Diplogasteria (disputed) Rhabditia (paraphyletic?) Spiruria Tylenchia (disputed) and see text
Secernentea was a class of nematodes in the Classical Phylogeny System (Chitwood, 1958) and is no longer in use.[1][2] This morphological-based classification system has been replaced by the Modern Phylogeny system, where taxonomy assignment is based on small subunit ribosomal DNA (SSU rDNA).[3][4]
Characteristics of Secernentea are:
Subclasses and orders of Secernentea are:[5]
Some families traditionally considered to be Rhabditida seem to be closer to the Tylenchida. If the Tylenchia are to be maintained as separate, they probably will be included therein.
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