More help, please

[mikede]

Do you know the locality data of these shells?

The first one could be one of several very similar species distributed all over the world (Arca zebra, Arca noae, Arca navicularis, Arca pacifica etc.). The second set contains 3 species of the family Arcidae from the genus Anadara, but without locality data Anadara species are very hard to tell apart. The two smaller shells from the third set are probably from the genus Americardia (family Cardiidae) and the bigger shell is probably a Barbatia sp.