An insect belonging to the order Siphonaptera (Crypoptera) and family Pseudocidae. Males are about 2 mm long and females about 3 mm long, and they are found all over the world, but are not very common in the tropical regions of Africa and Asia. They mainly parasitize dogs, but also cats, weasels, foxes, and other carnivorous animals. They resemble human fleas, but are easily distinguished by the rows of sharp spines (combs) on their cheeks and the rear edge of their prothorax. They are in the same genus as cat fleas, and are very similar, but can be distinguished by the fact that their foreheads are more rounded. They sometimes appear in large numbers and bite humans, making them important as sanitary pests. [Kohei Sakaguchi] ©Kanzo Otawa "> Schematic diagram of a flea's body structure Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend |
昆虫綱ノミ目(隠翅(いんし)目)ヒトノミ科に属する昆虫。体長は雄約2ミリメートル、雌約3ミリメートルで、世界各地に分布するが、アフリカおよびアジアの熱帯地域にはあまり多くない。イヌを主体に、ネコ、イタチ、キツネ、その他の食肉獣に寄生する。ヒトノミに似ているが、ほおと前胸後縁部に鋭くとがった棘歯(きょくし)の列(櫛(くし))をもつので容易に区別できる。ネコノミとは同属で、きわめてよく似ているが、前頭部がより丸みを帯びていることなどで区別できる。ときに大量に発生してヒトを刺すことがあり、衛生害虫としても重要である。 [阪口浩平] ©大多和鐘三"> ノミの体制模式図 出典 小学館 日本大百科全書(ニッポニカ)日本大百科全書(ニッポニカ)について 情報 | 凡例 |
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