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[1][2] This morphological-based classification system has been replaced by the Modern Phylogeny system, where taxonomy assignment is based on small subunit ribosomal DNA (SSU rDNA).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] Amphid apertures of Secernenteas are pore or slit-like.

Some Secernenteas have deirids which are located near nerve ring.

Subclasses and orders of Secernentea are:[5] Some families traditionally considered to be Rhabditida seem to be closer to the Tylenchida.