A family of freshwater crayfish found in the Northern Hemisphere, characterized by their large claws and crawling legs.
From Greek 'astakos' (crayfish) plus the scientific suffix '-idae' (family). The term entered scientific Latin in the 18th century when taxonomists were classifying crustaceans.
These crayfish are living fossils—species in this family have barely changed in millions of years, making them perfect study subjects for understanding how evolution works at extremely slow rates.
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