Argennina is a spider genus with a single species, Argennina unica, found in the southern United States. Individuals are around 5 mm (0.20 in) in body length. The carapace is a pale yellow brown, sparsely covered with short black hairs, and the abdomen is gray to pale yellow with fine pale hairs. The species was described in 1936 by Willis J. Gertsch and Stanley Mulaik, and is known from Texas.