Xenurolebias (subgenus of Simpsonichthys) Costa [W. J. E. M.] 2006:16 Masc. Simpsonichthys myersi Carvalho 1971. Type by original designation. •Synonym of Simpsonichthys Carvalho 1959 but a valid subgenus Xenurolebias as described -- (Costa 2007:7 [ref. 29445], Costa 2010:1997 [ref. 30858], Costa 2014:25 [ref. 33309]). •Valid as Xenurolebias Costa 2006 -- (Costa & Amorim 2014:350 [ref. 33343], Ponzetto et al. 2016:[7] [ref. 34144], Loureiro et al. 2018:8 [ref. 36240]). Current status: Valid as Xenurolebias Costa 2006. Rivulidae: Cynolebiinae.