You searched for: “hexactine
Sponge anatomy including a spicule with six equal and similar rays meeting at right angles.

Spicule is a small pointed structure serving as a skeletal element in various marine and freshwater invertebrates; such as, sponges and corals

This entry is located in the following units: actino-, actin-, actini-, -actinal, actis- + (page 6) hex-, hexa- (page 1)