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Papula




Papulae (sing. papula), also known as dermal branchiae or skin gills, are projections of the coelom of Asteroidea that serve in respiration and waste removal. Papulae are soft, covered externally with the epidermis, and lined internally with peritoneum. They extend through the mesodermal ossicles, and are protected from microscopic larvae by pedicellariae.

 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Papula". A list of authors is available in Wikipedia.
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