Protimesius jirau Bragagnolo, 2013, sp. nov.
Creators: name: Bragagnolo, Cibele
Publisher: name: Zenodo
Year: 2013
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Opiliones
Stygnidae
Protimesius
Protimesius jirau

description: Protimesius jirau sp. nov.
(Figs. 3 A–I; 4D–F)
Types data: Brazil, Rondonia state, Porto Velho (Caiçara), 27.II.2010, M.C. Silveira leg. [3 holotype (MZSP 33199), paratypes (MZSP 33119, 2Ƥ 23; MNRJ 0 7215, 1Ƥ 13)].
Etymology. The specific name “ jirau ”, a noun in apposition, originates from the Tupi language and makes reference to the “ Jirau Hydroelectric Station”, locality where the species was collected.
Diagnosis: This species is similar to P. c ir io Villareal-Manzanilla & Pinto-da-Rocha and P. laevis (Sorensen, 1932) by the presence of a large, pointed, dorso-apical apophysis on male trochanter IV. It differs from the others species of Protimesius due to the absence of a ventral row of tubercles on male femur IV—present in all species of the genus except P. longipalpis and P. a p i a c a s — and the presence of a ventrobasal curved apophysis on femur IV.
Description of male (holotype MZSP 33199): Measurements: Dorsal scute length 4.7; prosoma length 2.1; dorsal scute width 3.85; prosoma width 3.8; interocular distance 2.3.
Dorsum (Fig. 3 A, B). Prosoma: anterior margin smooth, with low anterior eminence with two tubercles. Ocularium and lateral margin smooth. Area I divided, smooth. Area II smooth. Area III with two high parallel spiniform apophysis. Posterior margin straight and smooth; free tergites I–III smooth.
Venter: Coxa I with a median row of four tubercles; II with a median row of five tubercles, two apical; III and IV irregularly and minutely tuberculated. Free sternites I–III with a row of minute granules. Anal plate covered irregularly with minute granules.
Chelicera: Swollen. Segments I–II smooth; III with two distal teeth.
Pedipalpus (Fig. 3 H, I). Coxa with large dorso-basal apophysis and three pointed tubercles; ventral with three pointed tubercles. Trochanter with one ventral tubercle. Femur with one ventro-basal tubercle. Patella unarmed. Tibia mesal IIiIi, ectal IIiIi; Tarsus mesal IiIiIi; ectal IiiIi.
Legs (Fig. 3 C–G): Coxa I with two dorsal tubercles; II with two dorsal tubercles, one anterior and one larger, posterior; III with one dorsal apical tubercle; IV dorsally minutely tuberculated. Trochanter I–III smooth, IV with two ventral tubercles and one pointed dorso-apical apophysis. Femora I–III smooth, IV with a ventro-basal curved apophysis and a basal retrolateral row of seven tubercles. Patella IV with a pointed ventro-apical apophysis. Tibia IV with one retrolateral row with nine tubercles on distal 2/3; one bifid prolateral and one large retrolateral apical apophysis. Tarsal segmentation: 8:20:7:8.
Penis (Fig. 4 D–F): ventral plate with lateral and distal margin straight, with three distal pairs of long curved setae and one intermediary short pair; six basal pairs of setae; dorsal process present; stylus serrate apically.
Color: In alcohol mostly yellowish brown, apophyses of area III dark brown.
Female (Paratype MZSP 33119): Measurements: Dorsal scute length 4.7; prosoma length 2.0; dorsal scute width 4.0; prosoma width 3.5; interocular distance 2.0.
Similar to male, except for: Chelicera not swollen; prosoma without low anterior eminence. Pedipalpal tibia mesal IiiIi, ectal IIiIi; tarsus mesal IiIiIi, ectal Iiii. Legs finely granular; femur IV smooth.
Distribution: Known only for the type-locality.
description: Published as part of Bragagnolo, Cibele, 2013, Two new species of Protimesius from northern Brazil (Opiliones: Laniatores: Stygnidae), pp. 283-292 in Zootaxa 3620 (2) on pages 288-289, DOI: 10.11646/zootaxa.3620.2.6, http://zenodo.org/record/223123