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Heterocentrotus mamillatus is an extant sea-urchin belonging to the Echinoometridae family. This species, often called the slate pencil urchin, is notable for its distinctive, cylindrical spines resembling a pencil. Found throughout the Indo-Pacific region, it’s studied by marine biologists and rese...
Phyllacanthus imperialis is an Indo-Pacific pencil urchin described by Lamarck in 1816, recognized by thick blunt primary spines.
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Heterocentrotus trigonarius is a species of Indo-Pacific sea urchin belonging to the family Echinometridae, commonly known as the slate pencil urchin. It is recognized for its thick, distinctively triangular or wedge-shaped protective spines, which are noticeably broader and flatter than the needle-...
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.
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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.
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.
Phyllacanthus parvispinus is an eastern Australian and New Zealand pencil urchin described by Tenison-Woods in 1878.
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.
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.
Cidaris rugosa is a cidaroid sea urchin described by H.L. Clark in 1907, studied for complex calcite microstructures in its skeleton.
Rhynchocidaris triplopora is a ctenocidarid cidaroid sea urchin, notable as the sole recognized species of Rhynchocidaris, named in 1909.
Histocidaris nuttingi is a species of Histocidaridae, a spiny cidaroid sea urchin first described by Danish echinoderm specialist Mortensen in 1926.
Notocidaris gaussensis is an Antarctic ctenocidarid sea urchin described by Mortensen in 1909, in a genus centered on Antarctic and southern waters.
Notocidaris mortenseni is a southern ctenocidarid sea urchin described by Koehler in 1900, later placed in Mortensen's Antarctic genus Notocidaris.
Tretocidaris bartletti is a Caribbean cidarid sea urchin described by Alexander Agassiz in 1880 and placed in Mortensen's genus Tretocidaris.
