Pouch animal - Aschelminthes

Japanese: 袋形動物 - たいけいどうぶつ（英語表記）Aschelminthes

Also called "saccadic animals." A general term for species belonging to the phylum Psaccademia, including nematodes, rotifers, acanthocephala, gastrotrichum, kinorhyncha, and priapularia. Their bodies are cylindrical, bottle-shaped, or thread-like, and their surface is covered with cuticle. In general, the pharynx is well developed, but in parasitic species, some digestive organs are partially or completely degenerated. In the nervous system, many have a brain, ventral nerves, and lateral nerves. They have no circulatory or respiratory systems. They are generally dioecious, and some species exhibit heterogony in their life cycle. They are widely distributed in the ocean, freshwater, and on land, and many are parasitic. Parasitic species are mainly parasitic on arthropods and vertebrates, but there are also many that parasitize plants.

Pouch animal

Please see the "Pouchworm" page.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

「ふくろがたどうぶつ」ともいう。袋形動物門に属する種類の総称で，線虫類，線形虫類，輪虫類，鉤頭虫類，腹毛類，動吻類，プリアプルス類などが含まれる。体は円筒状，徳利形，糸状などで，体表はクチクラでおおわれる。一般に咽頭がよく発達するが，寄生性のものでは消化器の一部あるいは全部が退化しているものがある。神経系では脳，腹側神経，体側神経をもつものが多い。循環器系および呼吸器系はない。一般に雌雄異体で，生活史のなかでヘテロゴニーをするものもある。海洋，淡水，陸上と分布は広く，寄生するものも多い。寄生性のものはおもに節足動物，脊椎動物の体内に寄生することが多いが，植物に寄生するものも少くない。