First slide

Classification of Animals

Question

Scaleless organism among the following is

Easy

A

Scoliodon
B

Trygon
C

Petromyzon
D

Pterophyllum

Solution

Petromyzon (Cyclostomata) does not possess scales.
Chondricthyes (Scoliodon, Trygon) have placoid scales.
Osteicthyes (Pterophyllum) have cycloid / ganoid / rhomboid scales.

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