Madreporites on sea stars

The madreporite is a lightcolored calcerous opening used to filter water into the water vascular system of echinoderms. It acts like a pressure-equalizing valve. […] Close up, it is visibly structured, resembling a “madrepore” (stone coral, Scleractinia) colony.” — Wikipedia

Image 1: Madreporites, from Pierce and Maugel’s 1987 Illustrated Invertebrate Anatomy (via “How Starfish Move”)

Image 2: Madreporite of Henricia pumila:The madreporite is creamy colored as in the type specimen.  Notice the papulae extended among the pseudopaxillae.” (Source)

Bookmark the permalink.

Leave a Reply