Cycloneuralia is a proposed clade of ecdysozoan animals including the Scalidophora (Kinorhynchans, Loriciferans, Priapulids), the Nematoida (nematodes, Nematomorphs), and the extinct Palaeoscolecida.

[1][2] It may be paraphyletic, or may be a sister group to Panarthropoda.

Or perhaps Panarthropoda is paraphyletic with respect to Cycloneuralia.

[3] The group has also been considered a single phylum, sometimes given the old name Nemathelminthes.

[4] The uniting character is the nervous system organization with a circumpharyngeal brain and somata–neuropil–somata pattern.