Eutreptodactylus

{{Short description|Extinct genus of birds}}

{{Use dmy dates|date=July 2024}}

{{Speciesbox

| image =

| image_alt =

| image_caption =

| fossil_range = {{fossil range|53|50|Late Eocene (Itaboraian)}}

| genus = Eutreptodactylus

| species = itaboraiensis

| authority = Baird & Vickers-Rich, 1997{{cite journal |url=https://www.tandfonline.com/doi/abs/10.1080/03115519708619179 | doi=10.1080/03115519708619179 | title=Eutreptodactylus itaboraiensis gen. et sp. nov., an early cuckoo (Aves: Cuculidae) from the Late Paleocene of Brazil | date=1997 | last1=Baird | first1=Robert F. | last2=Vickers-Rich | first2=Patricia | journal=Alcheringa: An Australasian Journal of Palaeontology | volume=21 | issue=2 | pages=123–127 | bibcode=1997Alch...21..123B | url-access=subscription }}

| parent_authority = Baird & Vickers-Rich, 1997

| synonyms =

| synonyms_ref = {{citation needed|date=}}

}}

Eutreptodactylus is an extinct genus of insectivorous bird known from the Early Eocene period (Itaboraian) of Brazil. It was probably the most primitive member of the order Cuculiformes. Fossils have been found in the Itaboraí Formation at São José de Itaborai.{{Cite web |url=https://paleobiodb.org/classic/checkTaxonInfo?taxon_no=134403 |title=Fossilworks: Eutreptodactylus |access-date=17 December 2021 |archive-date=12 December 2021 |archive-url=https://web.archive.org/web/20211212185003/http://www.fossilworks.org/cgi-bin/bridge.pl?a=taxonInfo&taxon_no=134403 |url-status=live }}