quadracus, Gasterosteus Mitchill [S. L.] 1815:430, Pl. 1 [Transactions of the Literary and Philosophical Society of New-York v. 1 (art. 5) (for 1814); ref. 13292] New York, U.S.A. No types known. Misspelled quadratus by Linsley 1844:61 [ref. 17545]. •Valid as Apeltes quadracus (Mitchill 1815) -- (Lee et al. 1980:561 [ref. 22416], Smith 1986:273 [ref. 22186], Robins & Ray 1986:121 [ref. 23100], Scott & Scott 1988:335.4 [ref. 25518], McAllister 1990:215 [ref. 14674], Page & Burr 1991:242 [ref. 18983], Murdy et al. 1997:136 [ref. 23144], Scott & Crossman 1998:658 [ref. 24570], Fuller et al. 1999:332 [ref. 25838], Krueger in Collette & Klein-MacPhee 2002:312 [ref. 26158], Nelson et al. 2004:111 [ref. 27807], Scharpf 2007:34 [ref. 30398], Page & Burr 2011:463 [ref. 31215], Page et al. 2013:113 [32708], Denys et al. 2022:395 [ref. 40085], Simian et al. 2022:375 [ref. 40776]). Current status: Valid as Apeltes quadracus (Mitchill 1815). Gasterosteidae. Distribution: Northwestern Atlantic: eastern Canada and U.S.A.; Saint Pierre et Miquelon (France). Habitat: freshwater, brackish, marine.