Amblychilepas nigrita
Amblychilepas nigrita, common name the black keyhole limpet, is a species of sea snail, a marine gastropod mollusk in the family Fissurellidae, the keyhole limpets.
Description
The size of the shell varies between 10 mm and 25 mm.The shell is oval and flattened, with slightly compressed sides and gently raised extremities. Internally, it is white, featuring thickened posterior and lateral margins. Externally, the shell is black, adorned with fine radial striations. The dorsal aperture is large, oval in shape, and bordered by a smooth, white margin.