Eusarcus matogrossensis, 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 : 81-83

Eusarcus matogrossensis sp. n.

( Figs. 24, 48A,B, 49B)

Type material: BRAZIL. Mato Grosso: Chapada dos Guimarães, A. Giupponi leg., 21.i.2000, ma holotype ( MNRJ 4343 ) ; without locality, E. Froelich leg., 22.ii.1983, 1 ma & 1 fe paratypes ( MNRJ 17690 ) ; idem, 1 ma paratype ( MZSP 28667 ) .

Diagnosis: E. matogrossensis 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 presence of PAM; ocularium high, with 2 spines; median spine of scutal area III of medium size, not surpassing groove V; femur IV with prolateral (tubercles far from each other), proventral (only distally) and retrolateral rows of high, pointed tubercles; only 1 ventro-apical spine.

Etymology: The name, an adjective, refers to the state where the species was collected.

Description: Male (holotype): Dorsum ( Fig. 24A,B): Measurements: SL 4.30; SMW 3.80; femur I 2.35; II 4.20; III 3.00; IV 3.80. Median paracheliceral projection of similar-size as PAM. Ocularium far from anterior scutal margin; high, with 2 spines, 9 tubercles. Carapace with 20 scattered tubercles. Scutal area I with 21–26 scattered tubercles on each side; II with 53; III with 51 and a median spine of medium size, not surpassing groove V; IV with 45 tubercles. Posterior margin of dorsal scutum and free tergites I–III with rows of 11 and 16, 8 and 17, 6 and 16, 12 and 14 tubercles, respectively. Anal operculum with 42 tubercles.

Venter: Coxa I with 30–34 tubercles, median and distal ones largest; II with 50–52, distal ones largest; III– IV irregularly tuberculate.

Chelicera: Segment I with 4 tubercles.

Pedipalpus: Trochanter dorsally inflated, with 3 tubercles. Femur dorsally with 3–4 aligned tubercles; ventrally with 1 large basal tubercle, 5–6 small aligned ones, 2 prolateral subapical setae. Tibial setation: Prolateral and retrolateral IiiIi. Tarsal setation: Prolateral and retrolateral IIi/IiIi.

Legs ( Fig. 24C–I): Coxa II with 5–6 tubercles on retrolateral margin; IV densely tuberculate, with 1 oblique prolateral apical apophysis, this conical, long, blunt, curved posteriad and ventrad. Trochanters I–IV with scattered tubercles; I–II with 1 large ventro-basal tubercle; IV prolaterally with 1 basal apophysis, this conical, short, blunt, swollen in the middle; retrolaterally with 1 apical apophysis, this conical, short, blunt. Femur I with small PDS, reduced RDS; II–III with small PDS, RDS; III sinuous, ventrally with 2 rows of tubercles, prolateral one increasing in size distally, becoming high, pointed, with 1 large prolateral apical tubercle; IV sinuous, with a prolateral row of short, pointed tubercles increasing in size to the middle portion, some becoming high; a retrolateral row of high, pointed tubercles; medium PDS, RDS, retrolateral one blunt, slightly smaller; ventrally with 2 rows of tubercles, prolateral ones increasing in size distally, becoming high, pointed, 1 prolateral apical spine, 1 large retrolateral apical tubercle. Tibia III ventrally with 2 rows of tubercles increasing in size subapically, a retrolateral row of enlarged tubercles; IV ventrally with 2 rows of tubercles increasing in size distally, prolateral ones enlarged, 2 apical spines, prolateral one largest. Tarsal segmentation: 6, 8, 6, 6.

Penis ( Fig. 48A,B): Stylus with ventro-median trichomes, apex slightly swollen; with angular medioventral projection. Ventral process of glans curved, apex with flabelliform projection. Ventral plate with concave sides; with 3 pairs of slightly curved distal setae; 2 pairs of small ventro-distal setae; 1 pair of short, straight median setae; 4 pairs of straight basal setae.

Coloration: Brown; light brown on tarsi.

Female (paratype; MNRJ 17690): Dorsum: Measurements: SL 3.70; SMW 3.20; femur I 2.00; II 3.60; III 2.70; IV 3.50. Median paracheliceral projection larger than PAM. Pedipalpus: Femur ventrally with 1 large basal tubercle, 3–5 small aligned ones, 1 prolateral subapical seta. Legs: Coxa IV densely tuberculate, with 1 oblique prolateral apical apophysis, this conical, short. Trochanter IV with scattered tubercles; retrolaterally with 1 conical short apical apophysis. Femora I–II with reduced PDS, RDS; III reduced PDS, small RDS; ventrally with 2 rows of tubercles slightly increasing in size distally, prolateral ones enlarged, with 1 large prolateral apical tubercle; IV with prolateral and retrolateral rows of similar-sized tubercles; ventrally with 2 rows of tubercles, prolateral ones increasing in size distally, 1 large pointed prolateral apical tubercle. Tibiae III–IV with rows of similar-sized tubercles, without spines. Metatarsus I with 1 retroventral apical seta. Tarsal segmentation: 6, 8, 6, 6.

Variation in males (n=3): Measurements: SL 3.90–4.30; SMW 3.50–3.80; femur I 2.10–2.40; II 3.80– 4.20; III 2.60–3.00; IV 3.30–3.80. Pedipalpus: Femur with 1–2 prolateral subapical setae; Tibial setation: Prolateral IiiIi/IiIi, retrolateral IiiIi. Femora I, III with reduced or small PDS; II with reduced or small RDS. Tarsal segmentation: 5–6, 8–10, 6, 6.

Type locality: Brazil, Mato Grosso, Chapada dos Guimarães .

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