plural noun
Pot·​a·​mon·​i·​dae | \ˌpätəˈmänəˌdē\

Definition of Potamonidae 

: a family of freshwater crabs (superfamily Brachyrhyncha) whose young undergo metamorphosis in the egg and hatch as miniature adults — see river crab

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History and Etymology for Potamonidae

New Latin, from Potamon, type genus (from Greek potamos river) + -idae

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