It can grow up to 50 cm in diameter, although this is exceptional and the arms usually grow to 16.1 cm, with the ratio between the length of the arm and the radius of its disc ranging from 3.6:1 to 5.9:1.
It has five arms and a small central disk.
It can be distinguished from similar species by the distinctive upturned tips of its arms.
The underside is completely yellow.
It shows a wide range of colours on its dorsal side: orange to yellow, sometimes red and purple.
The arms are unevenly covered with small, jagged-edged spines, which line the groove in which the tube feet lie, and join up at the mouth in a fan-like shape.
It can grow up to 50 cm in diameter, although this is exceptional and the arms usually grow to 16.1 cm, with the ratio between the length of the arm and the radius of its disc ranging from 3.6:1 to 5.9:1. It has five arms and a small central disk. It can be distinguished from similar species by the distinctive upturned tips of its arms. The underside is completely yellow. It shows a wide range of colours on its dorsal side: orange to yellow, sometimes red and purple. The arms are unevenly covered with small, jagged-edged spines, which line the groove in which the tube feet lie, and join up at the mouth in a fan-like shape.
Asterias amurensis