| Nematoida | |
|---|---|
 | |
| Paragordius tricuspidatus | |
Scientific classification | |
| Kingdom: | Animalia |
| Subkingdom: | Eumetazoa |
| Clade: | ParaHoxozoa |
| Clade: | Bilateria |
| Clade: | Nephrozoa |
| Clade: | Protostomia |
| Superphylum: | Ecdysozoa |
| Clade: | Nematoida Schmidt-Rhaesa, 1996 |
| Subdivisions | |
| Synonyms | |
| |
Nematoida is aclade ofpseudocoelomate free living or parasiticanimals. It consists of phylaNematoda andNematomorpha.[3][4] The two groups share a number of features in common; the presence of acloaca in both sexes,aflagellate sperm, and acuticle made ofcollagen.[4]
Its position withinEcdysozoa is uncontroversial, but the identity of their closest relatives has been debated. Under theCycloneuralia hypothesis, the nematoids are considered to be closest toScalidophora, named for the ring-shaped brains found in these animals.[5] However, this group has seen less support in phylogenetic analyses, with theCryptovermes hypothesis being more consistently supported,[4][6][7] which groups the nematoids with thepanarthropods, although the issue is still not completely settled.
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