Troyus fantasos (Cramer, 1780), Troyus onaca (Evans, 1955), Troyus aurelius (Plötz, 1882), Troyus marcus (Fabricius, 1787), Troyus diversa (Herrich-Schäffer, 1869), and Troyus drova (Evans, 1955), new combinations Previously placed in the genus Vettius Godman, 1901 (type species Papilio phyllus Cramer, 1777), Papilio fantasos Cramer, 1780 is not monophyletic with Vettius type species, and is a close relative of the monotypic genus Troyus A. Warren & Turland, 2012 (type and the only included species Troyus turneri A. Warren & Turland, 2012). Their sister genus is Monca Evans, 1955 (type species Cobalus telata Herrich-Schäffer, 1869) (Fig. 13). Therefore, we establish a new combination Troyus fantasos. Due to genetic and morphological similarities, we additionally propose the following new combinations: Troyus onaca (Evans, 1955), Troyus aurelius (Plötz, 1882), Troyus marcus (Fabricius, 1787), Troyus diversa (HerrichSchäffer, 1869), and Troyus drova (Evans, 1955). All these species were in Vettius before.

Published as part of Zhang, Jing, Cong, Qian, Shen, Jinhui, Opler, Paul A. & Grishin, Nick V., 2019, Changes to North American butterfly names, pp. 1-12 in The Taxonomic Report of the International Lepidoptera Survey 8 (2) on page 8, DOI: 10.5281/zenodo.16422375