Arene bairdii (Dall, 1889) is a small gastropod (up to 6 mm, or about ¼ inch) that belongs in the relatively small (in number of species) family Areneidae. The species has a pink-red shell with 5–7 rows of saw tooth-like projections. Arene species have a shelly, round operculum. This “Shell of the Week” is found from North Carolina south to northeastern Brazil. In the southern part of its range the species is found mostly in coral reef habitats.
