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Assignment 3: Class Myxini Why are hagfishes (no vertebrae) and lamprey (rudimentary vertebrae) included in the subphylum Ver

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1.Hagfish are considered as vertebrae because even they do not have backbone but they share many traits with lamprey like absence of jaw, have well-developed sensory system. Lamprey are considered as vertebrae because they have rudimentary vertebrae and other vertebrae characterstics.

- Hagfish Loss of Backbone Lampreys Backbone Jawed Fish Vertebrates Amphibians Reptiles & Birds Time Mammals

2. Two morphological differences are:

I. Lamprey brain is more developed than Hagfish.

II. Lamprey have hornlike teeth whereas Hagfish do not have.

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