Eusarcus teresincola Soares & Soares

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 : 108-110

Eusarcus teresincola Soares & Soares

( Figs. 35, 38C,D, 50B)

Eusarcus teresincola Soares & Soares 1946a: 205 , fig. 9; 1954b: 262 (cat); Kury 2003a: 170 (cat). (fe holotype; “Santa Teresa, Penha, Espírito Santo; Schubart leg.; 30.x.1944; MZSP 28650”; examined, in bad state of preservation).

Material examined: BRAZIL. Espírito Santo: Santa Teresa ( Penha ), Schubart leg., 30.x.1944, fe holotype ( MZSP 28650 ) ; São Mateus ( Reserva Florestal Vale do Rio Doce ), A.J. Santos leg., vii.1997, 1 ma ( IBSP 2545 ) ; idem without name of collector, i.1998, 1 fe ( IBSP 3152 ) ; idem, vii.1997, 1 ma & 1 fe ( IBSP 3154 ) .

Diagnosis: E. teresincola resembles E. schubarti because of the retrolateral apical apophysis of coxa IV and overall small size (e.g. dorsal scutum circa 2 mm long), and can be distinguished by: The absence of PAM; femur IV with 2 high, pointed dorso-median tubercles and a dark brown reticulated pattern clearly marked on dorsal scutum.

Description: Male (IBSP 3154): Dorsum ( Fig. 35A,B): Measurements: SL 2.20; SMW 2.00; femur I 1.10; II 1.75; III 1.40; IV 1.70. PAM absent. Anterior margin with 2 large tubercles on each corner. Ocularium far from anterior scutal margin; low, with 2 large pointed tubercles, 2 small ones. Carapace with 4 scattered tubercles. Scutal area I with 3–4 scattered tubercles on each side; II–IV with a transversal median row of 10, 10, 9 tubercles, respectively; median spine of scutal area III of medium size, curved, not surpassing groove V. Lateral margin of dorsal scutum with an irregular row of 2–4 small tubercles and 1–3 large pointed ones. Posterior margin of dorsal scutum and free tergites I–III with a row of 10, 10, 9, 10 pointed tubercles, respectively. Anal operculum with 12 tubercles.

Venter: Coxae I–II with 19–20, 26–27 tubercles, respectively, median and distal ones largest; III with 21– 23; IV irregularly tuberculate.

Chelicera: Segment I with 3 tubercles.

Pedipalpus: Trochanter dorsally inflated, with 2 tubercles. Femur dorsally with scattered tubercles; ventrally with a small basal tubercle. Tibial setation: Prolateral IiIi, retrolateral IIi/iIi. Tarsal setation: Prolateral and retrolateral IiIi.

Legs ( Fig. 35C–G): Coxa II with 1–2 tubercles on retrolateral margin; IV sparsely tuberculate, with 1 oblique prolateral apical apophysis, this conical, long, curved posteriad and ventrad, 1 retrolateral apical apophysis, this conical, short, straight. Trochanters I–IV with scattered tubercles; IV prolaterally with 1 median apophysis, this conical with large base, blunt, swollen in the middle; 1 oblique apical apophysis, this conical, blunt; retrolaterally with 1 median apophysis, this conical, blunt; 1 oblique conical apical apophysis. Femora I–III with small tubercles; I–II with reduced PDS, RDS; I ventrally with 2 rows of moderately enlarged tubercles, retrolateral ones enlarged; III sinuous, with reduced PDS, small RDS; ventrally with 2 rows of tubercles increasing in size distally, 2 large apical tubercles; IV sinuous, with 2 high, pointed, dorsomedian tubercles, prolateral and dorsal rows of enlarged tubercles, reduced PDS, RDS, 1 median dorso-apical spine; ventrally with 2 rows of high, pointed tubercles increasing in size distally, retrolateral ones enlarged, 2 apical spines. Tarsal segmentation: 6, 7, 6, 6.

Penis ( Fig. 38C,D): Stylus with medio-ventral trichomes, apex not inflated; without angular medio-ventral projection. Ventral process of glans curved; apex with flabelliform projection. Ventral plate with slightly concave sides; with 3 pairs of apically curved distal setae; 1 pair of short, straight, blunt median setae; 4 pairs of straight, thick setae.

Coloration: Brown, with clearly marked dark brown reticulated pattern on dorsal scutum. Light brown on metatarsi and tarsi.

Female (holotype): Measurements: SL 2.00; SMW 1.85; femur I 1.00; II 1.75; III 1.35; IV 1.85. Legs: Coxa IV with 1 oblique prolateral apical apophysis, this conical, short, pointed, curved backwards, surpassing posterior margin of this segment; without retrolateral apical apophysis. Trochanter IV with few small scattered tubercles, retrolaterally with 1 large subapical tubercle. Femur I with rows of similar-sized tubercles; III ventrally only with 1–3 enlarged scattered tubercles (none on apex); IV only with rows of similar-sized tubercles. Tarsal segmentation: 4–5(2–3), 7, 6,?. Coloration: Brown; dark reddish brown on edges of dorsal scutum and on patellae II–IV.

Variation in males (n=2): Measurements: SL 2.05–2.20; SMW 1.80–2.00; femur I 1.00–1.10; IV 1.60– 1.70. Femur IV with reduced to medium PDS. Tarsal segmentation: 6, 7–8, 6, 6.

Variation in females (n=3): Measurements: SL 2.00–2.30; SMW 1.85–2.10; femur I 1.00–1.10; II 1.60– 1.75; III 1.35–1.40; IV 1.80–1.85. Tarsal segmentation: 4–6(2–3), 7, 6, 6.

Type locality: Brazil, Espírito Santo, Santa Teresa: Penha .

Geographical distribution ( Fig. 50B): Brazil. Espírito Santo.