Question

define osteichthyes in breif.

Answer 1

A class or other category of fishes including the lungfishes and especially formerly the arthrodires and ostracoderms and distinguished from other forms resembling fish by the presence of true bone in their skeleton.

Answer 2

Answer :

Class - Osteichthyes

• It includes both marine and freshwater fishes.
• They have bony endoskeleton.
• Their body is streamlined.
• Their mouth is terminal.
• They four pairs of gills covered with operculum.
• Their skin is covered with cycloid scales.
• Their body has presence of air bladder which regulate the buoyancy of their body.
• Their heart is two chambered.
• They are cold blooded or poikilothermous.
• The sexes are separate.
• The fertilization is external.
• They are oviparous.
• The development is direct.
• Ex : Exocoetus, Labeo, etc.