Astarte and Anadara:
Preliminary identification of
mollusk genera is performed in the field by referencing collected
shells against field
book sketches and photographs. The ability to identify a fossil is one of the
most important aspects of an evolutionary study, because the study of
evolution hinges on a scientist's ability to track subtle changes in a
particular species over time. Astarte and Anadara shells
were identified via the following characteristics:
Astarte:
The genus Astarte is characterized by
a pointed umbo, and well defined adductor scars and pallial
lines. Like all mollusks Astarte has annual growth lines,
however the shells lack ribbing, and are always longer then they are
high. (click to enlarge)
Anadara:
The genus Anadara is characterized by a
rounded and partially overturned umbo, and poorly defined adductor
scars and pallial lines. Anadara specimens have growth rings and
shell
ribbing, with shells that are as high as they are long,
giving them a boxy appearance. (click to enlarge)
