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22 hydraena species
Hydraena americana
Hydraena pensylvanica
Hydraena gracilis
Hydraena marginicollis
Hydraena testacea
Hydraena riparia
Hydraena palustris
Hydraena nigrita
Hydraena britteni
Hydraena circulata
Hydraena atlantica
Hydraena pulsatrix
Hydraena angulicollis
Hydraena appalachicola
Hydraena leechi
Hydraena maureenae
Hydraena nigra
Hydraena occidentalis
Hydraena pacifica
Hydraena petila
Hydraena vandykei
Hydraena arizonica
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