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Parazoa
The Parazoa are an ancestral subkingdom of animals, literally translated as "beside the animals". ==Description== Parazoans differ from their choanoflagellate ancestors in that they are not microscopic and have differentiated cells. However, they are an outgroup of the animal phylogenetic tree being that they do not have tissues or organs. The only surviving parazoans are the sponges, which belong to the phylum Porifera, and the Trichoplax in the phylum Placozoa. Parazoa display no body symmetry (are asymmetrical); all other animal groups display some sort of symmetry. There are currently 5000 species, 150 of which are freshwater. Larvae are planktonic and adults are sessile.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Parazoa」の詳細全文を読む
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