noun
floral egg crab; shawl crab; brown egg crab
A species of poisonous crab (Atergatis floridus) found in rocky shores of the Indo-Pacific. Its smooth, rounded carapace resembles a steamed bun, hence the Japanese name. The crab contains tetrodotoxin and is not edible.
スベスベマンジュウガニは有毒なので、絶対に食べてはいけません。
The floral egg crab is poisonous, so you must never eat it.
磯でスベスベマンジュウガニを見つけた。
I found a floral egg crab on the rocky shore.
The Japanese name literally means 'smooth steamed-bun crab', from すべすべ (smooth) + まんじゅう (steamed bun) + がに (crab), referring to its smooth, rounded shape.