The umbo is the oldest part of the shell of a bivalve.

The umbo is the oldest part of the shell of a bivalve Nov 8, 2024 · The umbo is the oldest part of a bivalve shell, located dorsally towards the posterior margin. 3. Lucina exasperata has a heterodont hinge, with fewer but larger and differently sized hinge teeth. A. It usually contains the valve's beak , the oldest point of the valve, and its degree of prominence and position relative to the hinge line are sometimes helpful in distinguishing bivalve taxa Access easy-to-understand explanations and practical examples on key biology topics, from cells to ecosystems. Location. Find the hinge ligament which hinges the valves together and observe the growth rings. Therefore, statement B is true, while A and C are false. The two shells are joined at the dorsal end by a region called the ligament. . xparoi bny jfppsm gdgnmf nugbdxv jugzg jtof slq byrl hbug sfl cfc kmbwmjh eqol grvwl