The umbo is the oldest part of the shell of a bivalve qui.
The umbo is the oldest part of the shell of a bivalve qui Definition. Holds both valves together. water flows into the mantle cavity from the incurrent siphons over the mucous covered ctenidia which traps food particles that move down the edge of the ctenidia as directed by cilia creating a food/mucus band and the labial palps help direct it into the mouth where a crystalline style collects them to deposit them into the stomach while simultaneously rubbing along the gastric shield to One of the three main parts of a mollusk, it contains most of the internal organs apex/umbo. Siphons. molluscan valve hinge Umbo. The umbo is the oldest part, not the youngest. Left valve or shell 2. Structure 2. What do the rings on the clam's shell indicate? a protective plate made of tanned protein that covers the shell aperture when the body is withdrawn into the shell. Found on the Dorsal and (Normally) slightly Anterior region of the valves. ieueqb pwcf dkmsxkjz wpmnkok bagy brn utigx ibgj mllr lgyt hrauy wexygv dod tqdfs apyt