Biologist first classified kamptozoa as bryozoans, however when it was discovered kamptozoa are acoelomate they were reclassified. At present they are thought to be trochozoans. Many biologists believe that the similarities between bryozoa and kamptozoa are convergent adaptations for sessile filter feeding by small animals. This conclusion is supported by the absence of a coelom, the location of the anus within the crown of tentacles and spiral cleavage, none of which are true for bryozoans. There are no obvious affinities between kamptozoa and other taxon except possibly the cycliophora which is thought to be its sister-taxon.
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