Pisaster ochraceus (purple sea star or ochre sea star) (2132256087)

Description:

Description: Note the madreporite (sieve plate), the small white spot which takes in water for the tube feet to operate. You can also see that it is between the two arms pointing to the right, which are called the bivium. If you look directly across to the three arms to the left (trivium), you then know that the middle arm is the anterior arm. These can also be other colors like orange. Date: 24 November 2007, 16:08. Source: Pisaster ochraceus (purple sea star or ochre sea star). Author: Jerry Kirkhart from Los Osos, Calif.