Potamonidae
plural noun
Pot·a·mon·i·dae
ˌpätəˈmänəˌdē
: a family of freshwater crabs (superfamily Brachyrhyncha) whose young undergo metamorphosis in the egg and hatch as miniature adults see river crab
Word History
Etymology
New Latin, from Potamon, type genus (from Greek potamos river) + -idae