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Macoma balthica (Linnaeus, 1758)

Author: Steve Wilkinson on 5 December 2009

Description

Solid shell up to about 2.5 cm in length. Colour variable including white, yellow and pink, usually with darker concentric bands. Surface smooth and glossy with very fine concentric lines.

Key identification features

  • Solid shell
  • Globular when viewed from the end
  • Lower margin of pallial line confluent with the pallial sinus

Ecology

Found in mud, muddy sand and muddy gravel where it can occur in densities up to about 2000 per square metre. Lies burried on its side with long sipons protruding. Able to tolerate reduced salinities and as result in often common in estuaries.

Distribution and status

CommonNorway south to the Iberian Peninsula and into the Baltic Sea.

Left valve of Macoma balthica
Image ©

Steve Wilkinson

Additional images

  • Inside of left valve of Macoma balthica
  • Right valve of Macoma balthica

All images copyright of the photographer - see "View image details".

Recorded UK distribution