Diloma aridum
Diloma aridum is a species of small sea snail, a marine gastropod mollusc in the family Trochidae. This species is a part of the broader genus Diloma that engrosses other marine gastropods like Diloma aethiops and Diloma bicanaliculatum.
Diloma aridum is primarily found on sheltered mid-tidal rocks in the Chatham Islands and Auckland Islands and is habitual to specific regions in New Zealand.