírito Santo.
description: Published as part of Hara, Marcos Ryotaro & Pinto-Da-Rocha, Ricardo, 2010, Systematic review and cladistic analysis of the genus Eusarcus Perty 1833 (Arachnida, Opiliones, Gonyleptidae) 2698, pp. 1-136 in Zootaxa 2698 on pages 97-99