Eusarcus mirabilis, 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 : 83-85

Eusarcus mirabilis sp. n.

( Figs. 25, 39E,F, 50A)

Eusarcus hastatus : [misid] B. Soares 1945c: 375 (cat [pars]).

Type material: BRAZIL. Minas Gerais: Marliéria (Parque Estadual Rio Doce ), W.R. Lourenço leg., 1998, ma holotype & 2 fe paratypes ( MNRJ 5772 ) ; idem, 1 ma & 1 fe ( MZSP 28662 ) ; Viçosa, J. Moojen leg., without date, 1 ma paratype ( MNRJ 58044 ) .

Diagnosis: E. mirabilis resembles E. aduncus , E. berlae , E. elinae , E. fulvus , E. signatus , E. sooretamae , E. cavernicola and E. sergipanus because of the conical prolateral median 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 of medium size; basitarsus I not elongated; tibia III with two ventral rows of tubercles increasing in size distally, becoming high, pointed; prolateral apical apophysis of coxa IV without projections on retrolateral margin and curved upwards; conical prolateral median apophysis on the male trochanter IV oblique, long, curved back and upwards, basally swollen; femur IV not more than 1.5 times longer than dorsal scutum.

Etymology: The Latin adjective “mirabilis”is in reference to the remarkable prolateral apophysis of trochanter IV.

Description: Male (holotype): Dorsum ( Fig. 25A,B): Measurements: SL 4.35; SMW 3.90; femur I 2.00; II 3.90; III 3.10; IV 3.85. PAM absent. Anterior margin with 3–4 pointed tubercles on each corner. Ocularium far from anterior scutal margin; with 5 pointed tubercles. Carapace with 12 scattered tubercles. Scutal area I with 24–28 scattered tubercles on each side; II with 43; III with 61 and a median spine of medium size, curved backwards, more abruptly so subapically, reaching groove V; IV with 32 tubercles. Posterior margin of dorsal scutum with an irregular row of 22 tubercles. Free tergite I with a row of 18 tubercles; II–III with an irregular row of 17, 14 tubercles, respectivey. Anal operculum with 33 tubercles.

Venter: Coxa I with 24–33 tubercles, median and distal ones largest; II–III with 45–47, 45–53, respectively, increasing in size distally; IV densely and irregularly tuberculate.

Chelicera: Segment I with 5–6 tubercles.

Pedipalpus: Trochanter dorsally inflated, with 3–4 tubercles. Femur dorsally smooth; ventrally with 1 large pointed basal tubercle, 2 small scattered ones. Tibial setation: Prolateral III/IiII, retrolateral IiIi. Tarsal setation: Prolateral IIi, retrolateral IiIi.

Legs ( Fig. 25C–I): Coxa IV densely tuberculate, with 1 very oblique prolateral apical apophysis, this conical, long, blunt, slightly curved up and backwards. Trochanters I–IV with scattered tubercles; I–III with large retrolateral tubercles; I–II with 1 large ventro-basal tubercle; III with 1–2 large pointed retrolateral apical tubercles; IV prolaterally with 1 oblique median apophysis, this conical, long, pointed, curved up and backwards, swollen basally; retrolaterally with 1 large apical tubercle. Femora I–II with reduced PDS, RDS; I ventrally with 2 irregular rows of slightly enlarged tubercles; III slightly sinuous, reduced PDS, small RDS, ventrally with 2 rows of tubercles increasing in size distally, prolateral ones enlarged, 1 blunt prolateral apical spine; IV slightly sinuous, with small PDS, RDS; ventrally with 2 irregular rows of tubercles. Tibia III ventrally with 2 irregular rows of pointed tubercles increasing in size distally, retrolateral ones enlarged, 2 apical spines; IV with enlarged pointed apical tubercles. Metatarsus I without pair of ventro-apical setae on one side and with 2 ventro-apical setae on the other; IV thickened, with tubercles decreasing in size and number distally. Tarsal segmentation: 6, 9–11, 6, 6.

Penis ( Fig. 39E,F): Stylus with medio-ventral trichomes, apex slightly swollen; with angular medioventral projection. Ventral process of glans curved; apex with flabelliform projection. Ventral plate with concave sides; with 4 pairs of long, slightly curved distal setae; 2 pairs of short, straight median setae (basalmost pair smallest); 4 pairs of straight basal setae.

Coloration: Brown on body, chelicera and pedipalps; dark brown on legs. Light brown on metatarsi and tarsi I–II and tarsi III–IV.

Female (paratype; MNRJ 5772): Dorsum: Measurements: SL 3.15; SMW 3.05; femur I 1.40; II 2.90; III 2.15; IV 2.70. Posterior margin of dorsal scutum and free tergites I–III with rows of 20 and 26, 14 and 28, 5 and 26, 9 and 19 tubercles, respectively. Pedipalpus: Tibial setation: Prolateral and retrolateral IiIi. Legs: Coxa II with 1–2 prolateral tubercles, 4–5 retrolateral ones; IV densely tuberculate, with 1 very oblique prolateral apical apophysis, this conical, pointed, curved backwards, surpassing posterior margin of this segment. Trochanter III with scattered tubercles, retrolateral ones largest; IV with scattered tubercles, retrolaterally with 1 median, 1 subapical, 1 large apical tubercles. Femur I ventrally with rows of similar-sized tubercles; III ventrally with 2 rows of tubercles slightly increasing in size distally, prolateral ones enlarged, 1 large prolateral apical tubercle; IV with 1 large proventral tubercle. Metatarsus I without ventro-apical setae. Tarsal segmentation: 6, 8, 6, 6. Coloration: Brown on body, chelicera, pedipalps, most part of legs and tarsi; dark brown on trochanters, base and apex of femora and tibiae, patellae and metatarsi.

Variation in males (n=3): Measurements: SL 4.00–4.40; SMW 3.50–3.90; femur I 1.90–2.00; II 3.70– 3.90; III 2.80–3.10; IV 3.60–3.90. Pedipalpus: Tibial setation: Prolateral IiII/III/IIi/Ii, retrolateral IiIi.

Variation in females (n=3): Measurements: SL 2.90–3.15; SMW 2.60–3.05; femur I 1.30–1.40; II 2.70– 2.90; III 2.00–2.15; IV 2.60–2.70. Femur II with reduced or small PDS, reduced or medium RDS; III with reduced or small PDS, small or medium RDS; IV with small or medium PDS, RDS.

Type locality: Brazil, Minas Gerais, Marliéria, Parque Estadual Rio Doce .

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