Cercaria

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What Wikipedia says

A cercaria (plural cercariae) is a larval form of the trematode class of parasites. It develops within the germinal cells of the sporocyst or redia. A cercaria has a tapering head with large penetration glands. It may or may not have a long swimming "tail", depending on the species.

Excerpt from the Wikipedia article “Cercaria”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Flukeman, CC BY 3.0, via Wikimedia Commons.