Species Account

Brachidontes exustus (Linnaeus, 1758)

Mytiloidea : Mytilidae

Tebble name:
Smith & Heppell name:

To size: To 46 mm. Shell Structure: Solid, thin shell. Equivalve: Equivalve. Equilateral: Beaks at extreme anterior. Tumidity: Not tumid. Outline: Elongated fan/mussel-shaped.

Sculpture: Radial ribs intersepted by concentric ridges, giving a beadlet sculpture. Margin: Roughly crenulated margin. Ligament: Dark brown band along the length of the anterior dorsal margin. Hinge: Dysodont, up to 4 small teeth. Pallial Musculature: Anterior adductor very small, posterior adductor and pedal retractor forms a large mass in the dorsal region. Colour: External yellow to dark brown, internal white with purple and brown mottling.

Distribution & Ecology

New Jersey south throughout the Caribbean and south to Argentina in the intertidal attached to rocks.

In Britain and Ireland it has been found in Gwithin Cornwall.

Depth Range

Additional Information & Related Species


Listed are literature citing Brachidontes exustus (Linnaeus, 1758). Reference containing the species Type Description is highlighted.

Bennett K.F., Reed A.J. & Lutz, R.A. 2011. DNA Barcoding reveals Brachidontes (Bivalvia: Mytilidae) from two ecologically distinct intertidal habitats on Long Key, Florida Keys, are cryptic species, not ecotypes. The Nautilus. 125(2): 63-71.
Linnaeus C 1758. Systema Naturae. Editio decima. 1. Regnum Animale Holmiae, Laurentii Salvii. 824pp.


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Record last modified: 03/03/2022