A general term for invertebrates belonging to the phylum Acanthocephala. They parasitize the digestive tracts of vertebrates such as mammals, birds, and fish, and about 1,000 species are known worldwide. Their bodies are long and slender, ranging from as short as 1 mm to over 60 cm. They are divided into anterior and torso, with the anterior body consisting of a snout and neck. Sharp hooks are arranged in a fixed pattern on the surface of the snout, which hooks onto the intestinal wall of the host. The neck is generally short, but in the long-necked hawk moth it is somewhat spirally wound, and in the Japanese hawk moth it is cone-shaped. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
鉤頭動物門Acanthocephalaに属する無脊椎動物の総称。哺乳類,鳥,魚など脊椎動物の消化管に内部寄生し,世界で約1000種ほどが知られている。体は細長く,短いのは1mmほどのものから60cm以上のものまである。体前部と胴部に区分され,体前部は吻(ふん)とくびからなる。吻の表面には鋭い鉤(かぎ)が一定の形に配列していて,これで宿主の腸壁にひっかかっている。くびは一般に短いが,クビナガコウトウチュウでは多少らせん状に巻いており,ニホンタマミコウトウチュウでは円錐状になっている。
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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