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Is. of Scilly, England, UK, NE Atlantic
M010401

Is. of Scilly, England, UK, NE Atlantic
M010402

Is. of Scilly, England, UK, NE Atlantic
M010403

Is. of Scilly, England, UK, NE Atlantic
M010404
Arcopagia crassa (Pennant, 1777)
''
NMW Image No.

Arcopagia crassa (Pennant, 1777)

Tellinoidea : Tellinidae
Tebble name: Tellina (Arcopagia) crassa (Pennant)
Smith & Heppell name: Arcopagia crassa (Pennant, 1777)

To size: To 65mm. Shell Structure: Solid. Equivalve: Inequivalve, RV more convex than LV. Equilateral: Almost equilateral, beaks just behind midline. Tumidity: Not tumid. Outline: Broadly ovate with a slight flex in the posterior from the umbonal region. Lunule chestnut-brown depression with radial grooves. Escutcheon absent.

Sculpture: Evenly spaced concentric lines/grooves. Margin: Smooth. Ligament: Prominent dark brown band extending halfway to posterior margin. Hinge: 2 cardinals in each valve; in LV anterior bifid, in RV posterior bifid. Anterior and posterior lateral in both valves. Pallial Musculature: Pallial sinus deep, extending past the midline and angled towards the top of the anterior adductor.
Cruciform muscles sometimes visible towards posterior ventral margin near the end of the pallial line.
Periostracum: Thin, matt, yellow-brown. Colour: White/cream with orange/red-brown colouration at the umbones and extending as rays to the ventral margin. Internal white, with orange colouration in umbonal area and extending ventrally.



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Distribution & Ecology


A deep burrower mostly in clean, coarse sand and shell gravel. Widely distributed on all coasts from the low intertidal and across the shelf but generally uncommon beyond 100m depth.

Depth Range
Intertidal
Continental Shelf (to 200m)


Juveniles & Similar Species

Juvenile Description
Juveniles are distinctly expanded anteriorly, more ovate than circular.

Key Features & Similar Species
Arcopella balustina is the only other subcircular tellin here and differs in having a thin shell and the co-marginal sculpture of thin slightly crispate lamellae; the pallial sinus is discrepant being much larger in the left valve.

Additional Comments

Tellinoidea : Tellinidae

References


Listed are literature citing Arcopagia crassa (Pennant, 1777). Reference containing the species Type Description is highlighted.
Pennant T 1777. British Zoology vol.IV. Crustacea, Mollusca, Testacea London, B. White. 154pp, 93pls.

Resources


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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