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.

Systematics
Subclasses and orders of Secernentea are:

Subclass Rhabditia Subclass Spiruria Subclass Diplogasteria Subclass Tylenchia Order incertae sedis
 * Rhabditida
 * Strongylida
 * Ascaridida - sometimes placed in Rhabditia
 * Camallanida - sometimes included in Spirurida
 * Drilonematida - sometimes included in Spirurida
 * Spirurida
 * Diplogasterida
 * Aphelenchida
 * Rhigonematida
 * Tylenchida
 * Rhabdiasida

Secernentea Secernentea Secernentea Secernentea Secernentea Secernentea