...the name of a genus of flatworms in the family Planariidae of the order Tricladida of the class Turbellaria, or generally the name of a species in the family Planariidae. The Japanese planarian Dugesia japonica (illustration) was once classified as part of the Planaria genus, but was later transferred from the Planaria genus to the Dugesia genus after detailed examination of its reproductive organs, and therefore there are currently no species in the Planaria genus in Japan. All Planarians are freshwater creatures that live on the bottoms of rivers and ponds, or on aquatic plants and stones. From [Flatworms]…Digestive tracts can be rod-shaped or branched. In the past, they were classified based only on the shape of the digestive organs, but recently they have been classified based on the structure of the nervous system, excretory system, and reproductive system. The planarian Dugesia japonica lives under stones in clean ponds and streams, and because of its strong regenerative powers, it has been used as a material for experimental morphology. The planarian Notoplana humilus and many other species are found under stones in the intertidal zone. *Some of the terminology that mentions "Dugesia japonica" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…渦虫綱の三岐腸目プラナリア科の扁形動物の1属名,またはプラナリア科Planariidaeに含まれる種類を一般にこの名でいう。かつて,日本産のナミウズムシDugesia japonica(イラスト)はPlanaria属にされていたが,その後,生殖器官などの精査によってPlanaria属からDugesia属へ移され,したがって日本では現在Planaria属に含まれる種類はいない。 プラナリア科のものはすべて淡水産で,河川や池沼の水底,水生植物や石の上などをはっている。… 【扁形動物】より…消化管には棒状のものや枝状に分岐したものなどがあり,かつては,消化器官の形態だけで分類されていたが,最近では神経系,排出系,生殖系などの構造をもとにして分類されるようになっている。ナミウズムシDugesia japonicaは,きれいな池沼や小川などの石の下などにすみ,再生力が強いところから,実験形態学上の材料に用いられてきた。ウスヒラムシNotoplana humilusほか多くの種類は潮間帯の石の下などに見られる。… ※「Dugesia japonica」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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