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larva
Larvae of Culex Mosquitoes making dense groups in standing water. Photo by James Gathany.

larva:

The early stage in the development of those insects that change greatly in shape when they become adults. A caterpillar is the larva of a butterfly or moth. Also, the early form of certain other animals that change greatly in shape during their lives. A tadpole is the larva of a frog or toad.