Hydrus (Latin for Hydra, also referred to as "male Hydra" or "little Hydra") is a minor southern constellation. It was introduced by Johann Bayer in 1603. It should not be confused with Hydra.
Mythology
Since it was introduced in the 17th century, and due to its southern position is not visible from Greece, there is no earlier mythology associated with Hydrus, despite its name.
