Plural of atremate; a group of brachiopods (small marine shellfish) lacking pores or openings in their shells.
From prefix 'a-' meaning 'without' plus Greek 'trema' meaning 'hole' or 'opening,' creating a zoological classification term.
Atremata brachiopods are ancient creatures that have barely changed in hundreds of millions of years — they're sometimes called 'living fossils' because they look virtually the same as their fossil ancestors!
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