Английская Википедия:Hyolithelmintida
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Шаблон:Short description Шаблон:Automatic taxobox
Hyolithohelminths are phosphatic tubular fossils from the Cambrian period. They were sedentary, possibly infaunal, organisms; once thought to have opercula (hence the comparison with hyoliths), these structures are now understood to be unrelated shells.[1]
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