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Mactromeris polynyma, Arctic surfclam(s)

Mactromeris polynyma (Stimpson, 1860)

Invalid synonym: Spisula polynyma

• Modern species: Eocene - Present (48.6 - 0.0 Ma)
• Habitat: Marine

• Classification
• kingdom Animalia, phylum Mollusca, class Bivalvia, family Mactridae, genus Mactromeris

• Distribution
• Miocene-Pliocene: Fukushima
• Pliocene: Hokkaido