Dacrydium ockelmanni Mattson & Warén, 1977
Mytiloidea : Mytilidae
Very small to 4mm.
Inequilateral beaks close to anterior margin.
Outline modioliform, beaks subterminal; ventral margin long more or less straight; dorsal margins almost straight, anterior dorsal very short, anterior narrowly rounded and pronounced, posterior dorsal long sloping steeply relative to ventral margin; posterior and posterior ventral margins forming a smooth broad curve.
Prodissoconch small about 140μm in diameter.
Sculpture: Sculpture smooth except for scattered weak growth lines. Margin: Inner margin smooth. Ligament: Ligament small, internal, situated in a distinct sunken resilifer beneath the beaks. Hinge: Hinge plate narrow, ligament margin with up to 50 small dysodont teeth, these decreasing in size towards the beaks; a few small teeth are also present anterior of the beaks. Pallial Musculature: Anterior adductor scar about 1/2 size of posterior. Periostracum: Transparent. Colour: White, glassy.
Distribution & Ecology
Continental Margin Zone (200 - 500m)
Bathyal (500 - 2000m)
Additional Information & Related Species
Key Features & Similar Species
Mytiloidea : Mytilidae
Listed are literature citing Dacrydium ockelmanni Mattson & Warén, 1977. Reference containing the species Type Description is highlighted.
Mattson S & Warén A 1877. Dacrydium ockelmanni sp. n. (Bivalvia: Mytilidae) in Western Norway. Sarsia. 63: 1-6.
Olabarria C. 2005. Patterns of bathymetric zonation of bivalves in the Porcupine Sea Bight and adjacent abyssal plain, NE Atlantic. Deep-Sea Research I. 52: 15-31.
Salas C & Gofas S 1997. Brooding and non-brooding Dacrydium (Bivalvia: Mytilidae): a review of the Atlantic species. Journal of Molluscan Studies. 63: 261-283.
Warén A 1991. New and little known Mollusca from Iceland and Scandinavia. Sarsia. 76: 53-124.
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