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Macrostomum
''Macrostomum'' is a genus of Platyhelminthes with worldwide distribution,〔〔 with over a hundred species described.〔 These hermaphroditic, free-living flatworms are small in size, with large species reaching only about 5 mm (e.g. ''Macrostomum tuba''). They are usually transparent, and the smaller species appear rather round than flat.
== Name ==
The term "''Macrostomum''", meaning "big-mouthed", derives from the Greek μάκρος ''makros'', "large", and στόμα, ''stoma'', mouth. Relative to other turbellaria, ''Macrostomum'' species have indeed a long mouth, connected to the gut by a muscular pharynx which can expand, in certain species, to almost the width of the animal.
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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