### Identification The Cande’s Barrel-Bubble (*Acteocina candei*) is a master of miniature architecture. This tiny gastropod reaches a mere 3–5mm in length, appearing to the naked eye like a grain of polished white rice. Under a hand lens, you’ll see a glossy, porcelain-white shell with a distinctively cylindrical, "barrel" shape. The most critical field mark is its stepped spire; unlike many bubble snails with sunken tops, *A. candei* features a spire that rises in tiny, sharp tiers, resembling a winding staircase. Its aperture (opening) is narrow at the top but flares out into a rounded base, giving it a weighted, elegant profile.
### Habitat & Range This species is a quintessential resident of the Western Atlantic, ranging from the coast of North Carolina through the Caribbean Sea down to Argentina. You won't find them on rocks; instead, look for them in the soft, calcareous sands and silty mud of lagoons and shallow sub-tidal flats. They are often found in the "micro-deserts" between seagrass patches, thriving at depths from the low-tide mark down to the continental shelf.
### Behaviour *Acteocina candei* is a secretive, infaunal burrower. An observer at low tide might spot the faint, wandering "plough-tracks" they leave in the surface film of wet sand. They spend most of their lives submerged just beneath the sediment to avoid desiccation and predators. They are solitary and move using a broad, fleshy foot that is too large to fully retract into their shell—a common trait among "bubble" snails.
### Diet Don’t let its delicate appearance fool you; this is a specialized micro-predator. It hunts primarily for Foraminifera—tiny, single-celled organisms with hard shells. Using its sensitive cephalic shield to "sniff" through the sand, it locates its prey and swallows it whole.
### Fascinating Fact Because they swallow hard-shelled prey whole, *Acteocina candei* possesses a "gastric mill" inside its body. This internal "rock crusher" consists of three calcareous gizzard plates that grind against each other to crack open the shells of foraminiferans, allowing the snail to digest the soft protoplasm inside!