Piscicolidae

Rarity: Common

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At a glance

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What Wikipedia says

The Piscicolidae are a family of jawless leeches in the order Rhynchobdellida that are parasitic on fish. They occur in both freshwater and seawater, have cylindrical bodies, and typically have a large, bell-shaped, anterior sucker with which they cling to their host.

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

Image: Kulmalukko, CC BY-SA 3.0, via Wikimedia Commons.