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Disco, Greenland

Altenaeum dawsoni (Jeffreys, 1864)
NMW Image No.

Altenaeum dawsoni (Jeffreys, 1864)

Galeommatoidea : Montacutidae
Tebble name: n/a
Smith & Heppell name: Mysella dawsoni (Jeffreys, 1864)

To size: To 1.5mm. Shell Structure: Solid. Equivalve: Equivalve. Equilateral: Inequilateral, beaks close to posterior margin. Tumidity: Moderate. Outline: Obliquely oval, extended anterior ventrally; posterior gently curving to more narrow posterior ventral margin, anterior more rounded. Contour: Prodissoconch very large, its margins weakly elevated.

Sculpture: Prodissoconch granular, adult shell almost smooth with weak concentric striations and stronger growth stops. Margin: Inner margin smooth. Ligament: Internal, small set in a shallow resilifer on the hinge plate beneath the beaks. Hinge: RV with two cardinal teeth, the anterior relatively massive, the posterior variably developed but usually small, anterior lateral tooth long, prominent, bounded by a groove dorsally, posterior lateral tooth much weaker. LV with two very weak cardinal teeth the anterior almost obsolete, anterior lateral marginal in position, more prominent than posterior lateral. Pallial Musculature: Pallial line entire. Colour: Shell white.

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Distribution & Ecology

Described from apparently live collected material off the northeast coast of Scotland but is primarily a boreal subarctic species.

Depth Range
Continental Shelf (to 200m)

Juveniles & Similar Species

Juvenile Description

Key Features & Similar Species
The two large cardinal teeth in the RV give a similarity to species of Kurtiella but in Altenaeum the ligament is on the hinge plate and not beneath the umbos and there are lateral teeth present.

Additional Comments

Galeommatoidea : Montacutidae


Listed are literature citing Altenaeum dawsoni (Jeffreys, 1864). Reference containing the species Type Description is highlighted.
Backeljau T, Meyer M de, Janssens L, Proesmans R 1984. The systematics and distribution of Altenaeum dawsoni (Jeffreys, 1864) with special reference to some new records from northern Norway (Mollusca, Bivalvia: Condylocardiidae?). Sarsia. 69: 205-209.
Daan R, Duineveld GCA, Lavaleye MSS & Mulder M 2001. Four marine mollusc species new to the Dutch recent fauna. Basteria. 65: 93-99.
Jefffreys J G 1864. British Conchology, vol. 2 Van Voorst, London. 479pp.
Spaink G 1972. Altenaeum nortoni nov. gen nov. spec. (Lamellibranchia: Condylocardiidae) from the Pleistocene of the southern North Sea Basin. Basteria. 36: 143-147.
Van Aartsen JJ 1996. Galeommatacea and Cyamiacea Part II. La Conchiglia. 281: 27-53, + 61.




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Record last modified - 14/01/2014