ヤツメウナギ 八目鰻
Primitive jawless [[fish]], lampreys have been both food item and pest since ancient times. This eel-like aquatic animal has a disk-shaped mouth full of teeth and gill pores instead of slits; a single nostril is situated on top of its head.

h4. External links

* Wikipedia: "Lamprey":http://en.wikipedia.org/wiki/Lamprey
lamprey