(syn. Ortalis Ϯ Rufous-bellied Chachalaca O. wagleri) Genus Penelope Merrem, 1786, guan; Gr. -οιδης -oidēs resembling; "In the course of recent field work in Sonora, I was surprised to observe that the chachalaca Ortalis wagleri, as compared with other members of the genus, possesses a distinct structural character. In life it bears a very conspicuous, almost cylindrical, tuft of semi-setaceous feathers about 25 millimeters in length, which rises vertically from the extreme anterior forehead or more properly from the base of the culmen. No other member of Ortalis seems to have this character and I therefore propose as a subgeneric name Peneloides new subgenus Type.- Ortalida wagleri G. R. Gray. ... Ortalis wagleri is obviously so closely related to a group otherwise represented only in South America that full generic separation seems inadvisable for the present" (Van Rossem 1942).