遊ゆう泳えい肢し

noun

pleopod; swimmeret

Technical term in zoology for the paired abdominal appendages of crustaceans used for swimming, brooding eggs, or creating water currents.

• エビの遊ゆう泳えい肢しは、腹はらの下したに並ならんでいる。

  The shrimp's swimmerets are lined up under its abdomen.

• メスのザリガニは遊ゆう泳えい肢しに卵たまごを抱かかえる。

  Female crayfish carry their eggs on their swimmerets.