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| Cidaris Temporal range: | |
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| Cidaris cidaris | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Echinodermata |
| Class: | Echinoidea |
| Order: | Cidaroida |
| Family: | Cidaridae |
| Subfamily: | Cidarinae |
| Genus: | Cidaris Leske, 1778 |
| Type species | |
| Echinus cidaris , | |
| Synonyms | |
Dorocidaris Agassiz, 1869 | |
Cidaris is a genus of pencil sea urchins.
According to the World Register of Marine Species (WoRMS), the genus Cidaris contains the following extant species [1]
Carcharias is a genus of sand tiger sharks belonging to the family Odontaspididae. Once bearing many prehistoric species, all have gone extinct with the exception of the critically endangered sand tiger shark.
The false ark shells (Cucullaea) are a small genus of marine bivalve molluscs related to the ark clams. The genus is the only member of the family Cucullaeidae.
Ophiocomidae are a family of brittle stars of the suborder Ophiurina.
Coelopleurus is an extant genus of echinoids with fossil records dating back to the Eocene, with remains found in Europe and North America.
Echinus is a genus of sea urchins.
Cidaroida is an order of primitive sea urchins, the only living order of the subclass Perischoechinoidea. All other orders of this subclass, which were even more primitive than the living forms, became extinct during the Mesozoic.
Cidaridae is a family of sea urchins in the order Cidaroida.
Bolinopsidae is a family of ctenophores.
Clypeaster, common name "cake urchins" or "sea biscuits", is a genus of echinoderms belonging to the family Clypeasteridae.
Eucidaris is a genus of cidaroid sea urchins known as slate pencil urchins. 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.
Beroe, commonly known as the cigar comb jellies, is a genus of comb jellies in the family Beroidae. Beroe exhibits bioluminescence.
Aporocidaris is a genus of sea urchins in the family Ctenocidaridae. Several species are found in deep water in circum-Antarctic locations.
Histocidaris is a genus of sea urchins in the family Histocidaridae. Some species are known from the fossil record.
Cidaris elegans is a fossil species of pencil sea urchins in the family Cidaridae. It is known from the Oxfordian stage (Jurassic) of France.
Chiridota is a genus of sea cucumbers in the family Chiridotidae. It is an extant genus but some fossil species are known.
The pourtalesiids (Pourtalesiidae) are a family of irregular sea urchins that live in the deep sea. They are secondarily bilateral-symmetrical and like other representatives of the taxon Holasteroida they lack the lantern of Aristotle, which is typical for many other sea urchins. The genus Pourtalesia was named after Louis-François de Pourtalès who first collected these animals while dredging at a depth of 600 m. The family is known already from the Upper Cretaceous (Maastrichtian) and is distributed worldwide.
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.
Caenopedina is a genus of sea urchins of the family Pedinidae.
Brissopsis is a genus of echinoderms belonging to the family Brissidae.
Brisaster is a genus of echinoderms belonging to the family Schizasteridae.
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