Contributions to the taxonomy of some Amazonian Stygnidae (Opiliones Laniatores: Gonyleptoidea) Author Villarreal, Osvaldo Departamento de Invertebrados, Museu Nacional / UFRJ; Quinta da Boa Vista, São Cristóvão, 20.940 - 040, Rio de Janeiro, RJ, BRA- ZIL. & Museo del Instituto de Zoología Agrícola, Facultad de Agronomía, Universidad Central de Venezuela, Maracay, Aragua, VENEZU- ELA. Author Kury, Adriano B. Departamento de Invertebrados, Museu Nacional / UFRJ; Quinta da Boa Vista, São Cristóvão, 20.940 - 040, Rio de Janeiro, RJ, BRA- ZIL. Author Colmenares, Pío A. Division of Invertebrate Zoology, American Museum of Natural History, 79 th St Central Park West, New York, New York, 10024, U. S. A. text Zootaxa 2021 2021-06-10 4984 1 218 227 journal article 4976 10.11646/zootaxa.4984.1.17 b45a302b-7b6a-493d-a63d-d93bcfd5c84e 1175-5326 4926968 05DC27A9-9E01-424E-8F27-1F139E484324 Yapacana Pinto-da-Rocha, 1997 Yapacana Pinto-da-Rocha 1997: 14 . Type-species by original designation: Yapacana tibialis Pinto-da-Rocha, 1997 . Diagnosis. Interocular region unarmed ( Y. tibialis ) or with a high spine. MS-A with 4–5 pair of setae, instead 3–2 as normally present in Stygnidae ; stylus curved, not surpassing the distal border of the LP; MS-E1 reduced and MS-E2 large. Included species. Yapacana tibialis Pinto-da-Rocha, 1997 ; Y. ianomami ( Pinto-da-Rocha & Tourinho, 2012 ) comb. nov. ; Y. neblina ( Pinto-da-Rocha & Tourinho, 2012 ) comb. nov. and Y. tapirapeco ( Pinto-da-Rocha & Tourinho, 2012 ) comb. nov. Remarks. The three species here proposed as new combinations present a genital morphology similar to Yapacana tibialis ( Figs 3J–L ) and not to the Stygnoplus pattern ( Figs 3G–I ). (1) The lamina parva is not reduced and the “neck” is of normal length (not conspicuously short) and not especially narrow ( Figs 3J, L ), (2) MS-C are normally sized ( Figs 3J–L ), (reduced in Stygnoplus ) ( Figs 3G–I ) (3) MS-A 4-5 instead 3 pairs ( Fig. 3K ); (4) MS-E normally present, with at least MS-E2 large ( Figs 3J–L ) (in Stygnoplus , both MS-E1–E2 are extremely reduced or even apparently absent ( Figs 3G–I ). Unlike the type species of the genus, the species here addressed all have a high spine in the carapace in the interocular region.