Ancistrus piriformis
{{Short description|Species of catfish}}
{{Speciesbox
| taxon = Ancistrus piriformis
| authority = Muller, 1989
}}
Ancistrus piriformis is a species of catfish in the family Loricariidae.{{Cite web |title=ITIS - Report: Ancistrus piriformis |url=https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=680029 |access-date=2022-04-12 |website=www.itis.gov}} It is native to South America, where it occurs in the Acaray River basin, which is part of the ParanĂ¡ River drainage in Paraguay, although it has also been reported from Argentina. The species reaches 8.3 cm (3.3 inches) SL.{{Cite web |date=2022 |editor-last=Froese |editor-first=Rainer |editor2-last=Pauly |editor2-first=Daniel |title=Ancistrus piriformis |url=https://www.fishbase.de/summary/53587 |website=FishBase}}