Sea louse

Rarity: Common

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At a glance

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What Wikipedia says

Sea lice (singular: sea louse) are copepods (small crustaceans) of the family Caligidae within the order Siphonostomatoida. They are marine ectoparasites (external parasites) that feed on the mucus, epidermal tissue, and blood of host fish.

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

Image: 7Barrym0re, Public domain, via Wikimedia Commons.