Diloma Samoaense is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails. Diloma Samoaense got its name from the Samoan islands where it first originated
The size of the shell varies between 8 mm and 11 mm.
This marine species occurs off Tutuila, the largest and the main island of American Samoa in the archipelago of Samoan Islands.