European physa; tadpole snail; bladder snail
Refers to the freshwater snail Physella acuta. Common in aquariums and ponds.
Bladder snails have been multiplying in the aquarium.
The European physa is a freshwater snail native to Europe.
Katakana spelling is common for this species name; usually written in kana.
Kanji spelling exists but is rarely used; the word is usually written in kana.
The name サカマキガイ literally means 'reverse-winding shell', referring to the sinistral (left-handed) coiling of the shell. The exact derivation is uncertain.