Amphioxus (Slugfish) - Branchiostoma belcherii

Japanese: ナメクジウオ(蛞蝓魚) - ナメクジウオ(英語表記)Branchiostoma belcherii
Amphioxus (Slugfish) - Branchiostoma belcherii
A protochordate of the family Amphioxus of the class Cephalochordate (illustration). When this species was first discovered in England about 200 years ago, it was said to resemble the mollusc slug, and so the name came to be used in Japan as well. It is important as an animal in the transitional process from invertebrates to vertebrates. It is distributed from Sagami Bay to the coast of Kyushu, and inhabits coarse sandy areas with good permeability and little organic matter. During the day, it usually burrows into the sand, with only its mouth above the sand, but at night it comes out onto the sand and can move swiftly over short distances by bending its body from side to side.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
頭索綱ナメクジウオ科の原索動物(イラスト)。200年ほど前にイギリスでこの類が初めて発見されたときに軟体動物のナメクジに似ているとされたため,日本でもこの名が使われるようになった。無脊椎動物から脊椎動物へ移行する過程にある動物として重要である。相模湾から九州沿岸に分布し,透水性がよい有機物の少ない粗い砂地に生息する。ふつう,昼間は砂の中に潜り,口だけを砂上にだしているが,夜は砂上にでて体を左右に曲げて短距離を敏しょうに移動することもする。

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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