Uca sp.
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Uca sp.
Male.
Brasil, Rio Grande do Norte, Baía Formosa.
11/27/2011
IS007'01-111127106'JJK
Det. José Roberto Pujol Luz
The genus Uca shows strong sexual dimorphism manifested by extensive development of one of male's claws. Large claw, that represents almost a half of body weight, is used for territorial fighting and for a waving display.