Template:POTD/2012-11-25
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|image=Triops-longicaudatus-dorsal-ventral-edit2.jpg
|size=280
|title=Longtail tadpole shrimp
|texttitle=Longtail tadpole shrimp
|caption=The longtail tadpole shrimp (Triops longicaudatus) is a freshwater crustacean resembling a miniature horseshoe crab. It is one of the oldest animal species still in existence. Like its relative Triops cancriformis, the longtail tadpole shrimp is considered a living fossil because its basic prehistoric morphology has changed little in the last 70 million years, exactly matching ancient fossils.
|credit=Photo: Micha L. Rieser
}}
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