The madreporite can be easily identified as the light-coloured circle, located slightly off centre on the central disc. This is a porous plate which is connected via a calcified channel to the animal's water vascular system in the disc. Its function is, at least in part, to provide additional water for the animal's needs, including replenishing water to the water vascular system. Near the madreporite, also off centre, is the anus. On the oral surface there is an ambulacral groove running down each arm. On either side of this there is a double row of unfused ossicles. The tube feet extend through notches in these and are connected internally to the water vascular system.
I did a research about the appearance of the starfish, focusing on the body surfaces. And tried to apply these attributes in 3D modeling.
Dissection of Asterias rubens
1 – Pyloric stomach 2 – Intestine and anus 3 – Rectal sac 4 – Stone canal 5 – Madreporite 6 – Pyloric caecum 7 – Digestive glands 8 – Cardiac stomach 9 – Gonad 10 – Radial canal 11 – Tube feet
- Images from google.com