Omphalius pfeifferi pfeifferi (subspecies of top shell)
A specific subspecies of sea snail in the family Trochidae. The name is a taxonomic designation; in everyday contexts, it may simply be referred to as a type of 巻貝.
Bateira is a type of small sea snail found in rocky intertidal zones.
Katakana spelling is standard for this species name; usually written in kana.
Kanji spelling is rare and mainly found in taxonomic or older texts; learners will almost always see the kana form.
The Japanese name バテイラ (馬蹄螺) literally means 'horseshoe spiral shell', from 馬蹄 (horseshoe) and 螺 (spiral shell, snail). The exact origin of the reading is uncertain.