Pentaster

{{Short description|Genus of starfishes}}

{{Automatic taxobox

| image = Pentaster obtusatus.jpg

| image_caption = Pentaster obtusatus

| taxon = Pentaster

| authority = Döderlein, 1935 {{ cite web |url=http://www.marinespecies.org/asteroidea/aphia.php?p=taxdetails&id=292768 |author=C.L. Mah |title=Asteroidea taxon details for Pentaster Döderlein, 1935 |year=2010 |work=World Asteroidea Database |accessdate=June 29, 2011}}

| subdivision_ranks = Species

| subdivision = See text.

}}

Pentaster is a genus of sea stars in the family Oreasteridae. It is also known as the Blunt Arm Sea Star.{{Cite web|url=https://eol.org/pages/4704972|title = Blunt Arm Sea Star - Encyclopedia of Life}}