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Placozoa

(Infrakingdom)

Overview

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An Infrakingdom in the Kingdom Animalia.

Taxonomy

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The Infrakingdom Placozoa is a member of the Kingdom Animalia. Here is the complete "parentage" of Placozoa:

The Infrakingdom Placozoa is further organized into finer groupings including:

Families

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Trichoplacidae

Trichoplax adhaerens is the only extant representative of phylum Placozoa, which is a basal group of multicellular animals (metazoa). Trichoplax are very flat creatures around a millimeter in diameter, lacking any organs or internal structures. They have two cellular layers: the top epitheloid layer is made of ciliated "cover cells" flattened toward the outside of the organism, and the bottom layer is made up of cylinder cells that possess cilia used in locomotion, and gland cells that lack cilia. Between these layers is the fiber syncytium, a liquid-filled cavity strutted open by star-like fibers. [more]

More info about the Family Trichoplacidae may be found here.

Sources

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Last Revised: August 25, 2014
2014/08/25 12:23:19