Скачать или смотреть Science 2: Body Cavity (Coelom) | New Criteria for New System of Classification of Animals

Body cavity (Coelom)
Cavity between the body and internal organs is called as body cavity/coelom. In case of multicellular animals, during initial period
of their embryonic development, body cavity is formed from either mesoderm or gut. Such type of body cavity is present in animals of phylum
Annelida and all phyla coming after Annelida.
Such animals are called as eucoelomate (animals with true body cavity). Body cavity is absent in case of animals from phyla Porifera, Cnidaria and Platyhelminthes. Such animals are called as acoelomate. In case of animals from phylum Aschelminthes, they have body cavity but it is not formed by the above mentioned two ways. Hence those animals are called as
pseudocoelomates.

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