''Parapteronotus hasemani'', the duckbill knifefish, is a species of

ghost knifefish The ghost knifefishes consist of the family Apteronotidae, which are ray-finned fishes in the order Gymnotiformes. These fish are native to Panama and South America. They inhabit a wide range of freshwater habitats, but more than half the specie ...

found in main river channels and along the margins in the

Amazon basin The Amazon basin is the part of South America drained by the Amazon River and its tributary, tributaries. The Amazon drainage basin covers an area of about , or about 35.5 percent of the South American continent. It is located in the countries ...

Brazil Brazil, officially the Federative Republic of Brazil, is the largest country in South America. It is the world's List of countries and dependencies by area, fifth-largest country by area and the List of countries and dependencies by population ...

and

Peru Peru, officially the Republic of Peru, is a country in western South America. It is bordered in the north by Ecuador and Colombia, in the east by Brazil, in the southeast by Bolivia, in the south by Chile, and in the south and west by the Pac ...

. It is the only member of the genus ''Parapteronotus''. This dark-colored knifefish reaches up to about in total length. Named in honor of John D. Haseman (1887-1969), field collector in the

Carnegie Museum of Natural History The Carnegie Museum of Natural History (abbreviated as CMNH) is a natural history museum in the Oakland (Pittsburgh), Oakland neighborhood of Pittsburgh, Pennsylvania. It was founded by List of people from the Pittsburgh metropolitan area, Pit ...

’s Department of Ichthyology from 1908 to 1911, who collected the type specimen.

References

Apteronotidae Monotypic ray-finned fish genera Fish of the Amazon basin Knifefish of Brazil Freshwater fish of Peru Fish described in 1913 Taxa named by James S. Albert {{Gymnotiformes-stub