Hydra oligactis

Rarity: Common

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What Wikipedia says

Hydra oligactis, also known as the brown hydra, is a species of hydra found widely dispersed in the northern temperate zone and is also present in the Southern Hemisphere. It is a common organism found in still waters from early Spring to late Autumn.

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

Image: Lifetrance (talk), CC BY-SA 3.0, via Wikimedia Commons.