棘の先端が白いのでツマジロナガウニと言います。 The main feature of this sea urchin is that the spine tip is white.Scientific Name : Echinometra tsumajiro Family: Echinometridae Order: Echinoida Photo taken at Aquamarine Fukushima

寄り添うジンガサウニ。 Sea urchins cuddling each other.Scientific Name : Colobocentrotus mertensii Family: Echinometridae Order: Echinoida Photo taken at Tokyo Sea Life Park

パイプウニ。 夜行性で昼間は岩の間に潜む。 岩陰に潜伏中は、キャッチ結合組織の働きによってトゲは強力に固定さていれる。Slate pencil urchin. It is nocturnal and remains hidden behind rocks during the day. While hiding in rocks, needles are fix…