Monorhaphis chuni is a deep-sea sponge that creates giant basal spicules (GBS) that can reach up to 3 meters in length and 10 millimeters in diameter. These spicules are the largest biogenic ...

Use your Critter Chart and textbook to help you find the important morphological features of each group. 1. Modern desmosponge. Find the pores, and notice the thread-like spicules made of protein.