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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 a species of sea urchin belonging to the family Cidaridae, commonly known as the imperial pencil urchin. First described by Jean-Baptiste Lamarck in 1816, this echinoid is native to the shallow waters of the Indo-Pacific region. It is characterized by its distinctive, thi...
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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, described by German zoologist Ludwig Döderlein in 1887, is a species of pencil urchin endemic to the Galápagos Islands. This sea urchin is characterized by its thick, blunt spines that resemble pencils and its distinctive globular test (shell), which typically measures 3-5 ce...
Eucidaris thouarsii is a species of slate-pencil sea urchin belonging to the family Cidaridae, described by Louis Agassiz and L. R. Desor in 1846. It inhabits the eastern Pacific Ocean, with a geographic range extending from the Gulf of California down to Panama. This reef-dwelling echinoid is chara...
Cidaris cidaris is a species of sea urchin belonging to the family Cidaridae, commonly referred to as pencil urchins. First described by Carl Linnaeus in 1758, this echinoid is characterized by its thick, smooth, and blunt primary spines that resemble stubby pencils. It inhabits deep-water marine en...
Eucidaris metularia is a cidaroid sea urchin in the family Cidaridae, first described by French naturalist Jean-Baptiste Lamarck in 1816. It inhabits shallow reef environments of the Indo-Pacific region. The species bears characteristic sparse, heavy spines that are flattened and banded, typical of...
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Prionocidaris baculosa is a species of cidaroid sea urchin found in the marine waters of the Indo-West Pacific region. Originally described by the French naturalist Jean-Baptiste Lamarck in 1816, this echinoid is biologically characterized by its thick, robust spines. Because the spines lack a livin...
Tylocidaris clavigera is an extinct species of cidaroid sea urchin that existed during the Cretaceous period. As a member of the pencil urchin group, it possessed a rigid test and thick, club-like spines used for protection and locomotion along the seafloor. Fossils of this species are primarily fou...
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.
