Heart cockle shells in natural light (top row) and illuminated from within to show the transparent shell windows, which vary from little triangles to stripes to mosaics. Credit: Dakota McCoy A team of ...
Many animals convergently evolved photosynthetic symbioses. In bivalves, giant clams (Cardiidae: Tridacninae) gape open to irradiate their symbionts, but heart cockles (Cardiidae: Fraginae) stay ...
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