Mercenaria stimpsoni (species of Venus clam)
A species of saltwater clam found in East Asian waters. Scientific name Mercenaria stimpsoni.
The binosugai is a type of bivalve found in the seas around Japan.
Katakana spelling is standard for this species name.
Ateji kanji spelling; rarely used. The word is usually written in kana.
The origin of the name is uncertain. The kanji 美之主貝 is ateji and does not reflect the etymology.