Hydraena (Hydraenopsis) unita Perkins, 2011
Hydraena unita Perkins, 2011: 47 .
Hydraena (Hydraenopsis) unita Perkins: Trizzino et al. 2013: App. 1.
DISTRIBUTION: Currently known from Brazil (Mato Grosso State) and northern Paraguay.
HABITAT RECORDS: “River section” is the only available data (Perkins 2011).