Systematic review and cladistic analysis of the genus Eusarcus Perty 1833 (Arachnida, Opiliones, Gonyleptidae) 2698 Author Hara, Marcos Ryotaro Author Pinto-Da-Rocha, Ricardo text Zootaxa 2010 2010-12-03 2698 1 136 journal article 1175­5334 Eusarcus sergipanus sp. n. ( Figs. 31 , 41A,B , 50B ) Type material: BRAZIL . Sergipe : Itabaiana ( Parque Nacional de Itabaiana ; 10º 00´S 37º25´W ), A.D. Brescovit et al . leg., 14–20.ix.1999 , ma holotype ( IBSP 1750 ); idem, 1 ma paratype ( MZSP 28947 ) . FIGURE 31. Eusarcus sergipanus sp. n. Male (holotype): A, habitus, dorsal view; B, dorsal scutum, right lateral view; C, right coxa and trochanter IV, posterior view (in part); D, right femur III, dorsal view; E, idem, ventral view; F, right trochanter and femur IV, prolateral view; G, idem, dorsal view; H, idem, ventral view. Scale bars, 1 mm. Diagnosis: E . sergipanus resembles E . aduncus , E . berlae , E . elinae , E . fulvus , E . signatus , E . sooretamae , E . cavernicola and E . mirabilis because of the conical prolateral median apophysis on the male trochanter IV, and can be distinguished by: The presence of PAM; absence of a median spine on area III; basitarsus I not elongated; prolateral apical apophysis of male coxa IV with a triangular ventral projection; femur IV not longer than 1.5 times dorsal scutum length; ocularium with a pair of spines. Etymology: The name, an adjective, refers to the state where the species was collected. Description: Male ( holotype ): Dorsum ( Fig. 31A,B ): Measurements: SL 4.00; SMW 3.60; femur I 2.20; II 4.50; III 3.30; IV 4.00. Median paracheliceral projection smaller than PAM. Anterior margin with 3 tubercles on each corner. Ocularium far from anterior scutal margin; high, with 2 spines, 10 tubercles. Carapace with 34 scattered tubercles. Scutal area I with 15–16 scattered tubercles on each side; II with 25; III with 31 and without median spine; IV with 25 tubercles. Posterior margin of dorsal scutum and free tergites I– III with a row of 20, 17, 14, 11 tubercles, respectively. Anal operculum with 28 tubercles. Venter: Coxa I with 19–20 tubercles, median and distal ones largest; II with 45–54 tubercles, increasing in size distally; III–IV irregularly tuberculate. Chelicera: Segment I with 3 tubercles. Pedipalpus: Trochanter dorsally inflated, with 3 tubercles. Femur dorsally smooth; ventrally with 1 large basal tubercle, 2–3 small aligned ones. Tibial setation: Prolateral and retrolateral IiIi. Tarsal setation: Prolateral IIi, retrolateral IiIi. Legs ( Fig. 31C–H ): Coxa IV densely tuberculate, surpassing dorsal scutum in dorsal view only apically, with 1 transversal prolateral apical apophysis, this conical, short, blunt, with 1 ventral triangular projection in the middle. Trochanters I–IV with scattered tubercles; IV prolaterally with 1 median apophysis, this conical, curved anteriad; retrolaterally with 1 large apical tubercle. Femora I–II with reduced PDS, RDS; II ventrally with 2 rows of tubercles, prolateral ones slightly increasing in size distally, 1 large prolateral apical tubercle; III slightly sinuous, with reduced PDS, small RDS; ventrally with 2 rows of tubercles increasing in size distally, prolateral ones enlarged, 1 PVS; IV slightly sinuous, with small PDS, RDS; ventrally with 2 rows of tubercles, prolateral ones increasing in size distally, 1 PVS. Metatarsus I with 2 ventro-apical setae. Tarsal segmentation: 5–6, 8, 6, 6. Penis ( Fig. 41A,B ): Stylus with medio-ventral trichomes, apex swollen; with angular medio-ventral projection. Ventral process of glans curved; apex thin, with flabelliform projection. Ventral plate with concave sides; with 3 pairs of apically curved distal setae; 2 ventral pairs of distal tubercles; 1 pair of short, straight median setae; 4 pairs of straight basal setae. Coloration: Dark brown; brown on grooves of dorsal scutum. Female : Unknown. Variation in males (n=2): Measurements: SMW 3.60–3.70; femur I 2.20–2.50; II 4.20–4.50; III 3.10–3.30; IV 3.90–4.00. Tarsal segmentation: 4–5(2–3), 8–9, 6, 6. Coloration: Dark brown to slightly lighter brown. Type locality: Brazil , Sergipe , Itabaiana , Estação Ecológica de Itabaiana . Geographical distribution ( Fig. 50B ): Known only from the type locality.