noun
cockscomb pearl mussel
A freshwater mussel species (Cristaria plicata) found in East Asia, known for producing pearls. The name literally means 'crow shellfish', referring to its dark shell.
からすがいは淡水に生息する二枚貝です。
The cockscomb pearl mussel is a freshwater bivalve.
この湖ではからすがいが真珠を作ることがあります。
In this lake, cockscomb pearl mussels sometimes produce pearls.
The name からすがい (烏貝) literally means 'crow shellfish', likely from the dark, crow-like color of the shell. The exact origin is uncertain.