plectospondyli

from The Century Dictionary.

• An order of fishes having a precoracoid arch, a symplectic but no coronoid bones, and the anterior vertebræ coössified and connected with the auditory apparatus by a chain of little bones. It contains the cyprinids, characinids, and gymnonotous fishes—all of fresh water.

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

• noun plural (Zoöl.) An extensive suborder of fresh-water physostomous fishes having the anterior vertebræ united and much modified; the Eventognathi.