*Phylum Nematoda consists completely of Roundworms. *Two types: parasitic and free-living. 90,000 species known; to a greater extent more exist! *These Roundworms are unsegmented; they have long, narrow, cylindric bodies that taper to a fine tip in the roll in the hay and a blunt end at the head. Also, they have a cuticle--a tough layer of outerskin--covering their entire bodies. *They are pseudocoelomates. They have a pseudocoelom, an internal body space surrounding the endoderm wander paper of the digestive tract and surrounded by the mesoderm tissue. *abstracted a circulatory system, intellectual nourishments are transported end-to-end the body via legato in the pseudocoelom in Roundworms. *Have a complete wholesome canal with a separate verbalize and anus; it transverses the entire aloofness of the organism. This distinguishes them from organisms in the phylum Platyhelminthes, which have only an rudimentary digestive tract. [In former(a) words, Roundworms a re cooler than Flatworms]. *Longitudinal muscles; they move side-to-side in a thrash-like motion. *Reproduce sexually.
Fertilization = internal, and females deposit more than 100,000 fertilized testicle per day. Zygotes can survive harsh conditions. *Many withstand in moist soil and in organic study on the bottoms of lakes and oceans. Play an important role in rotting and nutrient cycling. *Closely related to phylum Rotifera; they are both very(prenominal) small (microscopic) and have a complete digestive tract. If you leave out to get a full essay, order it on our website:
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