quadricornis, Cottus Linnaeus [C.] 1758:264 [Systema Naturae, Ed. X v. 1; ref. 2787] Baltic Sea. Syntypes: NRM 2491-92 (1, 1). Type catalog: Fernholm & Wheeler 1983:235-236 [ref. 20707] who suggest that the largest syntype would make the best lectotype. •Valid as Triglopsis quadricornis (Linnaeus 1758) -- (Neelov 1979:133 [ref. 3152], Fedorov in Whitehead et al. 1986:1260 [ref. 13677], Kottelat 1997:170 [ref. 22952], Reshetnikov et al. 1997:759 [ref. 24702], Sideleva 1998:154 [ref. 23595], Novikov et al. 2000:161 [ref. 40929], Bogutskaya et al. 2001:46 [ref. 26178], Parin et al. 2002:S89 [ref. 28300], Bogutskaya & Naseka 2004:191 [ref. 28183], Fricke 2007:29 [ref. 30577], Kottelat & Freyhof 2007:519 [ref. 29996], Sideleva et al. 2022:3 [ref. 40100]). •Possibly valid as Megalocottus quadricornis (Linnaeus 1758) -- (Balakirev et al. 2020:11 [ref. 37873]). •Valid as Myoxocephalus quadricornis (Linnaeus 1758) -- (Berg 1949:1128 [ref. 20662], Neelov 1973:597 [ref. 7219], Lee et al. 1980:826 [ref. 22416], Robins & Ray 1986:283 [ref. 23100], Scott & Scott 1988:504 [ref. 25518], McAllister 1990:200 [ref. 14674], Page & Burr 1991:245 [ref. 18983], Scott & Crossman 1998:842 [ref. 24570], Mecklenburg et al. 2002:477 [ref. 25968], Nelson et al. 2004:121 [ref. 27807], Love et al. 2005:90 [ref. 37547], Scharpf 2008:11 [ref. 30399], Møller et al. 2010:52 [ref. 31169], Mecklenburg et al. 2011:123 [ref. 31212], Page & Burr 2011:468 [ref. 31215], Page et al. 2013:124 [ref. 32708], Dolgov 2013:918 [ref. 33112], Parin et al. 2014:263 [ref. 33547], Mecklenburg & Steinke 2015:164 [ref. 34033], Afonso et al. 2016:46, 227 [ref. 36199], Kells et al. 2016:184 [ref. 35888], Mecklenburg et al. 2016:80 [ref. 34440], Mecklenburg et al. 2018:217 [ref. 36370], Love et al. 2021:123 [ref. 39279]). Current status: Valid as Myoxocephalus quadricornis (Linnaeus 1758). Psychrolutidae: Myoxocephalinae. Distribution: Circumpolar in Arctic Ocean, in Pacific and north Atlantic. Habitat: freshwater, brackish, marine.