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Porcupine exp 1869 : 664fm
M011531

Porcupine exp 1869
M011532

Porcupine exp 1869 : 664fm
M012880
Allogramma formosa (Jeffreys, 1881)
''
NMW Image No.

Allogramma formosa (Jeffreys, 1881)

Pandoroidea : Lyonsiidae
Tebble name: n/a
Smith & Heppell name: Lyonsia formosa Jeffreys, 1881

To size: To 15mm. Shell Structure: Thin, fragile. Equivalve: Equivalve. Equilateral: Inequilateral, beaks slightly in front of midline. Tumidity: Moderate. Outline: Subrectangular; anterior rounded, posterior truncate, ventral margin gently curved, dorsal margins long sloping gently. Contour: Umbos prominent; posterior area set off by a radial carina running from the beaks to the posterior ventral junction.

Sculpture: Anterior area with few oblique weak ridges, anterior and median areas with dense, radial rows of minute spines, these larger on dorsal anterior area; posterior area with radial riblets bearing spines, these becoming larger on dorsal area and projecting above the margin. Margin: Inner margin smooth. Ligament: Small, set on a shallow internal lithodesma below the beaks. Hinge: Lacking teeth. Pallial Musculature: Obscure. Periostracum: Obscure. Colour: White.



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Distribution & Ecology


Mostly from lower slope and abyssal depths, widely distributed in the North Atlantic including Rockall Trough and Porcupine Bight.

Depth Range
Bathyal (500 - 2000m)
Abyssal Rise (2000 - 4000m)


Juveniles & Similar Species

Juvenile Description
Small shells are more trapezoidal in outline, the anterior distinctly narrower than posterior.

Key Features & Similar Species

Additional Comments

Pandoroidea : Lyonsiidae

References


Listed are literature citing Allogramma formosa (Jeffreys, 1881). Reference containing the species Type Description is highlighted.
Jeffreys J.G. 1881. On the Mollusca procured during the ‘Lightning’ and ‘Porcupine’ Expeditions, 1868-70. (Part III). Proceedings of the Zoological Society of London. 1881: 693-724.
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.

Resources


Downloads

Weblinks

  • Conchological Society of Great Britain & Ireland
    Provides resources for understanding, identifying, recording, and conserving molluscs
  • CLEMAM
    Check List of European Marine Mollusca
  • MarLIN
    The Marine Life Information Network for Britain and Ireland (MarLIN) provides information for marine environmental management, protection and education. It is a centre of excellence in spatially based and time-series marine biological information and supports good stewardship in the marine environment.
  • NBN Gateway
    National Biodiversity Network's Gateway. Use it to explore UK biodiversity data, as contributed by participating data providers.
  • BivAToL
  • MarBEF
  • Malacological Society
  • Unitas Malacologica
  • Census of Marine Life
  • MarBEF
    MarBEF, a network of excellence funded by the European Union and consisting of 94 European marine institutes, is a platform to integrate and disseminate knowledge and expertise on marine biodiversity, with links to researchers, industry, stakeholders and the general public.

Record last modified - 15/01/2014