Phaeostrymon Clench, 1961 is a junior subjective synonym of Satyrium Scudder, 1876

Phaeostrymon Clench, 1961 (type and the only species Thecla alcestis W. H. Edwards, 1871) was previously considered a valid genus, but it originates within Satyrium Scudder, 1876 (type species Lycaena fuliginosa W. H. Edwards, 1861), thus rendering Satyrium paraphyletic (Fig. 4). Because Satyrium is a tight (but diverse) group of close relatives prominently separated from other genera (Fig. 4), Phaeostrymon is a close sister to the clade with the type species of Satyrium, and Phaeostrymon is not prominently distinct from this clade, it is best to treat Phaeostrymon as a junior subjective synonym of Satyrium, new status.