OSTEICHTHYES-HOLOSTEI

Mouth opening small.
Ganoid or cycloid scales.
Tail fin heterocercal.
Ray-finned fish, transitinal between CHONDROSTEI AND TELEOSTEI.
ORDER 1. AMIIFORMES
Thin, overlapping cycloid scales.
Snout normal ,rounded.
Long dorsal fin.
e.g AMIA(BOWFIN)
ORDER 2. SEMIONOTIFORMES
Scales rhomboidal ganoid in oblique rows.
Snout and body elongated. e.g Lepidosteus or lepisosteus(garpike)