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All living members of the class Cyclostomata are:
Explanation
All living cyclostomes are ectoparasites on marine and freshwater fishes.
Detailed Solution
All living members of class Cyclostomata (e.g., Petromyzon and Myxine) are ectoparasites on fishes, using their circular, suctorial mouth without jaws to attach and feed on host body fluids.