Polymastia sponge
Polymastia sponge (Polymastia arctica). Sponges are simple multicellular animals, most species of which are marine. The internal skeleton (endoskeleton) of a sponge is formed from structures called spicules. Photographed in the Russian Arctic, in the White Sea., by ALEXANDER SEMENOV/SCIENCE PHOTO LIBRARY
Details
License type
Rights Managed