# Parapteronotus

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{{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](/source/James_S._Albert), 2001
| display_parents = 2
| authority = ([M. M. Ellis](/source/Max_Mapes_Ellis), 1913)
| synonyms = {{Specieslist
| Sternarchus hasemani | M. M. Ellis, 1913
| Apteronotus anas | [C. H. Eigenmann](/source/Carl_H._Eigenmann) & [W. R. Allen](/source/William_Ray_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](/source/ghost_knifefish) found in main river channels and along the margins in the [Amazon basin](/source/Amazon_basin) of [Brazil](/source/Brazil) and [Peru](/source/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](/source/John_Diederich_Haseman) (1887-1969), field collector in the [Carnegie Museum of Natural History](/source/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

{{Gymnotiformes-stub}}

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Adapted from the Wikipedia article [Parapteronotus](https://en.wikipedia.org/wiki/Parapteronotus) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Parapteronotus?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.