Asperarca nodulosa (Müller, 1776)
Arcoidea : Arcidae
Inequilateral, beaks at about 1/4 length of dorsal margin from anterior.
Trapezoidal, posterior greatly expanded, umbos low; dorsal margin long, straight; posterior margin almost straight, sloping obliquely; ventral and anterior margins continuous gently curved or with a shallow sinus; anterior roundly pointed.
Posterior angle prominent, rounded; median area flat or slightly concave; dorsal area narrow, flat.
Sculpture: Strong of radial and comarginal ribs and ridges; comarginal dominant over median area intersected by radial and nodulose; posterior dominated by radial riblets these nodulose to spiny, anterior dominated by radial riblets these nodulose. Margin: Inner margin smooth. Ligament: Duplivincular, v-shaped ligament bands arising from posterior of dorsal area at first, then between beaks. Hinge: Taxodont, teeth, small, in two series separated by a short edentulous space, set on a narrow straight hinge plate; up to 7 anterior and 14 posterior teeth all angled obliquely. Pallial Musculature: Adductor scars unequal, anterior a little smaller than posterior. Periostracum: Thin, hyaline to pale straw coloured frills or bristles usually only persistent at margins. Colour: White, older shells brownish or greyish.
Distribution & Ecology
Continental Margin Zone (200 - 500m)
Bathyal (500 - 2000m)
Additional Information & Related Species
Key Features & Similar Species
Arcoidea : Arcidae
Listed are literature citing Asperarca nodulosa (Müller, 1776). Reference containing the species Type Description is highlighted.
La Perna R 1998. On Asperarca Sacco, 1898 (Bivalvia, Arcidae) and two new Mediterranean species. Bollettino Malacologico. 33: 11-18.
Müller O F 1776. Zoologiae Danicae Prodromus, seu Animalium Daniae et Norvegiae Indigenarum, characteres, nomina, et synonyma imprimis popularum Havniae (Copenhagen): Typis Hallageriis. 281pp.
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.
Oliver G & Allen J A 1980. The Functional and Adaptive Morphology of the Deep-Sea Species of the Arcacea (Mollusca: Bivalvia) from the Atlantic. Philosophical Transactions of the Royal Society of London Series B. 291: 45-76.
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