Blue-green algae (sea cucumber) - blue-green algae

...Body color varies, and those that live on the reefs of 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 black are called Aoko, and those that are extremely black are called Kuroko. On the back and sides, there are about six vertical rows of large and small cone-shaped warts.

*Some of the terminology that refers to "blue-green algae (sea cucumber)" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…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。…

※「アオコ（ナマコ）」について言及している用語解説の一部を掲載しています。

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