Amethyst gem clam
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| iAmethyst gem clam | ||||||||||||||
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| Gemma gemma Totten, 1834 | ||||||||||||||
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Gemma purpurea Lea, 1842 |
The amethyst gem clam (Gemma gemma) is one of the smallest known species of clam, reaching length of only 5 mm <ref>Sellmer, G P (1967). Functional morphology and ecological life history of the gem clam, Gemma gemma (Eulamellibranchia: Veneridae). Malacologia 5: 37–233.</ref>. It is native to the Atlantic coast of North America, from Labrador to Texas <ref>NOAA. Amethyst gem clam (Gemma gemma). Retrieved on March 25, 2006.</ref>, but is now also found in some locations on the Pacific coast <ref>Kaustuv R, D Jablonski & J W Valentine. Climate change, species range limits and body size in marine bivalves. Ecology Letters 4: 366–370.</ref>.
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