OSTEICHTHYES- 5. ORDER BELONIFORMES

Scales cycloid.
Pectoral fins large.
e.g
exocoetus ,cypselurus(flying fish)belone(garfish),hemirhamphus(half beak),belone(garfish).
ORDER 6. SYNGNATHIFORMES OR SOLENICHTHYES
Protective scales on body.
snout tubular with suctorial mouth.
swim bladder closed.
e.g hippocampus(sea horse),syngnathus(pipe fish),fistularia(flute fish)
ORDER 7.OPHIOCEPHALIFORMES OR CHANNIFORMES
Head depressed with plate-like scales.
Air bladder long and without duct.
Accessory respiratory organs present.
e.g ophiocephalus or channa.
ORDER 8. SYMBRANCHIFORMES
Body elongated,e,g eel.
Gill slits join to form ventral slit.
Paired fins,air bladder lacking.
e.g amphipnous,symbranchus(eels).
ORDER 9. MASTACEMBELIFORMES
Body eel-like.
nostrils on tubular tentacles at end of snout. e,g mastacembelus,macrognathus.
ORDER 10.PERCIFORMESOR PERCOMORPHI
Fin spines present.
Dorsal fins weberian apparatus absent.
Air bladder with out duct.e,g lates(bhetki)