Question #155005
Define the following terms: Collar cell and Specula?
Expert's answer
Collar cells are cells that line the interior of the choanoderm, a cell layer in sponges. These cells contain a central flagellum surrounded by microvilli joined by a thin membrane.
Specules are structural components of sponges providing structural support and protection from predators. These structures can be calcareous or siliceous.
