In which of the following groups the operculum is present?

Polypterus

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Hippocampus

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Holocephali

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Teleostomi

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Both C and D

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Solution

The correct option is A Teleostomi
The operculum is a bony flap covering the gills in bony fishes or telosts. It regulates the direction of water flow over the gills. It is not found in cartilage fishes. Elasmobranchs do not have an operculum as it is the cartilaginous fish but there are separate gill slits for each gill.
Therefore, the correct answer is option D.

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