Key to common families of bivalves in the Niagara region

2a) Shell always <50mm long and typically <20mm long. Interior of shell dull and usually greyish
in colour. SPHAERIIDAE




2b) Shell often >50mm long. Young animals may have green ray lines on shell. Interior of shells
shiny with white, purple, orange, or pink colours. Warts may be present on surface.
UNIONIDAE




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