Tamanomidorigai (Tamano green shell) - Tamanomidorigai (English spelling) bivalved snail

Japanese: タマノミドリガイ(玉野緑貝) - タマノミドリガイ（英語表記）bivalved snail

A gastropod of the Acropora family. It has two shells and looks similar to a bivalve. The shell is pale yellow-green, 8 mm long, 4 mm high, and 1 mm wide, and is flat on both sides. When young, it has a rolled shell, but as it grows, the left shell becomes wide and flat, with the original rolled embryonic shell attached on top. A secondary, identical right shell forms on the right side when it becomes an adult. Muscles are located in the center and connect the left and right shells. The soft body is long and slender, with a pair of antennae on the head and eyes located behind their base. The soles of the feet are flat, and the mouth has a row of knife-shaped teeth, indicating that it is a gastropod.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

タマノミドリガイ科の巻貝。2枚の殻をもち外観は二枚貝に似る。殻は薄く黄緑色，長さ8mm，高さ4mm，幅1mmで左右に扁平。幼貝の初期は巻いた殻をもつが，成長するに従って広く平らな左殻となり，本来の巻いた胎殻がその上についている。右側には二次的に同形の右殻ができて成体となる。筋肉は中央にあって左右の殻をつなぐ。軟体は細長く，頭には1対の触角がありその基部の後に眼がある。足裏は平らで，口には小刀状の歯が並んでいるなど巻貝であることを示す。

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

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