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Shellness, Kent, England, UK, NE Atlantic
M010345

Shellness, Kent, England, UK, NE Atlantic
M010346

Shellness, Kent, England, UK, NE Atlantic
M010347

Shellness, Kent, England, UK, NE Atlantic
M010348

Reculvers[?]
M010564

Reculvers[?]
M010565
Petricola pholadiformis Lamarck, 1818
''
NMW Image No.

Petricola pholadiformis Lamarck, 1818

Veneroidea : Petricolidae
Tebble name: Petricola pholadiformis Lamarck
Smith & Heppell name: Petricola pholadiformis Lamarck, 1818

To size: To 64mm. Shell Structure: Thin, fragile shell. Equivalve: Equivalve. Equilateral: Inequilateral. Beaks in front of midline. Tumidity: Not tumid. Outline: Elongate oval. Lunule not well-developed. Radiating ridges distinguish it from rest of shell. Escutcheon absent.

Sculpture: Radial ribs which, in the anterior, are developed into rib-like lamellae at the concentric lines. Margin: Smooth. Ligament: Inset, but highly visible, chesnut brown in colour. Runs almost to the end of the dorsal margin. Hinge: 3 cardinals in LV, the central is bifid and hooks from under the umbo, not on hinge plate. 2 cardinals in RV, posterior is bifid, the anterior originates beneath umbo and is hook-like. Pallial Musculature: Pallial sinus deep, extending past the midline. Periostracum: Thin, matt. Colour: White/cream.



Distribution map legend
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Distribution & Ecology


Petricola pholadiformis was introduced not later than 1890 (Naylor 1957) and found in the River Crouch, Essex International Council for the Exploration of the Sea; 1972, Tebble 1976).
The species is native to the USA and was introduced from there. It is established along south and east coasts of England from Lyme Regis, Dorset, to the Humber, Humberside (Duval 1963; J. Light & I. Killeen pers. comm.), where it is found living in clay, peat or soft rock shores. It is most common off Essex and the Thames estuary e.g. the River Medway (see Bamber 1985). European populations occur from southern Norway to the Mediterranean and Black Seas (Tebble 1976).
Atlas shows records from other locations outside range shown on map.but IJK does not think that these are established. Bores into hard clay, chalk, stiff mud, peat-moss or limestone.

Depth Range
Intertidal


Juveniles & Similar Species

Juvenile Description

Key Features & Similar Species

Additional Comments

Veneroidea : Petricolidae

References


Listed are literature citing Petricola pholadiformis Lamarck, 1818. Reference containing the species Type Description is highlighted.
Lamarck J B P A de M 1818. Histoire naturelle des Animaux sans vertèbres 5. Paris. 612pp.
Purchon, R D 1955. The functional morphology of the rock-boring lamellibranch Petricola pholadiformis Lamarck. 34: 257-278.

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 - 05/03/2014