noun
Sesarmops intermedium (a type of grapsoid crab)
A specific species of crab; the name is often written in kana. The kanji 弁慶蟹 references the legendary warrior monk Benkei, possibly due to the crab's appearance.
海岸でべんけいがにを見つけた。
I found a Sesarmops intermedium crab on the shore.
The name likely derives from the legendary warrior monk Benkei (弁慶), possibly because the crab's appearance or behavior is reminiscent of him. The exact origin is uncertain.