limpet
Refers to limpets, especially the species Cellana mazatlandica. A common marine snail with a conical shell found on rocky shores.
磯でカサガイをたくさん見つけた。
I found many limpets on the rocky shore.
カサガイは岩に
Limpets cling tightly to rocks.
Katakana spelling is common for this animal name; usually written in kana.
Kanji spelling using 笠 (conical hat) and 貝 (shellfish); rarely used in practice.
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.