BIO 2135 Lecture Notes - Lecture 11: Osmoregulation, Epithelium, Gonad
13 Oct 2017
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This is common to organisms who have miniaturized. Pseudocoelomates have coeloms that have mesoderm covering the inside of the ectoderm however, there is no mesoderm lining the gut hence, there is no gut musculature. Hence have to use muscles of the body for digestion. Other phylums have lost their coeloms before but whats different for ecdysozoa is that they are going to replace the coelomic space with either a hemocoel or pseudocoel. Everyone else has an alpha chitin cuticle, but they have a collagenous cuticle. Only have longitudinal muscles and there is no division of the body into spaces hence this will affect how the animals move. Nematodes all look so similar that it is hard to tell one species from another. Have specialized to become micro burrowers and have no idea how many named series are out there. Golden nematode is a large agricultural disease. They can be predators, scavengers, herbivores, carnivores. It has a symmetry based on 3.
