noun
a type of fish belonging to the family Acipenseridae, which includes sturgeons and paddlefish
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The acipenserid family includes sturgeons, which are known for their long lifespans.
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I read that acipenserids can live for over 100 years!
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Those acipenserids are like the grandpas of the fish world, living so long.
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The acipenserid's ancient lineage is like a living fossil in the modern world.