{{Short description|Genus of fishes}} {{Speciesbox | image = | image_caption = | status = LC | status_system = IUCN3.1 | status_ref = <ref name = iucn>{{cite iucn |author=Frederico, R.G. |year=2022 |title=''Parapteronotus hasemani'' |article-number=e.T49830283A160187167 |doi=10.2305/IUCN.UK.2022-2.RLTS.T49830283A160187167.en |access-date=25 May 2025}}</ref> | taxon = Parapteronotus hasemani | parent_authority = Albert, 2001 | display_parents = 2 | authority = (M. M. Ellis, 1913) | synonyms = {{Specieslist | Sternarchus hasemani | M. M. Ellis, 1913 | Apteronotus anas | C. H. Eigenmann & W. R. Allen, 1942 }} | synonyms_ref =<ref name = "Cof genus">{{Cof genus|genus=Parapteronotus|access-date=25 May 2025}}</ref> }}
'''''Parapteronotus hasemani''''', the '''duckbill knifefish''', is a species of ghost knifefish found in main river channels and along the margins in the Amazon basin of Brazil and Peru. It is the only member of the genus '''''Parapteronotus'''''. This dark-colored knifefish reaches up to about {{convert|38|cm|in|abbr=on}} in total length.<ref name=Sleen2017>{{cite book | editor1=van der Sleen, P. | editor2=J.S. Albert | year=2017 | title=Field Guide to the Fishes of the Amazon, Orinoco, and Guianas | publisher=Princeton University Press | page=328 | isbn=978-0-691-17074-9 }}</ref><ref name=fishbase>{{FishBase |genus= Parapteronotus|species= hasemani| month = October| year = 2017 }}</ref>
Named in honor of John D. Haseman (1887-1969), field collector in the Carnegie Museum of Natural History's Department of Ichthyology from 1908 to 1911, who collected the type specimen.<ref name = ETYFish>{{cite web | url = http://www.etyfish.org/gymnotiformes/ | title = Order GYMNOTIFORMES (Neotropical Knifefishes) | access-date = 7 March 2021 | author1 = Christopher Scharpf | author2 = Kenneth J. Lazara | name-list-style = amp | work = The ETYFish Project Fish Name Etymology Database | publisher = Christopher Scharpf and Kenneth J. Lazara | date = 22 September 2018 | archive-date = 7 February 2022 | archive-url = https://web.archive.org/web/20220207065141/http://etyfish.org/gymnotiformes/ | url-status = dead }}</ref>
==References== {{Reflist}}
{{Taxonbar|from1=Q18663463|from2=Q6406544}}
Category:Apteronotidae Category:Monotypic Actinopterygii genera Category:Fish of the Amazon basin Category:Knifefish of Brazil Category:Freshwater fish of Peru Category:Fish described in 1913 Category:Taxa named by James S. Albert
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