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*’mussel’ is the common name used for members of several ‘families’ of [‘clams’ / ‘bi-valve molluscs’] from ‘saltwater’ + ‘freshwater’ habitats*
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(rhese groups have in common a shell whose outline is elongated and asymmetrical compared with other edible clams, which are often more or less rounded or oval)
The word “mussel” is most frequently used to mean the edible bivalves of the marine family Mytilidae, most of which live on exposed shores in the intertidal zone, attached by means of their strong byssal threads (“beard”) to a firm substrate.
A few species (in the genus Bathymodiolus) have colonised hydrothermal ventsassociated with deep ocean ridges.
In most marine mussels the shell is longer than it is wide, being wedge-shaped or asymmetrical.
The external colour of the shell is often dark blue, blackish, or brown, while the interior is silvery and somewhat nacreous.
The common name “mussel” is also used for many freshwater bivalves, including the freshwater pearl mussels.
Freshwater mussel species inhabit lakes, ponds, rivers, creeks, canals, and they are classified in a different subclass of bivalves, despite some very superficial similarities in appearance.
Freshwater zebra mussels and their relatives in the family Dreissenidae are not related to previously mentioned groups, even though they resemble many Mytilusspecies in shape, and live attached to rocks and other hard surfaces in a similar manner, using a byssus.
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(they are classified with the ‘heterodonta’, the ‘taxonomic group’ which includes most of the ‘bivalves’ commonly referred to as ‘clams’)
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*🌈✨ *TABLE OF CONTENTS* ✨🌷*
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