Jacobulus

{{Short description|Extinct genus of fishes}}

{{Automatic taxobox

| fossil_range = {{fossilrange|252|247|Early Triassic 252.3-251.3 mya{{cite journal|last=Sepkoski |first=Jack |title=A compendium of fossil marine animal genera |journal=Bulletins of American Paleontology |volume=364 |page=560 |year=2002 |url=http://strata.ummp.lsa.umich.edu/jack/showgenera.php?taxon=611&rank=class |accessdate=2009-02-27 |url-status=dead |archiveurl=https://web.archive.org/web/20110723131237/http://strata.ummp.lsa.umich.edu/jack/showgenera.php?taxon=611&rank=class |archivedate=July 23, 2011 }}}}

| image = Jacobulus.png

| image_caption = Jacobulus novus type

| taxon = Jacobulus

| authority = Lehman, 1952

| type_species = {{extinct}}Jacobulus novus

| type_species_authority = Lehman, 1952

}}

Jacobulus is an extinct genus of prehistoric ray-finned fish that lived during the Early Triassic epoch in what is now northern Madagascar 252.3 to 251.3 million years ago.{{Cite web |title=Fossilworks: Jacobulus |url=https://paleobiodb.org/classic/checkTaxonInfo?taxon_no=35202 |access-date=2022-07-03 |website=Paleobiology Database}} The type species is Jacobulus novus (monotypy). It was a small fish less than {{convert|10|cm|in}} in length. J. novus ecology was a grazer-detritivore. It belongs to the Parasemionotidae together with Albertonia, Candelarialepis, Icarealcyon, Lehmanotus, Parasemionotus, Qingshania, Stensioenotus, Suius, Thomasinotus, and Watsonulus.