Center left side of photo.
A small an a large specimen seen at the coral reef. The species is seen quite often at Sail Rock
This orange encrusting sponge was about 12" by 3" and growing on a piling in the marina with mussels, tubeworms, barnacles and more. It looks like little orange craters, so I wonder if it could be a Hamigera species called Orange Cratered Encrusting Sponge.
Sponges are animals of the phylum Porifera (/pɒˈrɪfərə/; meaning "pore bearer"). They are multicellular organisms that have bodies full of pores and channels allowing water to circulate through them, consisting of jelly-like mesohyl sandwiched between two thin layers of cells. Sponges have unspecialized cells that can transform into other types and which often migrate between the main cell layers and the mesohyl in the process. Sponges do not have nervous, digestive or circulatory systems. Instead, most...