Pristininae Lastočkin, 1921, often included in Naidinae.Tubificinae Eisen, 1879, containing (among others) the genus Tubifex.The family Naididae is divided into six subfamilies, arranged here in the presumed phylogenetic sequence: A proposal to the International Commission on Zoological Nomenclature to suppress Naididae, because the "tubificids" are the more well-known group of the two, was rejected. To avoid paraphyly the naidid and tubificid taxa were included in a combined family, which took the name Naididae because it has priority under International Code of Zoological Nomenclature rules as the senior synonym of Tubificidae. Taxonomy Īnalysis of 18S rDNA sequences revealed that the tradition family Tubificidae is not monophyletic, with the traditionally circumscribed Naididae nested within tubificid taxa. They are all hermaphroditic and lack a larval stage. These worms can vary in size, from centimeters to millimeters, depending on the subfamily. In freshwater aquaria they may be referred to as detritus worms. They are key components of the benthic communities of many freshwater and marine ecosystems. The Naididae (including the former family Tubificidae) are a family of clitellate oligochaete worms like the sludge worm, Tubifex tubifex.
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