Integumentary System ☺
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Annelida
Porifera
Cnidaria
Mollusca
Platyhelminthes
Nematoda
Arthropoda
Echinodermata
Chordata
nemotada
Animals in the Nemotada Phylum have a single layer of cells for the epidermis, the outermost layer of skin. There is a cuticle of cartilage that helps provide structure. All of this is above the muscle cells.