Paradiscocyrtus Mello-Leitão, 1927

Carvalho, Rafael N. & Kury, Adriano B., 2022, Review of Paradiscocyrtus Mello-Leitão, 1927 (Gonyleptidae, Opiliones), with the transfer of Paradiscocyrtus cerayanus Roewer, 1929 to Discocyrtus Holmberg, 1878 and a new interpretation of its type locality, Zoosystema 44 (9), pp. 209-225 : 215-217

Genus Paradiscocyrtus Mello-Leitão, 1927

Paradiscocyrtus Mello-Leitão, 1927: 15 ; 1932: 205; 1935: 100. — Roewer 1929: 246. — Soares & Soares 1954: 286. — Kury 2003: 185. — Carvalho 2018: 190.

INCLUDED SPECIES. — Paradiscocyrtus neglectus Mello-Leitão, 1927 – type species by original designation.

DIAGNOSIS. — Stylus of glans slightly dorsally convex ( Fig. 4A ) (sinuous in B. orientalis ; almost straight in Discocyrtus s. str. ( Fig. 4B )). Ocularium with pair of spines almost forming a right angle concerning the basis ( Fig. 4C ) (forming an acute angle concerning the basis in B. orientalis and Discocyrtus s. str. ( Fig. 4D )). DS gamma form ( Fig. 4E ) (gamma-pyriform form in B. orientalis and Discocyrtus s. str. ( Fig. 4F )). Area III paramedian armature with a pair of phalanx-shaped spines ( Fig. 4E ) (a pair of dome-shaped tubercles in B. orientalis and Discocyrtus s. str. ( Fig. 4F )). Area IV posterior groove invading the DS posterior border medially ( Fig. 4E ) (absent in B. orientalis and Discocyrtus s. str. ( Fig. 4F )). Cx IV retrolateral apophysis with the same length as the prolateral, without a secondary branch ( Fig. 4E ) (tiny and with a second branch in B. orientalis and Discocyrtus s. str. ( Fig. 4F )). Tr IV with a pair of prolateral medial apophyses ( Fig. 4E ) (absent in B. orientalis and Discocyrtus s. str. ( Fig. 4F )).

DISTRIBUTION. — Brazil, states of Minas Gerais and Rio de Janeiro ( Fig. 5 ).

Figures

FIG. 4. — Diagnostic character states of Paradiscocyrtus Mello-Leitão, 1927 (A, C, E) in contrast to Discocyrtus s. str. (B, D, F): A, B, stylus of glans (yellow); C, D, ocularium pair of spines (green); E, F, DS shape (gray), area III armature (blue), comparative shape between area IV posterior and DS posterior borders (red), Cx IV retrolateral apophysis (black); Tr IV prolateral medial apophysis (magenta, absent in Discocyrtus s. str.). Scale bars: A, B, 50 μm; C, D, E, F, 1 mm.

FIG. 5. — Brazil, showing distribution of Discocyrtus cerayanus (Roewer, 1929) n. comb. and Paradiscocyrtus neglectus Mello-Leitão, 1927. In the main map: 1) shaded areas in the background represent the regionalization (“Provinces”) of the Neotropics (Morrone 2014); 2) the red-checkered area shows the Brazilian state of Ceará, misinterpreted by Mello-Leitão (in Roewer 1931) as the real meaning of “Ceraya” (type locality of D. cerayanus n. comb.) recorded by Roewer (1929). Here, “Ceraya” is interpreted as “Serra do Caraça”, a mountain range from the Minas Gerais state. The inset shows the areas of endemism of the Brazilian Atlantic Rain Forest used here follow the concept exposed by DaSilva et al. (2017).