[Note: in recent years Seifert (Seifert, 1994a, Seifert, 1996b, Seifert, 2007, Seifert, 2018) has made repeated attempts to resurrect Symbiomyrma, either as a subgenus of Myrmica, or as a separate genus. This is considered an unproductive exercise, and in this catalogue Symbiomyrma remains as a junior synonym, in accord with majority opinion.]