The Micropygidae form a family of sea urchins within the Diadematoida order of echinoderms. The family contains two living species of the genus Micropyga and one, Kierechinus, known only from fossils.[1] Morphologically, they are quite flat and have short, sharp spines, which are close to each other. They occur in the Indian and Pacific Oceans.
| Genus | Author genus | Species | Author species | Age |
|---|---|---|---|---|
| Kierechinus | Philip, 1963 | K. melo | (Kier, 1957) | Ypresian |
| Micropyga | Agassiz, 1879 | M. tuberculata | Agassiz, 1879 | extant |
| M. violacea | de Meijere, 1903 | extant | ||