Archichthys

{{Short description|Genus of fishes}}

{{Automatic taxobox

| fossil_range = Carboniferous

| taxon = Archichthys

| authority = Hancock and Atthey, 1870

| type_species = †Archichthys portlockii

| type_species_authority = Portlock, 1843

| subdivision_ranks = Synonyms

| subdivision =

• Strepsodus sulcidens Hancock and Atthey, 1870
• Archichthys sulcidens Hancock and Atthey, 1870

}}

Archichthys is a genus of rhizodont lobe-finned fish that lived throughout the Carboniferous period. Fossils have been found in Northern Ireland and England.{{cite journal|last=Jeffery|first=Jonathan E.|year=2006|title=The Carboniferous fish genera Strepsodus and Archichthys (Sarcopterygii: Rhizodontida): Clarifying 150 years of confusion|journal=Palaeontology|volume=49|issue=1|pages=113–132|doi=10.1111/j.1475-4983.2005.00531.x|doi-access=free|bibcode=2006Palgy..49..113J }}