Rocking Chair Limpet

Lottia instabilis

Lottia instabilis is a distinctive limpet found in the northeastern Pacific Ocean, ranging from Kodiak Island in Alaska to San Diego, California. Its shell is uniquely shaped with an elongated, nearly parallel rim that is raised at both ends, allowing it to adhere to the curved surfaces of kelp holdfasts and stipes. The shell is typically smooth and brownish, with variations in color and pattern depending on geographical location, with northern individuals being larger and more uniformly colored compared to their southern counterparts, which exhibit tessellated patterns. The interior of the shell is bluish-white, often featuring a dark margin and a blotch near the apex. This species inhabits the intertidal zone and shallow sub-littoral areas, typically at depths ranging from the surface down to about 73 meters. It thrives on kelp, feeding primarily on species such as Saccharina dentigera and Pterygophora californica. As a specialized herbivore, it is closely associated with its kelp hosts and can be considered a parasite due to its feeding habits. The limpet’s main predator is the purple seastar, which it evades by fleeing when approached. Lottia instabilis reproduces through a broadcast spawning method, where embryos develop into planktonic larvae before maturing into adults. Encounters with this limpet during dives can be common, especially in kelp forests, where they can be spotted clinging to the kelp structures. While the conservation status of this species is not evaluated, it is often found in environments that are subject to various ecological pressures.