Eusarcus sergipanus, 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 : 99-101

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 ) .

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.