Actinoptychus

{{Short description|Genus of diatoms}}

{{Automatic taxobox

| image = Actinoptychus splendens.jpg

| image_caption = Fossil of Actinoptychus splendens

| taxon = Actinoptychus

| authority = Ehrenberg, 1843

| subdivision_ranks = Extant species

| subdivision =

• Actinoptychus octodenarius
• Actinoptychus senarius

| subdivision_ref =

}}

Actinoptychus is a genus of diatoms belonging to the family Heliopeltaceae.{{AlgaeBase genus|name=Actinoptychus|id=43721}}

The genus was described in 1843 by Christian Gottfried Ehrenberg.

Species:

• Actinoptychus octodenarius Ehrenberg{{IRMNG | 1103727 | Actinoptychus | 27 July 2021 }}
• Actinoptychus senarius (Ehrenberg) Ehrenberg, 1843