Secernentea
Caenorhabditis elegans
Scientific classification
Kingdom: Animalia Phylum: Nematoda Class: Secernentea
Subclasses
see text

Secernentea are a class of nematodes characterised by numerous caudal papillae and an excretory system possessing lateral canals. Caenorhabditis elegans (ˌsiːnoʊræbˈdaɪtɪs ˈɛlɪgænz is a free-living Nematode (roundworm about 1  mm in length which The nematodes or roundworms ( Phylum Nematoda from Greek (nema "thread" + -ode "like" are one of the most common The nematodes or roundworms ( Phylum Nematoda from Greek (nema "thread" + -ode "like" are one of the most common The excretory system is an organ system that performs the function of Excretion, the bodily process of discharging nitrogeneous wastes They have no circulatory or respiratory system.

Systematics

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

This article is about the taxonomic rank for the sequence of species in a taxonomic list see Taxonomic order In scientific classification used Subclass Rhabditia is mostly comprised of Parasitic Nematodes, though there are some free-living species as well Rhabditida is an order of usually free-living Microbivorous nematodes ( roundworms) living in soil The order Strongylida includes many of the important Nematodes found in the Gastrointestinal tracts of Ruminants Horses and Swine, as well as the Subclass Spiruria is comprised of mostly Parasitic Secernentean Nematodes. The order Ascaridida includes several families of Parasitic Roundworms with three "lips" on the anterior end The Camallanida are an order of Nematodes Parasites of terrestrial and Aquatic vertebrates * Copepods as obligatory Spirurida is an order of Spirurian Nematodes Like all their relatives they have neither a circulatory a or Respiratory system Diplogasterida is an order of Nematodes and the sole order of its subclass Diplogasteria. Diplogasterida is an order of Nematodes and the sole order of its subclass Diplogasteria. Tylenchida is an order of Nematodes List of families Superfamily Criconematoidea Criconematidae Incertae sedis ( Latin for "of uncertain placement" abbreviated "inc

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