Pegasoferae ("winged beast") is a proposed clade of mammals based on genomic research in molecular systematics by Nishihara, Hasegawa and Okada (2006).

According to this, the odd-toed ungulates' closest living relatives are the carnivorans.

Some subsequent molecular studies published shortly afterwards have failed to support it.

[2][3][4] In particular, two recent studies, each combining genome-wide analyses of multiple taxa with testing of competing alternative phylogenetic hypotheses, concluded that Pegasoferae is not a natural grouping.

[5][6] The following cladogram shows the phylogenetic relationships of laurasiatherian mammals following Nishihara et al.