Black Keyhole Limpet

Amblychilepas nigrita

Amblychilepas nigrita is a marine gastropod mollusk characterized by its oval and flattened shell, which ranges in size from 10 mm to 25 mm. The shell is externally black with fine radial striations and features a large, oval dorsal aperture bordered by a smooth white margin. Internally, the shell is white, with thickened posterior and lateral margins. This species can be distinguished from similar species by its unique shell shape and coloration. This species is endemic to Australia and can be found in shallow waters off southern Queensland, Western Australia, and Tasmania. It typically inhabits areas under stones, making it a bottom-dwelling organism. Amblychilepas nigrita is recorded at depths shallower than 40 meters, with most occurrences found under 10 meters. Dietary habits of the black keyhole limpet are not detailed in the sources, but as a limpet, it likely grazes on algae and other organic matter. Breeding behaviors are also not specified, but limpets generally exhibit reproductive strategies typical of marine gastropods. Encountering this species while diving may involve spotting it nestled among rocks or under stones, where it can blend into its surroundings, making it somewhat cryptic. The conservation status of Amblychilepas nigrita is not evaluated in the sources, indicating that there may be no current significant threats identified. However, divers should always be mindful of their impact on marine environments to ensure the continued survival of such species.