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Lampriformes: No true spines in fins; premaxilla excludes maxilla from gape; unique type of protrusible upper jaw (maxilla, instead of being ligamentously attached to the ethmoid and palatine, slides in and out with the highly protractile premaxilla in at least the first four suborders); pelvic fins with 0-17 rays; swim bladder, when present, physoclistous; orbitosphenoid present in some.

Families in this order: