A genus of extinct brachiopods (small marine animals) from ancient seas.
From Greek a- (without) + trypan (to bore or perforate). Named for the absence of a hole (foramen) that other brachiopod shells possess, distinguishing this genus from related forms.
Atrypa shells filled ancient oceans for 200 million years but vanished completely in a mass extinction—today their fossils are among the most common shells you can find in Paleozoic rocks, a reminder of how dominant a species can be and still disappear completely.
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