EVERYDAY SCIENCE

Detailed explanation-1: -Definition. noun, plural: synapomorphies. An advance character state shared among two or more taxa inherited from the most recent common ancestor whose own ancestor in turn is inferred not to have such traits and is derived through evolution.

Detailed explanation-2: -Choanocytes (also known as “collar cells") are cells that line the interior of asconoid, syconoid and leuconoid body types of sponges that contain a central flagellum, or cilium, surrounded by a collar of microvilli which are connected by a thin membrane.

Detailed explanation-3: -These distinctive cells line the interior body walls of sponges. These cells have a central flagellum that is surrounded by a collar of microvilli.

Detailed explanation-4: -The collar cells line the channels and chambers found inside the sponge and by waving their flagella back and forth in unison, they create a current that draws the water into the sponge. The collar cells are specialized for carrying out this function of creating a current.