A genus or group of marine mollusks characterized by their arc-shaped shells, part of the bivalve family.
From Latin 'arcta' (narrow, close) or from Greek 'arktos' (bear) combined with the Latin diminutive suffix '-alia'. The taxonomic naming reflects the shell's curved or constrained appearance.
These ancient shellfish have been hiding in ocean sediments for millions of years—scientists can use their fossils to understand what oceans were like in prehistoric times because different species preferred different temperatures and depths.
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