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Polyclinum planum
''Polyclinum planum'', is a compound ascidian commonly known as the Elephant Ear Tunicate. It is an ascidian tunicate in the family Polyclinidae. Ascidians are also known as sea squirts.
==Description==
''Polyclinum planum'' colonies are variable in color ranging from olive greenish to brown to yellowish tan. Colonies of this species have a tough flexible peduncle located along one margin of the zooid-bearing lobe by which they are attached to a hard substrate. The pharynx of each zooid (colony member) has 13-17 rows of stigmata (ciliated openings) that they use for filter-feeding.〔 The zooid-bearing lobe is roughly spherical in colonies less than 1 or 2 cm in diameter, the lobe becomes laterally compressed into sort of a tongue or pancake shape as the colony increases in size, and the lobe can be 2.5 to more than 10 times wider than it is thick. Each zooid in the colony maintains its own oral siphon (incurrent opening) while the cloacal siphon (excurrent opening) empties into a pocket-like cloacal opening that is shared by multiple zooids.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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