Ceratium tripos

Japanese: ツノオビムシ(英語表記)Ceratium tripos
Ceratium tripos
Kingdom Protista, phylum Alveolata, family Acanthopodidae. The shell is anchor-shaped, 0.1-0.3 mm long, and 0.04-0.08 mm wide. The anterior corner of the upper shell is straight and tilts slightly to the left when viewed from the ventral side. The two posterior corners of the lower shell open to the left and right and point upward, but the left corner is slightly shorter than the right corner. This is the most common warm-water species found in Japanese waters, and its form changes depending on the environment; for example, when it moves from warm waters to cold waters, the anterior horns naturally break off to reduce its buoyancy.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:
原生生物界アルベオラータ門ウズオビムシ科。殻は錨形で,殻長 0.1~0.3mm,殻幅 0.04~0.08mm。上殻の前角はまっすぐで,腹面から見ると多少左に傾いている。下殻の 2本の後角は左右に開きながら上方に向かうが,左角が右角より少し短い。日本近海では最も普通の暖海種で,水温の高い水域から低い水域に入ると前角が自然に切れて自身の浮力を減らすなど,環境の変化によって形態を変える。

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