Growth Lines
Note: In temperate latitudes such as the metro region growth lines are laid down annually. Complete growth lines may thus be counted to approximate mussel age.
Anodonta implicata |
Ligumia nasuta | Growth lines vary among species, appearing as concentric circles of ridges or contrasting bands of color that mark the stages of growth. |
Lampsilis cariosa |
Pyganodon cataracta | The color and texture of the periostracum may conceal or highlight the pattern and color of the growth lines. |