Potamodrilidae is a family of meiofaunal annelids, monotypically containing only the genus ''Potamodrilus''. Potamodrialidae is the sister group to

Aeolosomatidae The Aeolosomatidae is a family of very small, aquatic annelid worms, between 0.3 and 10 mm in length and 0.04-0.06 mm in diameter. About 30 species have been described in three genera. These worms are known as suction-feeding worms and occupy fr ...

, by all accounts. Beyond that, its

phylogenetic In biology, phylogenetics (; from Greek φυλή/ φῦλον [] "tribe, clan, race", and wikt:γενετικός, γενετικός [] "origin, source, birth") is the study of the evolutionary history and relationships among or within groups o ...

position is uncertain. The species of this genus are found in Europe. Species: * '' Potamodrilus fluviatilus'' (Lastockin, 1935) * '' Potamodrilus rivularis'' Lastočkin, 1935

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