Yapacana, Pinto-da-Rocha, 1997

Villarreal, Osvaldo, Kury, Adriano B. & Colmenares, Pío A., 2021, Contributions to the taxonomy of some Amazonian Stygnidae (Opiliones Laniatores: Gonyleptoidea), Zootaxa 4984 (1), pp. 218-227 : 223

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.

Figures

FIGURES 3A–L. Apical portion of the penis, showing the penial chaetotaxy in Jime (A–F), Stygnoplus (G–I) and Yapacana (J–L): A–C J. praecursor spec. nov. (holotype). D–F J. chifrudo (adapted from Pinto-da-Rocha & Tourinho 2012). G–I S. lomion (adapted from Villarreal-M & Rodríguez 2004). J–K Y. tibialis (adapted from Pinto-da-Rocha 1997). L Y. neblina (adapted from Pinto-da-Rocha & Tourinho 2012). MS—macrosteae.