Note the graze marks left by this little herbivorous limpet that lives only on eel grass, Zostera marina. In recent years this invasive species has wiped out most of the Zostera beds in Monterey Bay by grazing the leafs' epidermis with its chloroplasts and chlorophyll .
Interestingly, this limpet is found only on the straplike fronds of the feather boa kelp Egregia upon which it grazes, as seen here. The deep excavation is characteristic.
