3-710: 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. This morphological-based classification system has been replaced by the Modern Phylogeny system, where taxonomy assignment is based on small subunit ribosomal DNA (SSU rDNA). Characteristics of Secernentea are: Subclasses and orders of Secernentea are: Some families traditionally considered to be Rhabditida seem to be closer to
6-542: The Tylenchida. If the Tylenchia are to be maintained as separate, they probably will be included therein. This Secernentea roundworm- related article is a stub . You can help Misplaced Pages by expanding it . Diplogasteria Diplogasterida was an order of nematodes . It was sometimes placed in a monotypic subclass Diplogasteria , but molecular phylogenetic evidence has shown it to be embedded in
9-434: The family Rhabditidae (formerly Rhabditina ). The confusion of having a hierarchical nesting of groups that were formerly mutually exclusive has led to a profusion of names. Although completely revised taxonomy of nematodes that builds on recent classification systems as well as recent phylogenetic evidence is still necessary, most contemporary taxonomic studies now treat all groups listed under "Diplogasterina" below as
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