noun
Placamen tiara (species of venerid clam)
A specific species of saltwater clam; a technical term used in biology and shell collecting.
ハナガイは潮干狩りで見つかることがある。
Placamen tiara can sometimes be found during clam digging.
The name likely derives from 花 (hana, 'flower') and 貝 (kai, 'shellfish'), referring to the shell's flower-like pattern. The exact origin is uncertain.