Two new Surinam species of Hypostomus Lacépède are described, and their relationship is discussed; a group of three forms from eastern Surinam and (French) Guyane (gymnorhynchus-complex) is reconsidered; the species H. plecostomus (Linnaeus) is reported to hitherto survive in the lacustrine environment of the Brokopondo Lake.

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Journal Beaufortia
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Boeseman, M. (1969). Additional new species of Hypostomus Lacépède, 1803, from Surinam; with remarks on the apparent „gymnorhynchus-complex” (Siluriformes, Loricariidae). Beaufortia, 16(215), 119–136.