Némathelminthe
The Némathelminthes (usually called " towards ronds") are triploblastic Eumétazoaires Ecdysozoaires Pseudocoelomates, represented almost only by the class of the Nématodes.
Their cœlomic cavity is derived from the Blastocèle. The némathelminthes have a digestive tract simple, rectilinear, including/understanding a mouth (often with hooks), a pharynx, an esophagus, an intestine and a ventral anus (not of digestive glands). Their nervous system is limited to a ring périœsophagien and two nervous cords: ventral and dorsal. They are gonochoric, the female being generally larger than the male, and the male being recognizable with a body of copulation at its posterior end. The round worms are protected by a cuticule (flexible but very resistant made of a substance close to keratin), and their growth is thus done by successive moults. Followers of the cutaneous respiration, they are deprived of systems circulatory and respiratory.
Certain species of némathelminthes are parasitic S, like Ascaris (monoxene), Dracunculus or Onchocerca (heteroxenes).
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