Give important characters of phylum Nemathelmintnes.
The important characters of phylum Nemathelmintnes are: - (i) They are commonly known as nematodes or roundworms. (ii) Their body is covered by a cuticle. (iii) Their body is bilaterally symmetrical. (iv) Animals have elongated cylindrical and spindle-shaped bodies with pointed ends. (v) The body cavity is pseudocoelomate (false coelom). (vi) There is no muscle layer in the alimentary canal. (vii) There is no respiratory organ or blood vascular system. (viii) Example – Ascaris, Rhabditis and Ancylostoma.
