Isadia

{{Short description|Extinct genus of fishes}}

{{Italic title}}

{{Automatic taxobox

| fossil_range = {{fossilrange|Middle Permian|Late Permian}}

| image =

| image_caption =

| taxon = Isadia

| authority = Minikh & Minikh, 1990

| subdivision_ranks = Species

| subdivision = See text

}}

Isadia is an extinct genus of prehistoric freshwater ray-finned fish from the order Eurynotoidiformes. It is known from the Permian of European Russia.{{Cite web |title=PBDB |url=https://paleobiodb.org/classic/basicTaxonInfo?taxon_no=203485 |access-date=2024-02-16 |website=paleobiodb.org}}{{Cite journal |last=Bakaev |first=A. S. |date=2022-12-01 |title=On the Revision of the Permian Ray-Finned Fishes of European Russia. Part 2 |url=https://doi.org/10.1134/S003103012206003X |journal=Paleontological Journal |language=en |volume=56 |issue=6 |pages=670–681 |doi=10.1134/S003103012206003X |issn=1555-6174|url-access=subscription }} The genus Amblypterina is partially considered a junior synonym of both Isadia and Kichkassia.

The following species are known:

• I. arefievi Minikh et al. 2015 {{Cite journal |last=Minikh |first=A. V. |last2=Arefiev |first2=M. P. |last3=Golubev |first3=V. K. |date=2015-11-01 |title=A new fish species of the genus Isadia (Actinopterygii, Eurynotoidiformes) from the new locality on the Malaya Northern Dvina river (terminal Permian, Vologda Region) |url=https://doi.org/10.1134/S0031030115060076 |journal=Paleontological Journal |language=en |volume=49 |issue=6 |pages=615–626 |doi=10.1134/S0031030115060076 |issn=1555-6174|url-access=subscription }}
• I. aristoviensis Minikh, 1990 (syn: Amblypterina grandicostata)
• I. suchonensis (Minikh, 1986) (syn: Amblypterina pectinata)