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Schistosome larvae

Hundreds of parasitic worm larvae incubate inside a snail.

A cross section of a snail tentacle that harbours a parasitic flatworm called schistosome.
A cross section of a snail tentacle that harbours a parasitic flatworm called schistosome. Credit: Bo Wang and Phillip A. Newmark, University of Illinios at Urbana-Champaign