chondroganoidea

from The Century Dictionary.

• In Gill's system of classification, a division or superorder of ganoid fishes, containing those which have a cartilaginous skeleton, such as the sturgeons and many fossil forms. The living representatives are referable to the orders Chondrostei and Selachostomi.

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

• noun (Zoöl.) An order of ganoid fishes, including the sturgeons; -- so called on account of their cartilaginous skeleton.