Differentiate between chondrichthyes and osteichthyes

CBSE Class 9
1

Differentiate between chondrichthyes and osteichthyes.

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Characteristics Chondrichthyes Osteichthyes
Endoskeleton Commonly known as cartilaginous fish as they have cartilaginous endoskeleton Commonly known as bony fish as they have bony endoskeleton
Body size Large-sized fish Comparatively smaller in size
Mouth position Ventral Terminal (anterior)
Type of scale present on skin Placoid scales Scales absent, if present, cycloid scales
Number of gills present 5-7 pairs of gills, not covered by operculum 4 pairs of gills, covered by operculum
Caudal fin Heterocercal Homocercal
Excretory waste Urea Ammonia