ambigua, Datnia Richardson [J.] 1845:25, Pl. 19 [Ichthyology of the voyage of H. M. S. Erebus & Terror v. 2 (2); ref. 3740] Western Australia [possibly in error]. Syntypes: BMNH 1844.9.3.8-9 (3, stuffed). Originally as Datnia? ambigua. •Valid as Macquaria ambigua (Richardson 1845) -- (MacDonald 1978:693 [ref. 28746], Cadwallader & Backhouse 1983:108 [ref. 25473], Paxton et al. 1989:512 [ref. 12442], Musyl & Keenan 1992:1598 [ref. 21991], Harris & Rowland in McDowall 1996:150 [ref. 22909], Pusey & Kennard 2001:22 [ref. 25401], Unmack 2001:1062 [ref. 25797], Hutchins 2001:29 [ref. 25847], Allen et al. 2002:199 [ref. 25930], Paxton et al. 2006:1043 [ref. 28995]). •Valid as Macquaria ambigua (Richardson 1845), subspecies ambigua -- (Hammer & Walker 2004:88 [ref. 28129], Hammer et al. 2012:64 [ref. 32389], Larson et al. 2013:103 [ref. 32988], Kuiter 2018:58 [ref. 36369]). Current status: Valid as Macquaria ambigua (Richardson 1845). Percichthyidae. Distribution: Australia, introduced elsewhere. Habitat: freshwater.