Pterotrigonia

{{Short description|Extinct genus of bivalves}}

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

{{Automatic taxobox

| image = Megatrigoniidae - Pterotrigonia caudata.JPG

| image_alt =

| image_caption = Pterotrigonia caudata fossil from the Isle of Wight at Galerie de paléontologie et d'anatomie comparée, Paris

| fossil_range = {{fossil range|164.7|66.043|Jurassic to Cretaceous}}

| display_parents = 3

| taxon = Pterotrigonia

| authority = van Hoepen, 1929van Hoepen, E. C. N. (1929). Die krytfauna van Soeloeland. 1, Trigoniidae. Paleontologiese Navorsing van die Nasionale Museum van Bloemfontein. 1(1):1–38. page(s): 9

| type_species = {{extinct}}Pterotrigonia cristata

| type_species_authority = van Hoepen, 1929

| subdivision_ranks = Species

| subdivision_ref =MolluscaBase eds. (2024). MolluscaBase. Pterotrigonia van Hoepen, 1929 †. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=852418 {{Webarchive|url=https://web.archive.org/web/20240215191843/https://www.marinespecies.org/aphia.php?p=taxdetails&id=852418 |date=15 February 2024 }} on 25 July 2024

| subdivision =

• {{extinct}}Pterotrigonia cristata van Hoepen, 1929
• {{extinct}}Pterotrigonia flava M. Griffin & Varela, 2012
• {{extinct}}Pterotrigonia jubata van Hoepen, 1929
• {{extinct}}Pterotrigonia setosa van Hoepen, 1929

| synonyms =

• {{extinct}}Pterotrigonia (Pterotrigonia) van Hoepen, 1929 superseded rank

| synonyms_ref =

}}

Pterotrigonia is an extinct genus of saltwater clams, marine bivalve molluscs in the family Megatrigoniidae. This genus is known in the fossil record from the Jurassic period Tithonian age to the Cretaceous period Maastrichtian age. Species in this genus were facultatively mobile infaunal suspension feeders. The type species of the genus is Pterotrigonia cristata.

Pterotrigonia thoracica was selected as the state fossil of Tennessee in 1998.

Scabrotrigonia is a subgenus of Pterotrigonia.{{cite journal |last1=Tashiro |first1=M |last2=Matsuda |first2=T. |year=1983 |title=A study of the Pterotrigoniae from Japan |journal=Memoirs of the Faculty of Science, Kochi University, Series e, Geology |volume=4 |pages=13–52 |url=https://kochi.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2256&item_no=1&attribute_id=17&file_no=1 |access-date=25 October 2021 |archive-date=25 October 2021 |archive-url=https://web.archive.org/web/20211025172309/https://kochi.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2256&item_no=1&attribute_id=17&file_no=1 |url-status=live }}{{cite journal |last1=Leanza |first1=H.A. |year=1996 |title=Jurassic trigoniaceans from Argentina: A review |journal=Georesearch Forum |volume=1 |pages=67–78 |url=https://www.researchgate.net/publication/262910798 |access-date=25 October 2021}}