Petrochromis macrognathus

{{Short description|Species of fish}}

{{Speciesbox

| image =

| status = DD

| status_system = IUCN3.1

| status_ref = {{cite iucn |author=Bigirimana, C. |date=2006 |title=Petrochromis macrognathus |volume=2006 |page=e.T60655A12392087 |doi=10.2305/IUCN.UK.2006.RLTS.T60655A12392087.en |access-date=14 November 2021}}

| taxon = Petrochromis macrognathus

| authority = Yamaoka, 1983

| synonyms =

}}

Petrochromis macrognathus is a species of cichlid endemic to Lake Tanganyika found in areas with rocky substrates where it can graze on algae. This species can reach a length of {{convert|16.2|cm|in|abbr=on}}. It can be found in the aquarium trade.{{FishBase |genus= Petrochromis|species= macrognathus| month = April | year = 2013}}