Key to common families of bivalves in Spencer Creek

1a) Shell triangular in shape. May rest on flattened ventral edge that contains a small pore through
which attachment threads protrude. A pattern of brownish strips typically evident on shell.
DREISSENIDAE




1b) Shell more ovoid or eliptical in shape. Ventral edge not flattened, no attachment thread
protrude from shell. Shell rests on side only. Shells seldom patterned (green ray lines may be
present). 2




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