noun
collector urchin; Tripneustes gratilla
A species of sea urchin. The name literally means 'white-beard sea urchin'.
シラヒゲウニは沖縄の浅い海でよく見られる。
Collector urchins are often seen in the shallow waters of Okinawa.
この水槽にはシラヒゲウニが三匹いる。
There are three collector urchins in this tank.
Compound of 白髭 (しらひげ, 'white beard') and 海栗 (うに, 'sea urchin'), referring to the white spines that resemble a beard.