Acuariidae is a family of spirurian nematodes. Like all nematodes, they have neither a circulatory nor a respiratory system. They are the only family in superfamily Acuarioidea, and number about 40 genera and 300 species, most of which are parasites of birds.[1]
Several genera, particularly in the Seuratiinae, are monotypic.[1] At least some of them are liable to be invalid.