Secernentea

Secernentea are a class of nematodes characterised by numerous caudal papillae and an excretory system possessing lateral canals. They have no circulatory or respiratory system.

Subclasses and orders of Secernentea are:

Subclass Rhabditia

• Rhabditida
• Strongylida

Subclass Spiruria

• Ascaridida – sometimes placed in Rhabditia
• Camallanida – sometimes included in Spirurida
• Drilonematida – sometimes included in Spirurida
• Spirurida

Subclass Diplogasteria

• Diplogasterida

Subclass Tylenchia

• Aphelenchida
• Rhigonematida
• Tylenchida

Order incertae sedis

• Rhabdiasida

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