Cidaroida genera

Cidaris is a genus of pencil sea urchins.

Stylocidaris is a genus of echinoderms belonging to the family Cidaridae.

Eucidaris is a genus of cidaroid sea urchins known as slate pencil urchins (named after slate pencil). They are characterised by a moderately thick test, a usually monocyclic apical disc, perforate and non-crenulate tubercles and nearly straight ambulacra with horizontal pore pairs. The primary spines are few and widely spaced, stout with blunt flat tips and beaded ornamentation and the secondary spines are short and apressed. They originated in the Miocene and extant members of the genus are found in the tropical Indo-Pacific Ocean, East Pacific, Atlantic Ocean and Caribbean Sea.

Prionocidaris is a genus of echinoderms belonging to the family Cidaridae.

Histocidaris is a genus of sea urchins in the family Histocidaridae. Some species are known from the fossil record.

Goniocidaris is a genus of sea urchins (Echinoidea) in the family Cidaridae and typical of the subfamily Goniocidarinae. Extant species are mostly found in Indo-Pacific seas, often living at depth.

Stereocidaris is a genus of echinoderm belonging to the family Cidaridae.

Acanthocidaris is a genus of echinoderms belonging to the family Cidaridae.

Tylocidaris is an extinct genus of sea urchins that lived from the Early Cretaceous to the Eocene. Its remains have been found in Europe and North America.

Chondrocidaris is a genus of sea urchins of the family Cidaridae described in 1863 by Alexander Agassiz. There are two living species and several fossil species dating as far back as the Miocene.

Notocidaris is a genus of echinoderms belonging to the family Ctenocidaridae.

Plegiocidaris is an extinct genus of echinoids that lived from the Triassic to the Early Cretaceous. Its remains have been found in Asia and Europe. It was named by the paleontologist Auguste Pomel.

Archaeocidaris is an extinct genus of echinoid that lived from the Late Devonian to the Late Permian. Its remains have been found in Africa, Europe, and North America. thumb|left|Archaeocidaris plates and spines from the Bird Spring Formation (Carboniferous) exposed in Kyle Canyon, Spring Mountains, southern Nevada.

Austrocidaris is a genus of sea urchins belonging to the family Cidaridae.

Temnocidaris is an extinct genus of echinoids that lived from the Late Cretaceous to the Paleocene. Its remains have been found in Europe and North America.