Eusarcus caparaoensis, 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 : 39-42

Eusarcus caparaoensis sp. n.

( Figs. 8, 44C,D, 50B)

Type material: BRAZIL. Minas Gerais: Alto Caparaó (Parque Nacional Caparaó), Eq. Biota leg., 1– 5.v.2002, ma holotype ( IBSP 2904 ) ; idem, 1 fe paratype ( IBSP 2895 ) ; idem, 1 fe paratype ( IBSP 2903 ) ; Santa Bárbara (EPDA PETI), M.S. Pena leg., 15.x.1991, 1 ma paratype ( MNRJ 11358 ) ; Viçosa, J. Moojen leg., without date, 1 fe paratype ( MNRJ 58038 ) .

Diagnosis: E. caparaoensis 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 with similar-sized tubercles; median spine of scutal area III long, curved backwards, surpassing posterior margin of dorsal scutum; femur IV ventrally with a prolateral row of tubercles increasing in size distally and with 2 apical spines.

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

Description: Male (holotype): Dorsum ( Fig. 8A,B): Measurements: SL 3.00; SMW 2.90; femur I 1.45; II 2.80; III 2.10; IV 2.70. PAM absent. Ocularium next to anterior scutal margin; with 12 tubercles. Carapace with 55 scattered tubercles. Scutal area I with 45–47 scattered tubercles on each side; II with 58; III with 46 and a median spine long, curved backwards, surpassing posterior margin of dorsal scutum; IV with 48 tubercles. Posterior margin of dorsal scutum and free tergites I–II with a regular row of 13, 14, 11 tubercles, respectively; III with an irregular row of 13 tubercles. Anal operculum with 23 tubercles.

Venter: Coxa I with 15–18 tubercles, median and distal ones largest; II with 44–48, 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. Tibial setation: Prolateral IiIi, retrolateral iiI/IiIi. Tarsal setation: Prolateral IIi, retrolateral IiIi.

Legs ( Fig. 8C–J): Coxa 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 ventrobasal tubercle; IV with 1 prolateral basal apophysis, this conical, short, blunt; retrolaterally with 1 large pointed median tubercle, 1 short apical apophysis. Femur I with reduced PDS, RDS; II with reduced PDS, small RDS; III sinuous, with reduced PDS, medium RDS; ventrally with 2 rows of tubercles increasing in size distally, prolateral ones enlarged, 1 large prolateral apical tubercle; IV sinuous, with medium PDS, RDS, ventrally with a prolateral row of tubercles increasing in size distally, 2 apical spines. Tibia III with a retroventral row of high, pointed tubercles; IV with 2 ventro-apical spines. Metatarsus I with 2 ventro-apical setae. Tarsal segmentation: 6, 8, 6, 6.

Penis ( Fig. 44C,D): Stylus with medio-ventral trichomes, apex slightly swollen; with angular medioventral projection. Ventral process of glans curved, with apex blunt. Ventral plate with slightly concave sides; with 3 pairs of curved distal setae; 1 pair of short, straight median setae; 1 ectal curved median seta, absent on the left side; 4 pairs of straight basal setae, basalmost pair situated more ventrally.

Coloration: Brown on most parts of the body; dark brown on prolateral apical apophyses of coxa IV and trochanter IV. Black reticulated pigments all over the body (except on articulations), more concentrated on patella, on metatarsi, tarsi and apex of femora.

Female (paratype; IBSP 2903): Dorsum: Measurements: SL 3.10; SMW 2.90; femur I 1.20; II 2.20; III 1.70; IV 2.30. Anterior margin of prosoma with 1–2 large tubercles on each corner. Scutal area III with median spine of medium size, curved backwards, surpassing groove V, but not posterior margin of dorsal scutum. Posterior margin of dorsal scutum with irregular rows of 12 and 20 tubercles; free tergite I with an irregular row of 24; II–III with rows of 5 and 20, 7 and 19 tubercles, respectively. Pedipalpus: Tibial setation: Prolateral and retrolateral IiIi. Legs: Coxa IV densely tuberculate, with 1 oblique prolateral apical apophysis, this conical, short, curved dorsad. Trochanter IV with scattered tubercles, 1 large pointed apical tubercle. Femur III ventrally with two irregular rows of tubercles slightly increasing in size distally, prolateral ones enlarged, 1 large prolateral apical tubercle; IV ventrally with 2 rows of tubercles, prolateral one slightly increasing in size distally, with 1 large prolateral apical tubercle. Tarsal segmentation: 6, 9, 6, 6.

Variation in males (n=2): Measurements: SL 3.00–3.20; SMW 2.90–3.00; femur I 1.45–1.60; II 2.80– 3.50; III 2.10–2.40; IV 2.70–3.00. Pedipalpus: Tibial setation: Retrolateral IiIi/IiI/iiI. Femur II with reduced or small PDS, small or medium RDS. Tarsal segmentation: 6, 8–10, 6, 6. Coloration alive: Dark brown in most parts of the body; with orange-brown spots on carapace and lateral margins of abdominal scutum. Light brown on tarsi.

Variation in females (n=2): Measurements: SL 3.10–3.15; SMW 2.80–2.90; femur I 1.20–1.50; II 2.20– 2.90; III 1.70–2.20; IV 2.30–2.80. Femur I with reduced or small PDS. Tarsal segmentation: 6, 7–9, 6, 6.

Type locality: Brazil, Minas Gerais, Alto Caparaó, Parque Nacional do Caparaó .

Geographical distribution ( Fig. 50B): Brazil. Minas Gerais.