Distribution in Scandinavian waters
Maximum length: 12,7 cm.
Appearance: The shell is round and very thick. The
brown-black surface layer is usually worn away when the
shell is washed up on to the beach.
Depth: 2 - 200 m.
Environment: Lives usually dug
down into the sandy or clayey bottoms. The shell is quite common
on the beach.
Misc: Black clams grow slowly and can be very old. In the Gullmarsfjord
(Swedish west coast) an individual has been found that was 132 years
old. The worm pomatoceros
trqueter is seen on the shells pictured above.
Classification: The black clam is part of bivalve
group under the molluscs.