Keyhole Limpet

Scientific name
Amblychilepas nigrita
Common name
Keyhole Limpet
Life on the Edge
Page 29
Limpets and allies
Where to find
Underside of basalt boulders
The Keyhole Limpet is generally found beneath rocks and is quite striking in appearance with a largish brown-grey to yellow body on which the relatively small shell sits.  Shell to 2.5 cm across

The name Keyhole Limpet refers to the small rectangular hole in the shell that allows water passing over the gills to efficiently leave the mantle cavity.