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thestructureoftheirwheelapparatus:thetrochusandthecinguluminthePseu-
dotrochaarefusedatthebase,notrochus-cingulumfusionbeingevidentin
theGnesiotrocha.InDeBeauchamp’ssystem,lowertaxaoccupypositionssim-
ilartothoseinthesystemproposedbyKUTIKOVA(1970).Shebasedtherotifer
taxonomyonfunctionandmorphologyofthewheelapparatus,anorganthat
simultaneouslyservestwoimportantfunctions:locomotionandfeeding;itisalso
aqualitativelyimportantlinkintheevolutionofthemicroinvertebratesdiscussed.
Sheusedthewheelapparatusfunction-morphologyasthecriterionofthefollow-
ingsystematicdivisionofrotifers(downto,andinclusiveof,thefamilylevel).
Class:Rotatoria
Subclass:Eurotatoria
Superorder:Pseudotrocha
Order:Ploimida
Family:Notommatidae
Trichocercidae
Gastropodidae
Synchaetidae
Lindiidae
Dicranophoridae
Asplanchnidae
Microcodidae
Lecanidae
Proalidae
Epiphanidae
Trichotridae
Mytilinidae
Colurellidae
Euchlanidae
Brachionidae
Superorder:Gnesiotrocha
Order:Monimotrocha
Family:Flosculariidae
Conochilidae
Testudinellidae
Filinidae
Hexarthridae
Trochosphaeridae
Order:Paedotrochida
Family:Collothecidae
Atrochidae
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