Calthalotia fragum is the common name of the spotted strawberry top shell or the comtesse's top shell, is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.

[2] The size of an adult shell of this species varies between 8 mm and 25 mm.

This marine species occurs off Southeast Australia, Queensland, Victoria, New South Wales and Japan.