About Alia carinata (Hinds, 1844)
Alia carinata is a species of dove snail. The adult shell of this species reaches a length between 6 and 11 mm (0.24–0.43 inches). Its body whorl varies in the development of its keel: it may be distinctly carinate (keeled), weakly keeled, or lack a keel entirely. Shell color is quite variable, ranging from a single uniform shade to a patterned mix of multiple colors. This species has a stenoglossan radula that has bicuspate lateral teeth and a slightly curved rachidian tooth.
Alia carinata occurs in the Eastern Pacific Ocean, ranging from Alaska south to Baja California, Mexico. Individuals live on patches of algae, rocks, and eelgrass, and are found most often on surfgrass.
Ecologically, Alia carinata can detect the presence of predators using only chemical cues dissolved in the surrounding water. When approached by its predator, the sea star Leptasterias hexactis, A. carinata may respond by fleeing, rearing up, or fighting. Fighting typically only occurs after the snail has already attempted to escape, and during fights the snail bites the tube feet of the pursuing sea star. Several amphipod species, including Thorlaksonius platypus, are known to mimic Alia carinata.
