Plectognathi
Plectognathi , noun, plural
[New Latin, from Greek {not transcribed} twisted (from {not transcribed} to plait, twist) + {not transcribed} jaw.]
(Zoology) An order of fishes generally having the maxillary bone united with the premaxillary, and the articular united with the dentary.
The upper jaw is immovably joined to the skull; the ventral fins are rudimentary or wanting; and the body is covered with bony plates, spines, or small rough ossicles, like shagreen. The order includes the diodons, filefishes, globefishes, and trunkfishes.