Ascaridina

The suborder Ascaridina contains the bulk of the Ascaridida, parasitic roundworms with three "lips" on the anterior end. The Ascaridida were formerly placed in the subclass Rhabditia by some, but morphological and DNA sequence data rather unequivocally assigns them to the Spiruria. The Oxyurida and Rhigonematida are occasionally placed in the Ascaridina as superfamily Oxyuroidea, but while they seem indeed to be Spiruria, they are not as close to Ascaris as such a treatment would place them.^[1]

Ascaridina
Adult Toxocara canis (Ascaridoidea: Toxocaridae)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Nematoda
Class:	Chromadorea
Order:	Ascaridida
Suborder:	Ascaridina
Superfamilies
5, see text

These "worms" contain a number of important parasites of humans and domestic animals, namely in the superfamily Ascaridoidea.

Some paleoparasitological studies have described groups belonging to Ascaridina infecting fish, reptiles, and mammals in the Mesozoic.^[2]

Systematics

The Ascaridina contain the following superfamilies and families:^[3]

Superfamily Ascaridoidea Acanthocheilidae Anisakidae Ascarididae Crossophoridae Goeziidae Raphidascarididae (disputed) Toxocaridae Superfamily Cosmocercoidea Atractidae Cosmocercidae Kathlaniidae Superfamily Heterakoidea Ascaridiidae Aspidoderidae (disputed) Heterakidae

Superfamily Seuratoidea Chitwoodchabaudiidae (disputed) Cucullanidae Quimperiidae Schneidernematidae Seuratidae Superfamily Subuluroidea Maupasinidae Subuluridae