3, see text Thelazioidea is a superfamily of spirurian nematodes in the large order Spirurida.

Like all nematodes, they have neither a circulatory nor a respiratory system.

Among the families placed here, only the Rhabdochonidae are notably diverse.

though none is considered to be monotypic Consequently, the Thelazioidea are among the mid-sized superfamilies of Spirurida.

The families of the Thelazioidea are: This Secernentea roundworm- related article is a stub.