32: Animal Diversity and the Evolution of Body Plans
- Page ID
- 73861
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- 32.4: Parazoa- Animals that Lack Specialized Tissues
- The simplest of all the invertebrates are the Parazoans, which include only the phylum Porifera: the sponges. Parazoans (“beside animals”) do not display tissue-level organization, although they do have specialized cells that perform specific functions. Sponge larvae are able to swim; however, adults are non-motile and spend their life attached to a substratum.