Classification of Clark and Twitchell 1915

Ph. Echinodermata Klein 1754
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Cl. Echinoidea Leske 1778 [sea urchin]
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Subcl. Irregularia Latreille 1825
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Unr. Atelostomata von Zittel 1879
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Invalid names: Asternata [empty], Sternata [empty]
Invalid names: Gnathostomata von Zittel 1879 [empty]
Subcl. Regularia Latreille 1825
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Or. Cidaroidea Claus 1880
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Fm. Cidaridae Gray 1825
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G. Cidaris Leske 1778
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†Cidaris alabamensis Morton 1846
†Cidaris alabamensis Morton 1846
†Cidaris blandis De Gregorio 1890
†Cidaris branneri Arnold 1908
†Cidaris carolinensis Emmonds 1858
†Cidaris dilleri Clark and Twitchell 1915
†Cidaris dixiensis Cragin 1893
†Cidaris georgiana Clark and Twitchell 1915
†Cidaris merriami Arnold 1908
†Cidaris mitchelli Emmonds 1858
†Cidaris modestus De Gregorio 1890
†Cidaris mortoni Conrad 1850
†Cidaris nahalakensis de Loriol 1887
†Cidaris ordinatus De Gregorio 1890
†Cidaris perdubius De Gregorio 1890
†Cidaris plumasensis Clark and Twitchell 1915
†Cidaris pratti Clark and Twitchell 1915
†Cidaris shastensis Clark and Twitchell 1915
†Cidaris smithi Clark and Twitchell 1915
†Cidaris splendens Morton 1841
†Cidaris taylorensis Clark 1893
†Cidaris tehamaensis Clark and Twitchell 1915
†Cidaris texanus Clark 1891
†Cidaris thouarsii Valencienncs 1846
†Cidaris walcotti Clark 1891
G. †Leiocidaris Desor 1855
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†Leiocidaris hemigranosus Shumard 1860
Invalid names: Diademoidea [empty]
Cl. Holothuroidea de Blainville 1834 [sea cucumber]
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Invalid names: Paractinopoda [empty]
Cl. Stelleroidea Gregory 1900
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Subcl. Ophiuroidea Gray 1840 [brittle star]
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Invalid names: Zygophiurae [empty]
Cl. Crinoidea Miller 1821 [Sea lily]
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Subcl. †Dicyclica
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Or. †Flexibilia Zittel 1895
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Invalid names: Pinnata [empty]
Or. †Inadunata Wachsmuth and Springer 1897
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Subor. †Dendrocrinoidea Bather 1899
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Fm. †Encrinidae Dujardin and Hupé 1862
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G. †Encrinus Lamarck 1801
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†Encrinus hyatti Clark and Twitchell 1915
Fm. †Marsupitidae d'Orbigny 1852
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G. †Marsupites Mantell 1821
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†Marsupites americanus Springer 1911
Fm. †Pentacrinidae Gray 1842
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G. †Isocrinus von Meyer 1836
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†Isocrinus californicus Clark and Twitchell 1915
†Isocrinus knighti Springer 1909
†Isocrinus smithi Clark and Twitchell 1915
Fm. †Uintacrinidae Zittel 1879
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G. †Uintacrinus Grinnell 1876
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†Uintacrinus socialis Grinnell 1876
G. Brissus Gray 1825
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†Brissus spatiosus Ravenel 1848
G. †Epiaster
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†Epiaster whitei Clark 1891
Subcl. †Asteridae
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G. Asterias Linnaeus 1758
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†Asterias dubium Whitfield 1877
†Asterias lincki Sears 1905
†Asterias remondii Gabb 1866
†Asterias stellionura Sears 1905
G. †Pentacrinus Miller 1821
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†Pentacrinus asteriscus Meek and Hayden 1858
†Pentacrinus bryani Gabb 1876
†Pentacrinus shastensis Clark and Twitchell 1915
†Pentacrinus tehamaensis Clark and Twitchell 1915
†Pentacrinus whitei Clark 1893
Fm. Scutellidae Gray 1825
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G. †Astrodapsis Conrad 1856
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†Astrodapsis antiselli Conrad 1856
†Astrodapsis arnoldi Clark and Twitchell 1915
†Astrodapsis tumidus Rémond 1863
†Astrodapsis whitneyi Rémond 1863
G. Echinarachnius Gray 1825
G. Encope Agassiz 1840
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†Encope macrophora Ravenel 1842
G. Mellita Agassiz 1841
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†Mellita caroliniana Ravenel 1841
†Mellita pentapora Gmelin 1788
G. †Mortonella Pomel 1883
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G. †Periarchus Conrad 1866
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†Periarchus altus Conrad 1865
†Periarchus lyelli Conrad 1834
†Periarchus pileussinensis Ravenel 1844
†Periarchus protuberans Clark and Twitchell 1915
G. Scutaster Pack 1909
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†Scutaster andersoni Pack 1909
G. †Scutella Lamarck 1816
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†Scutella aberti Conrad 1842
†Scutella andersoni Clark and Twitchell 1915
†Scutella conradi Cotteau 1891
†Scutella fairbanksi Arnold 1907
†Scutella gabbi Rémond 1863
†Scutella merriami Anderson 1905
†Scutella mississippiensis Clark and Twitchell 1915
†Scutella norrisi Pack 1909
†Scutella tuomeyi Clark and Twitchell 1915
Subcl. Asteroidea de Blainville 1830 [sea star]
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Or. Cryptozonia Sladen 1889
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Fm. Asteriidae Gray 1840
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Fm. Astropectinidae Gray 1840
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G. Astropecten Gray 1840
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†Astropecten montanus Douglass 1903
Invalid names: Atheneidae [empty], Pentacerotidae [empty], Pentagonasteridae [empty]
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G. Pentaceros Gray 1840
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†Pentaceros asperulus Weller 1907