noun
spider conch
Refers specifically to the species Lambis chiragra, a large sea snail with distinctive spider-like projections on its shell.
スイジガイは沖縄の海で見られることがある。
Spider conchs can sometimes be seen in the waters around Okinawa.
The Japanese name スイジガイ (水字貝) literally means 'water-character shell', referring to the shell's projections that resemble the kanji 水 (water).