Picture Notes:
A coral was broken to reveal the excavation of this sponge. Notice the strongly colored small papillae breaking out on the right side. The orange sponge encrusting the coral on the left side is Clathria spinosa.
Spicules image:
a) Tylostyles (with spiraster at the same scale); b) ends of tylostyles; c) spirasters. Sample from the Bahamas. Photos and image composite by Angela Marulanda (U. Javeriana, Cali, Colombia).