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to the study of the evolution of more complex eyes. A parietal eye is also absent in extant hagfish. Hagfish eyespots, when present, can detect light, but as far as it is known, none can resolve detailed images. In Myxine and Neomyxine, the eyes are partly covered by the trunk musculature. Paleontological evidence suggests that the hagfish eye is not plesiomorphic but rather degenerative,

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