Species Account

Irus irus (Linnaeus, 1758)

Veneroidea : Veneridae

Tebble name: Notirus irus (Linnaeus)
Smith & Heppell name: Irus irus (L., 1758)

To size: To 26mm. Shell Structure: Brittle shell. Equivalve: Equivalve. Equilateral: Inequilateral. Beaks in front of midline. Tumidity: Not tumid. Outline: Oblong, narrowed anteriorly. Lunule very small, indistinct in some specimens where the sculpture encroaches upon it. Escutcheon extensive, almost reaching posterior margin; prominent in LV as sunken area. In RV is encroached upon by sculpture.

Sculpture: Few, well-spaced concentric frill-like lamellae interspersed by radial grooves and concentric lines to give cancellate sculpture. The lamellae become more elongated toward the posterior margin where they become more flamboyant. Margin: Smooth, but the ventral part of last lamellae is wavy, giving the appearance of a crenulate margin in some. Ligament: Sunken into escutcheon, appears as a dark band that extends just over a third of the dorsal margin. Hinge: 3 cardinals in each valve in LV central and anterio bifid, in RV central and posterior bifid. No laterals. Pallial Musculature: Pallial sinus extends between a third and half length of shell and is rounded. Periostracum: Thin, matt. Colour: Cream/off-white shell with beige/orange colouration on anterior and posterior margins.

Distribution & Ecology

A nestling species in crevices and empty borings, intertidal and sublittoral. Restricted to the English Channel, north into the Irish Sea and south and west of Ireland.

Depth Range
Continental Shelf (to 200m)

Additional Information & Related Species


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

Linnaeus C 1758. Systema Naturae. Editio decima. 1. Regnum Animale Holmiae, Laurentii Salvii. 824pp.


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Record last modified: 22/03/2016