Question

difference between placoid and cycloid scales?

Answer 1

Hey there!!!
♦ Placoid scales are found in cartilaginous species and can be dermal or mesodermal in origin.
They are hard and tough.


♦ Cycloid scales are the bony scales found in bony fishes and are always mesodermal in origin.
They are comparatively flexible.


hope it helps..

Answer 2

Difference between placoid and cycloid scales:

Placoid Scales:

• Placoid scales as the name suggests refers to tiny, sharp teeth like structures and thus are present in fishes like sharks, rays, etc.

• They are also called dermal denticles because they form in the dermis layer.

• It gives the fish a scale-like appearance on their body.

• They are little hard and tough.

Cycloid scales:

• Cycloid scales have no sharp and pointed structures.

• They have a smooth appearance like a cycle as derived from their name.

• Such scales are present in fishes like salmon and carp.
• It also provide a scale-like appearance.

• When compared to cycloid it was comparatively flexible.

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