Do Lampreys Have Eyes

Lampreys, which represent the oldest group of living vertebrates (cyclostomes), show unique eye development. The lamprey larva has only eyespot-like immature eyes beneath a non-transparent skin, whereas after metamorphosis, the adult has well-developed image-forming camera eyes.

Are lampreys blind?

Ammocoetes: Larval lamprey, called ammocoetes, are dark colored on the dorsal surface and light colored on the ventral surface. They are blind and have no teeth and filter feed on planktonic drift.

Do lampreys have brains?

Lampreys have a very small brain, as compared with most gnathostomes, and their telencephalon, in particular, is very tiny. The telencephalic hemispheres arise as an unpaired and solid rudiment, which later divides into two portions (Scott, 1887).