All of the following are characteristics of Chondrichthyes EXCEPT
Correct answer: D. operculum over gills
- A. heterocercal tail
- B. 5-7 pairs of gills
- C. cartilaginous endoskeleton
- D. operculum over gills
Explanation
Chondrichthyes do not possess an operculum over their gills like bony fish (Osteichthyes) do. Instead, their gills are exposed directly to the water, often through multiple slits on the sides of their bodies. These gill slits are supported by cartilaginous structures rather than bony opercula.
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