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Eucidaris tribuloides is a species of cidaroid sea urchin found in the Caribbean Sea and western Atlantic Ocean, first described by Jean-Baptiste Lamarck in 1816. Commonly known as the slate pencil urchin, it has thick, blunt spines typical of cidaroids, a group considered morphologically primitive...
Phyllacanthus imperialis is an Indo-Pacific pencil urchin described by Lamarck in 1816, recognized by thick blunt primary spines.
Eucidaris galapagensis is a Galapagos slate-pencil urchin described by Döderlein in 1887, often separated from Eucidaris thouarsii.
Eucidaris thouarsii is an eastern Pacific slate-pencil urchin described by Agassiz and Desor in 1846, ranging from Baja California to Panama.
Cidaris cidaris is a deep-water pencil urchin described by Linnaeus in 1758, found in the eastern Atlantic and Mediterranean Sea.
Eucidaris metularia is an Indo-Pacific cidaroid sea urchin described by Lamarck in 1816, known for sparse banded, flat-tipped spines.
Prionocidaris baculosa is an Indo-West Pacific cidaroid sea urchin described by Lamarck in 1816, with massive epibiont-bearing spines.
Tylocidaris clavigera is an extinct cidaroid sea urchin species in a genus known from Early Cretaceous to Eocene deposits in Europe and North America.
Archaeocidaris brownwoodensis is a Carboniferous fossil cidaroid sea urchin, often illustrated as about 300 million years old in echinoid history.
Chondrocidaris gigantea is a rough-spined Indo-Pacific cidaroid urchin described by Alexander Agassiz in 1863, found around Hawaii.
Stylocidaris affinis is a pencil urchin described by Philippi in 1845, occurring in the Mediterranean, Caribbean, Bermuda, and Gulf of Mexico.
Dorocidaris papillata is a former name of Cidaris cidaris, the long-spine slate pen urchin described by Leske in 1778 from Atlantic waters.
Rhabdocidaris nobilis is an extinct cidaroid sea urchin recorded from the Canjuers Lagerstatte in France, a Late Jurassic fossil site.
Plegiocidaris coronata is an extinct cidaroid sea urchin species in Plegiocidaris, a genus named by Pomel in 1883 and known from Triassic to Early Cretaceous fossils.
Goniocidaris parasol is a New Zealand deep-sea cidaroid urchin described by Fell in 1958, named among the parasol-spined goniocidarids.
Phyllacanthus parvispinus is an eastern Australian and New Zealand pencil urchin described by Tenison-Woods in 1878.
Miocidaris coaeva is a Triassic fossil cidaroid sea urchin, notable from about 240 million years ago near the survival line of modern cidaroids.
Histocidaris elegans is a histocidarid sea urchin first described by Alexander Agassiz in 1879 and once classified as Porocidaris elegans.
Ctenocidaris speciosa is an Antarctic ctenocidarid sea urchin described by Mortensen in 1910, in a genus noted for serrated primary spines.
Goniocidaris tubaria is an Australian and New Zealand cidaroid urchin described by Lamarck in 1816, notable for trumpet-like spine tips.
Stylocidaris lineata is a cidaroid sea urchin described by Mortensen in 1910, one of the accepted species in the deep-water genus Stylocidaris.
Austrocidaris canaliculata is a cidarid sea urchin from the southern Pacific region, first described by Alexander Agassiz in 1863.
Acanthocidaris maculicollis is a cidaroid named by de Meijere in 1904 from Indonesia's Sunda Islands, where it was collected at 69 to 94 metres.
Stylocidaris briareus is not a name I could verify in current major sea urchin lists; Stylocidaris itself was established by Mortensen in 1909.
Calocidaris micans is a Central American cidarid sea urchin described by Mortensen in 1903 and known among predators of stalked crinoids.
Cidaris blakei is a deep-water Gulf of Mexico cidaroid urchin described by Alexander Agassiz in 1878, notable for paddle-like spines.
Ctenocidaris nutrix is an Antarctic cidaroid described by Charles Wyville Thomson in 1876 and placed in a genus distinguished by specialized primary spines.
Porocidaris purpurata is an older name for Histocidaris purpurata, a cidaroid sea urchin described by Thomson in 1872.
Cidaris rugosa is a cidaroid sea urchin described by H.L. Clark in 1907, studied for complex calcite microstructures in its skeleton.
Ctenocidaris perrieri is an Antarctic cidaroid sea urchin described by René Koehler in 1912 and distinguished within its genus by toothed primary spines.
