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Ciona savignyi
''Ciona savignyi'' is a marine invertebrate animal sometimes known as the Pacific transparent sea squirt or solitary sea squirt. It is a species of tunicate in the family Cionidae. It is found in shallow waters around Japan and has spread to the west coast of North America where it is regarded as an invasive species.
==Description==
''Ciona savignyi'' is a solitary, bottle or vase-shaped tunicate growing to a length of about . It is usually broader near the base and this part is permanently attached to a hard surface. The outer covering or tunic is soft and gelatinous, translucent, whitish or cream-coloured. The muscle bands and internal organs can often be seen through the tunic. At the narrower, free end, there is a buccal siphon through which water is drawn into the animal. This opening is rimmed by eight yellow-edged lobes each with an orange-red spot. At the side, not far from the buccal siphon, there is an atrial siphon out of which water is pumped. This has six similar yellow lobes with red spots. Five to seven muscle bands run longitudinally along the tunic and the siphons can be retracted when danger threatens.〔 This species can be mistaken for the very similar ''Ciona intestinalis'' but ''Ciona savignyi'' has white flecks in the tunic wall which ''C. intestinalis'' lacks. Nor does ''C. intestinalis'' have any reddish colour associated with its buccal siphon.〔
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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