Perumytilus purpuratus is a small intertidal marine bivalve mollusk in the family Mytilidae, commonly known as chorito maico. The genus name Perumytilus combines “Peru” with Mytilus, the classical Latin genus name for mussels while the species epithet purpuratus comes from Latin meaning “clad in purple”. The Chilean common name "little Maico mussel", with the word Maico likely being a regional or Indigenous word used to distinguish this smaller, shore-dwelling species from larger mussels. It is native to the southeastern Pacific and southwestern Atlantic coasts of South America, particularly along the rocky shores of Peru, Chile, and southern Argentina, where it forms dense mussel beds in the mid- to high-intertidal zone.

Archaeological evidence shows that Perumytilus purpuratus has been harvested by coastal peoples since at least the early Holocene, serving as an important, reliable source of animal protein for maritime foragers. Historically, it was collected by hand at low tide and consumed fresh, roasted, or dried, and its shells frequently appear in shell middens associated with pre-Columbian coastal cultures. In modern times, it is still eaten locally, though it is less commercially prominent than larger mussel species and is more commonly used in subsistence, small-scale fisheries, or traditional coastal dishes.

Perumytilus purpuratus is primarily consumed as whole mussel meat once cooked, yielding a simple shellfish ingredient used in soups, stews, and mixed seafood preparations rather than producing a wide range of secondary ingredients. Nutritionally, it is rich in protein, essential amino acids, and marine lipids such as omega-3 fatty acids. Like many filter-feeding bivalves, it can also accumulate potentially toxic compounds, including heavy metals and marine biotoxins such as saxitoxin during harmful algal blooms, making harvesting practices and seasonal knowledge crucial for safe consumption.