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Schindler, I.; Staeck, W. (2013). Description of Apistogramma helkeri sp. n., a new geophagine dwarf cichlid (Teleostei: Cichlidae) from the lower río Cuao (Orinoco drainage) in Venezuela. Vertebrate Zoology. 63(3): 301-306.
Schindler, I.; Staeck, W. (2013). Description of Apistogramma helkeri sp. n., a new geophagine dwarf cichlid (Teleostei: Cichlidae) from the lower río Cuao (Orinoco drainage) in Venezuela. Vertebrate Zoology. 63(3): 301-306.
