The suborder Ascaridina contains the bulk of the

Ascaridida The order Ascaridida includes several families of parasitic roundworms with three "lips" on the anterior end. They were formerly placed in the subclass Rhabditia by some, but morphological and DNA sequence data rather unequivocally assign them t ...

parasitic Parasitism is a close relationship between species, where one organism, the parasite, lives on or inside another organism, the host, causing it some harm, and is adapted structurally to this way of life. The entomologist E. O. Wilson ha ...

roundworms The nematodes ( or grc-gre, Νηματώδη; la, Nematoda) or roundworms constitute the phylum Nematoda (also called Nemathelminthes), with plant-parasitic nematodes also known as eelworms. They are a diverse animal phylum inhabiting a broa ...

with three "lips" on the anterior end. The Ascaridida were formerly placed in the subclass

Rhabditia Subclass Rhabditia is mostly composed of parasitic nematodes (particularly in the Strongylida), though there are some free-living species as well (particularly in the Rhabditida). Phasmids (posterior sensory structures) are well-developed, whil ...

by some, but morphological and DNA sequence data rather unequivocally assigns them to the

Spiruria Subclass Spiruria comprises mostly parasitic secernentean nematodes. In an alternate classification, they are treated as suborder Spirurina, with the orders listed here being ranked as infraorders. The Ascaridida and the Oxyurida, which include ...

. The

Oxyurida Oxyurida is an order of nematode worms of the class Secernentea. It consists of four families, one of which contains the human pinworm (''Enterobius vermicularis''). Species Notable species include: * ''Enterobius vermicularis'', the human ...

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 ''Ascaris'' is a genus of parasitic nematode worms known as the "small intestinal roundworms", which is a type of parasitic worm. One species, '' Ascaris lumbricoides'', affects humans and causes the disease ascariasis. Another species, ''Asc ...

'' as such a treatment would place them. These "

worm Worms are many different distantly related bilateral animals that typically have a long cylindrical tube-like body, no limbs, and no eyes (though not always). Worms vary in size from microscopic to over in length for marine polychaete wo ...

s" contain a number of important

parasite Parasitism is a close relationship between species, where one organism, the parasite, lives on or inside another organism, the host, causing it some harm, and is adapted structurally to this way of life. The entomologist E. O. Wilson has ...

s of humans and

domestic animal This page gives a list of domesticated animals, also including a list of domestication of animals, animals which are or may be currently undergoing the process of domestication and animals that have an extensive relationship with humans beyond simp ...

s, namely in the superfamily Ascaridoidea.

Systematics

The Ascaridina contain the following superfamilies and

families Family (from la, familia) is a group of people related either by consanguinity (by recognized birth) or affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its members and of society. Ideal ...

:ToL (2002), SN2K (2008)

Superfamily Ascaridoidea * Acanthocheilidae *

Anisakidae The Anisakidae are a family of intestinal nematodes (roundworms). The larvae of these worms can cause anisakiasis when ingested by humans, in raw or insufficiently cooked fish. Anisakidae worms can infect many species of fish, birds, mammals and ...

Ascarididae The Ascarididae are a family of the large intestinal nematoda, roundworms. Members of the family are intestinal parasites, infecting all class (biology), classes of vertebrates. It includes a number of genus, genera,Anderson RC (2000)''Nematode Pa ...

* Crossophoridae * Goeziidae * Raphidascarididae (disputed) * Toxocaridae Superfamily Cosmocercoidea * Atractidae * Cosmocercidae * Kathlaniidae Superfamily Heterakoidea * Ascaridiidae * Aspidoderidae (disputed) * Heterakidae Superfamily Seuratoidea * Chitwoodchabaudiidae (disputed) * Cucullanidae *

Quimperiidae Quimperiidae is a family of nematodes belonging to the order Rhabditida Rhabditida is an order of free-living, zooparasitic, and phytoparasitic microbivorous nematodes living in soil. The Cephalobidae, Panagrolaimidae, Steinernematidae, an ...

* Schneidernematidae * Seuratidae Superfamily Subuluroidea * Maupasinidae * Subuluridae

Footnotes

References

* (2008)
Suborder Ascaridina
Version of 2008-AUG-14. Retrieved 2008-NOV-05. * (2002)
Nematoda
Version of 2002-JAN-01. Retrieved 2008-NOV-02. Ascaridida Protostome suborders {{parasitic animal-stub