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Diodora graeca

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Kingdom  Animalia
Class  Gastropoda
Family  Fissurellidae
Scientific name  Diodora graeca
Phylum  Mollusca
Superfamily  Fissurelloidea
Genus  Diodora
Rank  Species
Diodora graeca Diodora grca

Similar  Diodora italica, Diodora, Emarginula, Clanculus cruciatus, Jujubinus striatus

Diodora graeca (common name : Greek keyhole limpet), is a sea snail or limpet, a marine gastropod mollusk in the family Fissurellidae, the keyhole limpets.


Diodora graeca AnimalBase listthumbnails

It was originally described by Linnaeus in 1758 as Patella graeca (basionym).


Diodora graeca 2 Diodora graeca Lengths 164mm about 175mm before post Flickr

This keyhole limpet can be found beneath stones and clinging to rocks in the sublittoral zone (up to a depth of a few hundred meters) in the Mediterranean and West Africa to the North Sea (widespread on the coasts of Ireland and western Britain) and the subarctic North Atlantic. The specimens washed up on the beaches of the North Sea are almost certainly fossil (from the Pliocene and the Eemian), as this species no longer occurs in the south-eastern part of the North Sea.


Diodora graeca MarLIN The Marine Life Information Network A keyhole limpet

The oval shell is small (25 mm long and 18 mm wide) and rather flat. It has no whorls and is shield-shaped. The base of the shell is somewhat bent. Its aperture is situated at the dorsum and is keyhole-shaped. This hole serves as an outlet for water and waste products. The shell has a slight reticulated sculpture with concentric cords crossed by radial ridges and with the alternate ridges larger. The color of the shell varies from creamy white to yellow white and is often slightly orange tinted.

This species is mainly herbivorous and also feeds on detritus. The animal has a broad creeping foot and a developed mantle. Its carotenoid content has been investigated and the following substances have been found : α-, β, γ-carotene, zeaxanthin, diatoxanthin, mutatoxanthin and astaxanthin.


  • Fissurella mamillata Risso, 1826
  • Fissurella reticulata (Da Costa, 1778)
  • Patella apertura Montagu, 1803
  • Patella graeca Linnaeus, 1758

  • Diodora graeca Diodora graeca Wikipedia

    Diodora graeca imagesmarinespeciesorgthumbs70161diodoragrae

    Diodora graeca Diodoragraeca3jpg


    Diodora graeca Wikipedia