Eusarcus sergipanus Hara & Pinto-Da-Rocha 2010, sp. n.
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 sergipanus

description: 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.
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 99-101