Portlandia intermedia (M.Sars, 1865)
Nuculanoidea : Nuculanidae
Solid, but not robust.
Moderately inequilateral, the beaks lie at least 40% of dorsal margin length from anterior. Becomes more inequilateral with growth.
Elongate-oval: antero-dorsal margin short, slightly curved; postero-dorsal margin long, almost horizontal with a dorsal margin – posterior margin junction; lower posterior margin obliquely truncated; to a lesser extent the upper posterior margin may also be obliquely truncated, creating a pointed or weakly rostrate posterior margin; anterior margin rounded; ventral margin shallowly curved. Dorsal margin crimped either side of the umbo. Elongate lunule and escutcheon. Umbo broad, swollen and prominent above the dorsal margin, well to the anterior of midline.
Sculpture: Virtually lacking sculpture, with only faint concentric lines and growth stops. Margin: Smooth. Ligament: Amphidetic, with the ligament seated in a well developed, projecting chondrophore. Hinge: Taxodont: Hinge plate continuous, relatively narrow with 5-6 blunt, chevron-shaped teeth on either side of the ligament. Periostracum: Glossy, dark straw-coloured with darker bands at growth stops. Colour: White. Additional Characters: The hind-gut forms a simple, rounded loop on the right side of the body.
Distribution & Ecology
Arctic, circumpolar species, living mostly in depths of 20-300m. Richling (2000) gives a depth range of 7-520m.
Continental Shelf (to 200m)
Continental Margin Zone (200 - 500m)
Additional Information & Related Species
Nuculanoidea : Nuculanidae
Listed are literature citing Portlandia intermedia (M.Sars, 1865). Reference containing the species Type Description is highlighted.
Killeen I.J. & Turner J. 2009. Yoldiella and Portlandia (Bivalvia) from the Faroe-Shetland Channel and Rockall Trough, Northeast Atlantic. Journal of Conchology. 39 (6): 733-778.
Sars M 1865. Malacozoologiske lagttagelser. Forhandlinger i Videnskabsselskabet i Kristiania. 1864: 283-315.
Warén A 1989. Taxonomic comments on some protobranch bivalves from the northeastern Atlantic. Sarsia. 74: 223-259.
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