Simpsonichthys Carvalho [A. L. de] 1959:2 Masc. Simpsonichthys boitonei Carvalho 1959. Type by original designation (also monotypic). •Synonym of Cynolebias Steindachner 1876 -- (Parenti 1981:490 [ref. 7066], Costa 1989:183 [ref. 14323], Costa 1990:86 [ref. 16650], Costa 1995:33 [ref. 22097]). •Valid as Simpsonichthys Carvalho 1959 -- (Costa et al. 1996:17 [ref. 22219], Costa & Brasil 1996:93 [ref. 22917], Costa 1996:129 [ref. 25271], Costa & Nielsen 2000:7 [ref. 24442], Costa 2000:8 [ref. 25933], Lazara 2001:269 [ref. 25711], Costa et al. 2001:24 [ref. 25934], Costa 2002:917 [ref. 26505], Costa 2003:31 [ref. 26768], Costa et al. 2003:139 [ref. 26946], Costa in Reis et al. 2003:540 [ref. 27061], Costa 2004:2 [ref. 27569], Costa 2004:2 [ref. 27874], Costa & Brasil 2004:1 [ref. 28012], Huber 2005:15 [ref. 28394], Costa 2005:58 [ref. 28575], Costa & Brasil 2006:42 [ref. 28725], Costa 2006:25 [ref. 28771], Costa 2006:16, 17 [ref. 28620] with subgenera, Costa & Brasil 2006:221 [ref. 28843], Costa & Brasil 2007:57 [ref. 29215], Costa 2007:200 [ref. 29338], Costa 2007:7, 25 [ref. 29445], Costa 2008:155 [ref. 29874], Costa & Brasil 2008:245 [ref. 29968], Costa 2009:149 [ref. 30511], Costa 2010:73 [ref. 30777], Nielsen et al. 2010:51 [ref. 30828], Costa 2010:1996 [ref. 30858], Costa & Lima 2010:205 [ref. 31041], Costa 2012:313 [ref. 31750], Costa 2014:25 [ref. 33309], Ponzetto et al. 2016:[2] [ref. 34144] as paraphyletic, Nielsen et al. 2017:165 [ref. 35304], Loureiro et al. 2018:8 [ref. 36240]). Current status: Valid as Simpsonichthys Carvalho 1959. Rivulidae: Cynolebiinae.