Sea cucumber (Apostichopus japonicus)

Japanese: マナマコ(真海鼠) - マナマコ（英語表記）Apostichopus japonicus

It is an echinoderm of the Holothuriana family. It is found throughout Japan, living in shallow waters from the intertidal zone to depths of about 30m. It is cylindrical, with a body length of 20-30cm and a width of 6-8cm. There are variations in body color, and those that live on rocky reefs in the open ocean have light and dark brown and chestnut markings and are commonly called akako. Those that live on the sandy and muddy bottoms of inland bays and are dark blue-green to blackish are called aoko, and those that are extremely black are called kuroko. From the back to the sides, there are approximately six vertical rows of large and small conical warty feet. The ventral surface is reddish, and the tube feet are densely arranged in three vertical bands.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

ナマコ綱マナマコ科の棘皮（きよくひ）動物。日本各地に分布し，潮間帯から水深30mくらいまでの浅海にすむ。体長20～30cm，体幅6～8cmの円筒状。体色には変異があって外洋の岩礁にすむものは濃淡の褐色と栗色の斑紋があって俗にアカコと呼ばれる。また内湾の砂泥底にすみ，暗青緑色から黒っぽいものはアオコと呼ばれ，極端に黒いのはクロコとも呼ばれる。背面から側面には大小の円錐形のいぼ足がほぼ6縦列に並ぶ。腹面は赤みを帯び，管足は3縦帯に密生している。

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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