noun
Pinna bicolor (species of pen shell)
A marine bivalve mollusk; the name is usually written in katakana.
ハボウキガイは内湾の砂泥底に生息する。
Pinna bicolor lives on sandy-muddy bottoms in inner bays.
The name likely derives from the shell's resemblance to a feather duster (羽箒, はぼうき).