Plants and Animals

What are ammocetes?

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. The larvae, called ammocoetes, are about 1/4 in. (6 mm) long. They are transparent, eyeless filter-feeders and live in muddy river bottoms, eating particles of organic matter. Ammocoetes are used in zoology courses to demonstrate a theoretically primitive vertebrate construction. At about five years of age they metamorphose into the adult, parasitic form. In some species the adult does not feed and remains the size of the larva.

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