Scales, Enamel, Cosmine, Ganoine, and Early Osteichthyans - ScienceDirect
These are dermal scales of fish. Match them with their names and choose the correct option from the following.(i) Placoid, (ii) Cycloid, (iii) Ctenoid, (iv) Ganoid
Cycloid and Ctenoid Scales - The Australian Museum
File:NIE 1905 Fish - scales.jpg - Wikimedia Commons