カサガイ

か

さ

が

い

Meanings

1

limpet

usually written using kana alone

Refers to limpets, especially the species Cellana mazatlandica. A common marine snail with a conical shell found on rocky shores.

カサガイは岩いわにしっかりくっついている。

Limpets cling tightly to rocks.

貝かい

カサガイUsage100%
kana-only spelling
Katakana spelling is common for this animal name; usually written in kana.
笠かさ貝がい
Kanji spelling using 笠 (conical hat) and 貝 (shellfish); rarely used in practice.
傘かさ貝がい
Alternate kanji spelling using 傘 (umbrella); even less common.

The name likely comes from 笠 (かさ, conical hat) + 貝 (かい, shellfish), referring to the shell's shape. The exact derivation is uncertain.