Paramecium (Japanese sandal worm) - Paramecium caudatum

Japanese: ゾウリムシ(草履虫) - ゾウリムシ（英語表記）Paramecium caudatum

A protozoan of the family Paramecium, class Holtica, subphylum Ciliata (illustration). The English name "slipper animacule" comes from the fact that its body shape resembles a shallow-soled indoor shoe, and the Japanese name is the same. It is commonly found in ponds, swamps, and puddles. Its body is spindle-shaped and 170-290 μm long. Its front end is rounded and its rear end is pointed and conical. Its entire surface is densely covered with cilia, the latter of which is long and looks like a bundle. Its ventral surface has an oral groove about half the length of its body, through which microbial food such as bacteria is taken into the body via the cytopharynx.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

繊毛虫亜門全毛綱ゾウリムシ科の原生動物（イラスト）。英名のslipper animaculeは体型が室内ばき用の浅底の靴に似ているところからでた名で和名はその訳。池，沼や水たまりなどにふつうに見られる。体は紡錘形で，長さ170～290μm。前端は丸く，後端は円錘形状にとがっている。全面に繊毛が密生していて，体の後端のものは長く，束のように見える。腹面には体長の約半分ほどの口溝があり，バクテリアのような微生物の食物は，ここを通って細胞咽頭から体内にとり入れられる。

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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