Discocyrtanus Roewer 1929
Creators: name: Kury, Adriano B.
name: Carvalho, Rafael N.
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Opiliones
Gonyleptidae
Discocyrtanus

description: Discocyrtanus Roewer, 1929, revalidated
Discocyrtanus Roewer, 1929: 250; Mello-Leitão 1932: 199 [junior subjective synonym of Discocyrtus Holmberg, 1878, by B. Soares (1944); type species: Discocyrtanus goyazius Roewer, 1929, by monotypy].
Etymology. The formation of this name is simply a variation of Discocyrtus. Gender masculine.
Diagnosis. Dorsal scutum on males widest more posteriorly than that of females, with laterals of area II curved backwards displacing area III. Ocularium moderately elevated (ca. 2x eye diameter), armed with a pair of extremely high (ca. 3.5x eye diameter) acuminate parallel or divergent spines (Figs 3 a, d, g, j, m). Femur and tibia III of males unarmed and not incrassate (Figs 1 d–e). Posterior border of coxa IV of males in situ not reaching posterior border of dorsal scutum (Figs 5 a, 10a). Coxa IV of males prodorsal distal apophysis thick falciform, moderately elongate, with small accessory blunt branch (Figs 5 a–b, 10a–b); females only have a small acuminate tubercle. Trochanter IV of males elongate (twice longer than wide), armed with robust and curved prodorsal distal apophysis (Figs 5 a, 10a). Fe IV of males (Figs 5 d–g, 10d–g) covered with diverse rows of tubercles and/or spines and sometimes more intensely sigmoid (females always have femur IV only slightly arched). Each species has differently located stronger spines on femur IV. All species have a row of 6 to 18 prolateral spatulate spines on distal half (Figs 2 a–e). Ventral plate of penis (VP) sharply divided into two regions: distal part rectangular, proximal part elliptical. Ventral surface of VP entirely covered with microsetae (Figs 7 c, 8c). All macrosetae inserted on lateral of VP (Figs 7 b, 8a): A1–A3, cylindrical, thick, acuminate, forming a triangle on basal third of VP; B inserted ventrally, proximal to A3; C1–C3 slender, only moderately elongate, forming a tight row on the distal part of VP; D1 small, midway between C3 and A1. Glans sac short, arising from middle bulge on podium, not extended as a dorsal process (Figs 7 a, 8d). Stylus (Figs 9 e, 11f) stout, strongly flattened and curved to ventral, with dorsal ditch, without any processes. Apex of stylus densely spiny, projected as a pair of curved horns, also densely spiny (Figs 6 f, 9g).
Remarks. As no significant differences have been found among the male genitalia, no individual descriptions are made of them.
Included species. Discocyrtanus bugre sp. nov., Discocyrtanus goyazius Roewer, 1929, Discocyrtanus oliverioi (H. Soares, 1945) comb. nov., Discocyrtanus pertenuis (Mello-Leitão, 1935) comb. nov. and Discocyrtanus tocantinensis sp. nov.
Distribution. Brazil, states of Goiás, Mato Grosso, Mato Grosso do Sul, Minas Gerais, Paraná, São Paulo and Tocantins. Paraguay, without further locality data (Fig. 4).
description: Published as part of Kury, Adriano B. & Carvalho, Rafael N., 2016, Revalidation of the Brazilian genus Discocyrtanus, with description of two new species (Opiliones: Gonyleptidae: Pachylinae), pp. 126-144 in Zootaxa 4111 (2) on pages 127-128, DOI: 10.11646/zootaxa.4111.2.2, http://zenodo.org/record/263722