Species Account

Gibbomodiola adriatica (Lamarck, 1819)

Mytiloidea : Mytilidae

Tebble name: Modiolus adriaticus (Lamarck)
Smith & Heppell name: Modiolus adriaticus (Lamarck, 1819)

Notes on Nomenclature

Here previously as Modiolus adriaticus. Huber (2010) redesignated adriaticus to Gibbomodiola and elevates to generic from subgeneric status.

To size: To 50mm. Shell Structure: Thin, brittle. Equivalve: Equivalve. Equilateral: Strongly inequilateral, beaks very close to the anterior margin. Tumidity: A little inflated, umbos low. Outline: Modioliform, narrowly oblong; ligament margin straight sloping gently and angled with sloping and rather straight posterior dorsal margin; posterior rounded; ventral straight but a little sinuous and sloping upwards to narrowly rounded anterior margin.
var. ovalis more elongate with a less steeply sloping ligament margin.

Sculpture: Smooth with comarginal lines and growth stops. Margin: Smooth. Ligament: Deeply sunken extending for about 3/4 of the ligament margin. Hinge: Hinge plate narrow, smooth. Pallial Musculature: Obscure. Periostracum: Thin almost devoid of any bristles which if present are simple. Colour: Pale brown to golden brown often tinged pink and with a strong radial linear ray; internally white to pink some with a purple radial ray. Var. ovalis darker brown to black.

Distribution & Ecology

A southern species ranging into the English Channel, Irish Sea and SW Ireland. Offshore to moderate shelf depths.
ovalis is restricted to the south coasts of Dorset and Cornwall.

Depth Range
Continental Shelf (to 200m)

Additional Information & Related Species

Additional Comments

var. ovalis Sowerby, 1859 considered to be a synonym of M. adriaticus by CLEMAM and given no significance. It is however quite distinct and has a restricted distribution in the UK and warrants investigation.

Related Species


Listed are literature citing Gibbomodiola adriatica (Lamarck, 1819). Reference containing the species Type Description is highlighted.

Lamarck J B P A de M 1819. Histoire naturelle des Animaux sans vertèbres 6. Paris. 6232pp.


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Record last modified: 22/03/2016