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.