Thelphusa
noun
Thel·phu·sa
thelˈfyüsə
: a genus (the type of the family Thelphusidae) of freshwater crabs living in or on river banks in warm countries
thelphusian
adjective or noun
(ˈ)thel¦fyüsēən
-üshən
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Merriam-Webster unabridged
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