cycloganoidei

from The Century Dictionary.

• An order of osseous ganoid fishes, with well-developed branchiostegal rays, the bones of the head nearly as in the teleosts, and the scales thin and generally rounded or cycloid. The species are mostly extinct, but one family, Amiidæ, still survives in the fresh waters of North America. See cut under Amiidæ.

from the GNU version of the Collaborative International Dictionary of English.

• noun plural (Zoöl.) An order of ganoid fishes, having cycloid scales. The bowfin (Amia calva) is a living example.