A genus of small marine snails characterized by a notch or emargination in their shell aperture.
From emarginate plus the diminutive Latin suffix -ula (making it 'little emargination'). This is a scientific taxon name in malacology (the study of mollusks), coined to describe the distinctive notched shells.
These tiny snails are so abundant in ocean sediments that paleontologists use them to identify different geological time periods—an entire era of Earth's history is written in the shells of creatures most people have never heard of!
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