Eusarcus tripectinatus, 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 : 111-113

Eusarcus tripectinatus sp. n.

( Figs. 36, 45A,B, 49A)

Type material: BRAZIL. Minas Gerais: Rio Preto , Exp. Arachné leg., 14–20.v.2002, ma holotype, 6 ma & 4 fe paratypes ( MNRJ 8927 ) ; idem, 3 ma & 3 fe paratypes ( MZSP 28663 ) ; idem, 3 fe ( MNRJ 11360 ) .

Diagnosis: E. tripectinatus resembles E. caparaoensis + and E. manero +, which have a conical, short, blunt prolateral basal apophysis on the male trochanter IV, and can be distinguished by: The absence of PAM; ocularium low, with 2 moderately enlarged tubercles; median spine of scutal area III of medium size, reaching groove V; trochanter IV with a short prolateral apical apophysis inserted dorsally; femur IV with prodorsal, prolateral (only basal third) and retrolateral rows of high, pointed tubercles, 2 ventro-apical spines.

Etymology: From the Greek “tria” (=three) and from the Latin “pectinatus” (=with a comb), in reference to the three rows of high, pointed tubercles on femur IV.

Description: Male (holotype): Dorsum ( Fig. 36A,B): Measurements: SL 3.10; SMW 2.60; femur I 1.40; II 2.80; III 2.10; IV 2.60. PAM absent. Anterior margin of prosoma with 3 tubercles on each corner. Ocularium far from anterior scutal margin; low, with 2 moderately enlarged tubercles, 4 small ones. Carapace with 23 scattered tubercles. Scutal area I with 19–20 scattered tubercles on each side; II with 30; III with 34 and a median spine of medium size reaching groove V; IV with 26 tubercles. Posterior margin of dorsal scutum and free tergites I–III with a row of 14, 12, 9, 11 tubercles, respectively. Anal operculum with 23 tubercles.

Venter: Coxa I with 18–19 tubercles, median and distal ones largest; II with 29–33 tubercles, distal ones largest; III–IV irregularly tuberculate.

Chelicera: Segment I with 3 tubercles.

Pedipalpus: Trochanter dorsally inflated, with 2 tubercles. Femur dorsally smooth; ventrally with 1 large basal tubercle, 2 small scattered ones. Tibial setation: Prolateral and retrolateral IiIi. Tarsal setation: Prolateral IIi, retrolateral IiIi.

Legs ( Fig. 36C–I): Coxa II with 1 tubercle on retrolateral margin; IV densely tuberculate, with 1 oblique prolateral apical apophysis, this conical, long, blunt, curved posteriad and ventrad, ventrally swollen in the middle. Trochanters I–IV with scattered tubercles; IV prolaterally with 1 basal apophysis, this conical, short, blunt, swollen in the middle; 1 apical apophysis, this conical, short, blunt. Femur I with small PDS, RDS; II– III with small PDS, large RDS; III sinuous, ventrally with 2 rows of tubercles, prolateral ones increasing in size distally, with 1 large prolateral apical tubercle; IV sinuous, with prodorsal and prolateral rows of high, slightly pointed tubercles in basal half; retrolateral row of high, pointed tubercles decreasing in size distally; medium PDS, large RDS; ventrally with 2 rows of tubercles, prolateral ones increasing in size distally, becoming high, pointed, retrolateral row disappearing in distal half, 2 apical spines. Tibia III ventrally with 2 rows of tubercles increasing in size subapically, becoming high, pointed, retrolateral ones enlarged; IV with 2 apical spines. Metatarsus I with 1 proventral apical seta. Tarsal segmentation: 5, 7, 6, 6.

Penis ( Fig. 45A,B): Stylus smooth, apex slightly swollen; with angular medio-ventral projection. Ventral process of glans curved; apex blunt. Ventral plate with concave sides; with 3 pairs of apically curved distal setae; 1 pair of short, straight median setae; 4 pairs of straight basal setae.

Coloration: Brown; dark brown on prolateral apical apophysis of coxa IV and legs. Light brown on tarsi.

Female (paratype; MNRJ 8927): Measurements: SL 3.10; SMW 2.40; femur I 1.20; II 2.40; III 1.80; IV 2.30. Pedipalpus: Tibial setation: Prolateral IiIi, retroloateral iIi/iiIi. Legs: Coxa IV with 1 oblique prolateral apical apophysis, this conical, short, pointed. Trochanter IV with scattered tubercles, prolaterally with 1 large apical tubercle. Femur III ventrally with 2 rows of tubercles slightly increasing in size distally, prolateral ones enlarged, with 1 large prolateral apical tubercle; IV with dorsal, prolateral and retrolateral rows of similarsized tubercles; ventrally with 2 rows of tubercles, prolateral ones slightly increasing in size distally, 1 large prolateral apical tubercle. Tibiae III–IV with rows of similar-sized tubercles, without apical spines. Tarsal segmentation: 5, 7, 6, 6.

Variation in males (n=6): Measurements: SL 3.05–3.30; SMW 2.50–2.65; femur I 1.30–1.40; II 2.60– 2.80; III 2.00–2.10; IV 2.40–2.60. Pedipalpus: Tibial setation: Prolateral IiIi/IIi, retrolateral IiIi/iiIi. Tarsal setation: Retrolateral IiIi/IIi. Femora I–II with reduced or small PDS.

Variation in females (n=6): Measurements: SL 3.10–3.35; SMW 2.40–2.70; femur I 1.20–1.40; II 2.40– 2.60; III 1.80–2.00; IV 2.30–2.50. Pedipalpus: Tibial setation: Retrolateral IiIi/iiIi/iIi. Tarsal setation: Retrolateral IiIi/Iiii. Femur I with reduced or small PDS, RDS.

Type locality: Brazil, Minas Gerais, Rio Preto .

Geographical distribution ( Fig. 49A): Known only from the type locality.