HardZoologyAnimal Kingdom
+4 / -1
Operculum (gill cover) is absent in:
A
Labeo (Rohu)
B
Catla
C
Scoliodon (Dogfish)
D
Exocoetus (Flying fish)
Explanation
Cartilaginous fishes (Chondrichthyes) lack an operculum, while bony fishes (Osteichthyes) have one.
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