What is the difference between the epidermis of a nematode and that of an annelid? How does a nematode differ from an annelid with reference to the musculature of the body wall?
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Nematode: epidermis of nematodes surrounds the pseudocoelom. The epidermis may be syncytial, and its nuclear usually in the four epidermal cords that project inward. The longitudinal muscles are the principal means of the locomotion, contraction of these muscles results in undulatory waves. Circulatory muscles are absent so cannot crawl.
Annelid: the epidermis of annelid consists of single layer of columnar cells that secrete a protective, non-living cuticle. These are capable of walking, crawling and swimming. To do so, longitudinal muscles on one side of body act antagonistically to the muscles on other side.
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