11 species (see text) Meridiastra is a genus of star fish in the family Asterinidae.

[2][3] The genus is found in the Indian and Pacific Oceans,[4] with most records from the waters around Australia.

Meridiastra are morphologically similar to the Atlantic genus Asterina.

[4] The generic name is derived from the Latin meridies (=south) and astrum (=star), in reference to the southern Australian and Pacific distribution of the genus[1] (at the time of description – the genus now includes also species occurring on the northern hemisphere (Mexico, Panama)[4]).

The interradial margin is straight to incurved; when the rays are distinct, they have narrowly rounded to pointed tips.