Hagfish, lampreys, sharks, and tuna are all chordates that can also be classified into which group?
craniates
vertebrates
cartilaginous fish
cephalocordata

Craniates

Explanation:

Vertebrate animals - representing the subphylum Craniates, as its name implies, are those animals that have as their main characteristic the spine. This structure is responsible for shaping, balancing and protecting the nerve cord.

Vertebrates are a phylum part of chordates, but pay attention, as not every chordate is a vertebrate animal. Vertebrates are fish, amphibians, reptiles, birds and mammals. Hagfish, lamprey, sharks and tuna are an example of chordates that have a spine and can be classified as Craniates.

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