Origin: NL, fr.L. Flagellatus, p. P. See flagellate.
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There are several theories about how metazoas become. Heckel`s theory that first metazoas were Cnidaria and Spongia derived from colonial flagellata is one of two major theories. He said that ontogeny is recapitulation of filogeny based on the examination of embional stages of animals. But ...
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