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Molgula oculata : ウィキペディア英語版
Molgula oculata

''Molgula oculata'', commonly known as the sea grape, is a species of solitary tunicate in the family Molgulidae. It is native to the north eastern Atlantic Ocean and the North Sea. The specific name ''oculata'' means "tailed" and refers to the larva which has a long tail.
==Description==

''Molgula oculata'' is nearly spherical in shape and is about in diameter. It has a sac-like body with a leathery covering known as its tunic, with two siphons on the upper surface. Water is drawn into the body cavity through a six-lobed oral siphon and expelled through a four-lobed atrial siphon. The oral siphon is surrounded by a ring of branched tentacles, the function of which is to prevent large particles being drawn into the pharynx with the water current. This tunicate is very well camouflaged. It is a sandy brown colour and is partially buried in the sediment on the seabed with the two siphons projecting. Sand grains and shell fragments adhere to its tunic, completely covering the surface apart from a small area in the immediate vicinity of the siphons. This bare patch helps to distinguish it from the closely related ''Molgula occulta'' which is completely coated in particles.

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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