Shipworm (Shipworm) - Teredo navalis japonica

Japanese: フナクイムシ(船喰虫) - フナクイムシ（英語表記）Teredo navalis japonica

A type of shipworm (illustration) that bores into underwater timber, such as piers, pilings, aquaculture rafts, timber storage, and wooden ships, and causes damage by living inside them. Shipworms are soft, slender insects that can grow to about 30 cm long, and have a pair of small white shells on the left and right at the front end (deep inside the bored hole), which form a sphere when put together. The rear end (near the entrance of the hole) is narrow and contains a water inlet and outlet pipe, which is surrounded by a pair of calcareous, arrow-like tail plugs on the left and right (illustration).

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

海中の木材，すなわち桟橋，杭，養殖筏，貯木，木造船などに穿孔（せんこう）してその中にすみ害を与えるフナクイムシ科の二（イラスト）。フナクイムシは細長く30cmくらいにもなる軟らかい虫状で，その前端(穿孔した穴の奥のほう)に白い小さい殻が左右1対あって殻を合わせると球状になる。後端(穴の入口のほう)は細くなって，出入水管があるが，これを囲むように左右に対をなして石灰質の矢羽状の尾栓がある（イラスト）。

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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