Diodora ruppellii
species of mollusc
Diodora ruppellii, Rüppell's keyhole limpet, is a species of sea snail, a marine gastropod mollusc in the family Fissurellidae, the keyhole limpets.
Description
Diodora ruppellii has a shell with a whitish exterior marked with a radial pattern of dark blotches and a white interior surface marked with a faint pattern similar to the exterior. The shell is asteeply conical, elongated oval with a hole at the apex, which is roughly a third of the length of the shell from its anterior end. There are 20 to 25 radiating ribs on the exterior surface of the shell with some smaller ribs between them; the growth ridges are not as developed as the ribs and form knobs at where they intersect. The edges of the apical hole have conspicuous crenulations where they meet the ribs, the notches between the crenulations continue a short distance towards the inside of the shell. The shell can be up to 20 mm long, although 15mm is the most common length, and 10 mm high, in Red Sea specimens.
Distribution
Diodora ruppellii has an Indo-Pacific distribution occurring in the Red Sea and along the east African coasts as far south as KwaZulu-Natal and east through the Indian Ocean and Pacific Ocean to Hawaii. It was recorded in the Suez Canal in 1905 and reaching the Mediterranean in 1948 when it was recorded off the coast of Israel and had spread to south-eastern Turkey by 1995.
Ecology
Species in the genus Diodora feed on sponges from the undersides of rocks and boulders. Diodora ruppellii is normally found in the intertidal zone on rocky shores but has been dredged up from gravel substrates.
“Diodora ruppellii” enters the record as species of mollusc. Crown Archives preserves that source wording while asking what Diodora, ruppellii and species can confirm, complicate or overturn.
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The date and method of observation matter as much as the stated conclusion, especially where classification or consensus has changed. The source revision retrieved here is dated May 20, 2026. The linked authority identifier is Q5279153. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1905, 1948 and 1995.
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This entry incorporates text from “Diodora ruppellii” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.