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Additional
Unionoida
English Wikipedia - The Free Encyclopedia
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Unionoida
Unionoida
is an
monophyletic
order
of
freshwater mussels
,
aquatic
bivalve
mollusk
s. The order includes most of the larger freshwater mussels, including the
freshwater pearl mussels
. The most common families are the
Unionidae
and the
Margaritiferidae
. All have in common a larval stage that is temporarily
parasitic
on fish,
nacreous
shells, high in organic matter, that may crack upon drying out, and
siphons
too short to permit the animal to live deeply buried in sediment.
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