Ciderius
| Ciderius Temporal range: Wenlock, ~ | |
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| Life reconstruction of C. cooperi | |
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| Genus: | †Ciderius van der Brugghen, 2015 |
| Type species | |
| †Ciderius cooperi van der Brugghen, 2015 | |
Ciderius is an extinct genus of jawless fish from the family Euphaneropidae, being the oldest known member of the family. It is known from the Lower Silurian Fish Bed Formation of Scotland, and the genus name is derived from cider, due to its resemblance to a bottle, a barrel and a pair of apples when flattened.