It is found in the eastern Atlantic Ocean, the Caribbean Sea and the Gulf of Mexico.

The aboral (upper) surface has a single row of large marginal plates around the edges of the arms.

[2][3] Astropecten duplicatus is native to the eastern Atlantic Ocean, the Caribbean Sea and the Gulf of Mexico.

Its range extends from Cape Hatteras, Florida, Cuba and the Bahamas to Mexico, Colombia, Venezuela and Guyana.

[1] It is found on sand or other soft sediments and in seagrass meadows at depths down to about 500 metres (1,600 ft).