Between brackets is the number of accepted species
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- Biota
- Kingdom Animalia
- Phylum Acanthocephala
- Phylum Agmata †
- Phylum Animalia (awaiting allocation)
- Phylum Animalia incertae sedis
- Phylum Annelida
- Phylum Arthropoda
- Phylum Brachiopoda
- Phylum Bryozoa
- Phylum Cephalorhyncha incertae sedis
- Phylum Chaetognatha
- Phylum Chitinozoa †
- Phylum Chordata
- Phylum Cnidaria
- Phylum Ctenophora
- Phylum Cycliophora
- Phylum Cycloneuralia incertae sedis
- Phylum Ecdysozoa incertae sedis †
- Phylum Echinodermata
- Class Asteroidea
- Class Asterozoa (awaiting allocation)
- Class Blastoidea †
- Class Cornuta
- Class Coronata
- Class Coronoidea †
- Class Crinoidea
- Class Ctenocystoidea †
- Class Cystoidea
- Class Diploporita †
- Class Echinodermata (awaiting allocation)
- Class Echinodermata incertae sedis
- Class Echinoidea
- Class Edrioasteroidea †
- Class Edrioblastoidea †
- Class Eocrinoidea †
- Class Helicoplacoidea †
- Class Holothuroidea
- Order Apoda accepted as Apodida
- Order Apodida
- Order Arthrochirotida †
- Order Aspidochirotida
- Order Dactylochirotida
- Order Dendrochirotida
- Family Calclamnidae
- Family Cucumariidae Ludwig, 1894
- Genus Abyssocucumis Heding, 1942
- Genus Acolochirus Clark, 1946 accepted as Plesiocolochirus Cherbonnier, 1946
- Genus Actinia Pallas, 1766 accepted as Pentacta Goldfuss, 1820
- Genus Actinocucumis Ludwig, 1875
- Genus Amphicyclus Bell, 1884
- Genus Anaperus Troschel, 1846
- Genus Apentacta Clark, 1946 accepted as Plesiocolochirus Cherbonnier, 1946
- Genus Apseudocnus Levin, 2006
- Genus Apsolidium O'Loughlin & O'Hara, 1992
- Genus Aslia Rowe, 1970
- Genus Athyonidium Deichmann, 1941
- Genus Australocnus O'Loughlin & Alcock, 2000
- Genus Benthophyllophorus Deichmann, 1954
- Genus Botryodactyla Ayres, 1851 accepted as Cucumaria de Blainville, 1830
- Genus Calcamariina O'Loughlin in O'Loughlin et al., 2015
- Genus Cercodemas Selenka, 1867
- Genus Cherbocnus Thandar in Thandar & Mjobo, 2014
- Genus Cladodactyla Brandt, 1835
- Genus Colochirus Troschel, 1846
- Genus Cucamba O'Loughlin, 2009
- Genus Cucumania Koehler, 1927 accepted as Cucumaria de Blainville, 1830
- Genus Cucumaria de Blainville, 1830
- Species Cucumaria abyssorum Auctt. accepted as Abyssocucumis abyssorum (Théel, 1886)
- Species Cucumaria abyssorum Théel, 1886 accepted as Abyssocucumis abyssorum (Théel, 1886)
- Species Cucumaria acicula Semper, 1867
- Species Cucumaria acuta Massin, 1992
- Species Cucumaria adela H.L. Clark, 1946
- Species Cucumaria africana Semper, 1867
- Species Cucumaria albatrossi Cherbonnier, 1941 accepted as Staurocucumis abyssorum (Théel, 1886)
- Species Cucumaria albida Selenka accepted as Cucumaria miniata (Brandt, 1835)
- Species Cucumaria alcocki Koehler & Vaney, 1908 accepted as Pseudocnus alcocki (Koehler & Vaney, 1908)
- Species Cucumaria amokurae Mortensen, 1925 accepted as Psolidocnus amokurae (Mortensen, 1925)
- Species Cucumaria analis Vaney, 1908 accepted as Cucumaria georgiana (Lampert, 1886)
- Species Cucumaria anivaensis Levin, 2004
- Species Cucumaria antarctica Vaney, 1906 accepted as Heterocucumis steineni (Ludwig, 1898)
- Species Cucumaria arcuata (Hérouard, 1921)
- Species Cucumaria ardens Koehler & Vaney, 1908 accepted as Havelockia ardens (Koehler & Vaney, 1908)
- Species Cucumaria areolata Ekman, 1918
- Species Cucumaria argillacea Sluiter, 1910 accepted as Neothyone belli Ludwig, 1887
- Species Cucumaria ariana Koehler & Vaney, 1908 accepted as Havelockia ariana (Koehler & Vaney, 1908)
- Species Cucumaria armata Vaney, 1908 accepted as Cucamba psolidiformis (Vaney, 1908)
- Species Cucumaria aspera Vaney, 1908 accepted as Psolicrux coatsi (Vaney, 1908) O'Loughlin, 2002
- Species Cucumaria assimilis Düben & Koren, 1846 accepted as Cucumaria frondosa (Gunnerus, 1767)
- Species Cucumaria assimilis Bell, 1886 accepted as Afrocucumis africana (Semper, 1867)
- Species Cucumaria attenuata Vaney, 1906 accepted as Cucumaria georgiana (Lampert, 1886)
- Species Cucumaria bacilliformis Koehler & Vaney, 1908 accepted as Leptopentacta bacilliformis (Koehler & Vaney, 1908)
- Species Cucumaria bicolor Bell, 1887
- Species Cucumaria bollonsi Mortensen, 1925
- Species Cucumaria bouvetensis Ludwig & Heding, 1935 accepted as Trachythyone bouvetensis (Ludwig & Heding, 1935)
- Species Cucumaria brevidentis
- Species Cucumaria brunnea (Forbes) accepted as Ocnus brunneus Forbes & Goodsir in Forbes, 1841
- Species Cucumaria calcigera (Stimpson, 1851)
- Species Cucumaria californica Semper, 1868
- Species Cucumaria canescens Semper, 1867
- Species Cucumaria capensis Théel, 1886 accepted as Ocnus capensis (Théel, 1886)
- Species Cucumaria cataphracta Sluiter, 1901 accepted as Ocnus cataphractus (Sluiter, 1901)
- Species Cucumaria chierchiae Ludwig, 1887 accepted as Pentamera chierchiae (Ludwig, 1887)
- Species Cucumaria chilensis Ludwig, 1875
- Species Cucumaria chiloensis Ludwig, 1887 accepted as Pentamera chiloensis (Ludwig, 1887)
- Species Cucumaria chronhjelmi Théel, 1886
- Species Cucumaria chuni Ludwig & Heding, 1935 accepted as Temparena chuni (Ludwig & Heding, 1935)
- Species Cucumaria citrea Semper, 1867 accepted as Pentamera citrea (Semper, 1867)
- Species Cucumaria coatsi Vaney, 1908
- Species Cucumaria cognata Lampert, 1885 accepted as Thyone cognata (Lampert, 1885)
- Species Cucumaria communis Forbes & Goodsir in Forbes, 1841 accepted as Thyonidium drummondii (Thompson, 1840)
- Species Cucumaria compressa (R. Perrier, 1898)
- Species Cucumaria conciliatrix Sluiter, 1901 accepted as Havelockia conciliatrix (Sluiter, 1901)
- Species Cucumaria congoana Ludwig & Heding, 1935
- Species Cucumaria conicospermium Levin & Stepanov, 2002
- Species Cucumaria conjugens Semper, 1868
- Species Cucumaria conjungens Semper, 1867 accepted as Stolus conjungens (Semper, 1867)
- Species Cucumaria conspicua Vaney, 1908 accepted as Cucamba psolidiformis (Vaney, 1908)
- Species Cucumaria constricta Ohshima, 1915 accepted as Pentamera constricta (Ohshima, 1915)
- Species Cucumaria convergens Hérouard, 1901 accepted as Psolidium convergens (Hérouard, 1901)
- Species Cucumaria corbula Cherbonnier, 1953 accepted as Ocnus corbulus (Cherbonnier, 1953)
- Species Cucumaria cornuta Cherbonnier, 1941 accepted as Pseudocnus cornutus (Cherbonnier, 1941)
- Species Cucumaria cosmotyrsitus Wells, 1924 accepted as Pentamera trachyplaca (H.L. Clark, 1924)
- Species Cucumaria crax Deichmann, 1941
- Species Cucumaria crocea Lesson, 1830
- Species Cucumaria croceoida Vaney, 1908 accepted as Cladodactyla crocea (Lesson, 1830) Panning, 1949
- Species Cucumaria crucifera Semper, 1869 accepted as Trachythyone crucifera (Semper, 1869)
- Species Cucumaria crucigera
- Species Cucumaria cucumis (Risso, 18??) accepted as Leptopentacta elongata (Düben & Koren, 1846)
- Species Cucumaria curata Cowles, 1907
- Species Cucumaria cylindrica Semper, 1867 accepted as Ocnus cylindricus Semper, 1867
- Species Cucumaria deichmanni Cherbonnier, 1952 accepted as Roweia frauenfeldi (Ludwig, 1882)
- Species Cucumaria denticulata Ekman, 1927 accepted as Heterocucumis denticulata (Ekman, 1927)
- Species Cucumaria dicquemarii M. Sars, 1857 accepted as Ocnus grubei (von Marenzeller, 1874)
- Species Cucumaria digitata Koehler & Vaney, 1910 accepted as Vaneyella digitata (Koehler & Vaney, 1910)
- Species Cucumaria diligens D'yakonov & Baranova in D'yakonov et al., 1958
- Species Cucumaria discolor Théel, 1886
- Species Cucumaria dubiosa Semper, 1868 accepted as Pseudocnus dubiosus (Semper)
- Species Cucumaria dudexa O'Loughlin & Manjón-Cabeza, 2009
- Species Cucumaria duriuscula Sluiter, 1901
- Species Cucumaria dyakonovi Baranova, 1980
- Species Cucumaria echinata Marenzeller von, 1881
- Species Cucumaria ekmani Ludwig & Heding, 1935 accepted as Neopsolidium kerguelensis (Théel, 1886)
- Species Cucumaria elongara
- Species Cucumaria elongata Düben & Koren, 1846
- Species Cucumaria exigua Ludwig, 1875 accepted as Eupentacta exigua (Ludwig, 1875)
- Species Cucumaria falcata Sluiter, 1901 accepted as Havelockia falcata (Sluiter, 1901)
- Species Cucumaria fallax Ludwig, 1875
- Species Cucumaria farquhari Mortensen, 1925 accepted as Psolidocnus farquhari Mortensen, 1925
- Species Cucumaria fastigata Sluiter, 1901 accepted as Havelockia fastigata (Sluiter, 1901)
- Species Cucumaria ferrari (Bell)
- Species Cucumaria filholi Perrier R, 1903 accepted as Heterothyone alba (Hutton, 1872)
- Species Cucumaria fisheri Wells, 1924
- Species Cucumaria flamma Solis-Marin & Laguarda-Figueras, 1999
- Species Cucumaria forbesi Bell, 1886 accepted as Aslia forbesi (Bell, 1886)
- Species Cucumaria fraudatrix D'yakonov & Baranova in D'yakonov et al., 1958 accepted as Eupentacta fraudatrix (D'yakonov & Baranova in D'yakonov et al., 1958)
- Species Cucumaria frauenfeldi Ludwig, 1882 accepted as Roweia frauenfeldi (Ludwig, 1882)
- Species Cucumaria frondosa (Gunnerus, 1767)
- Species Cucumaria fusiformis Levin, 2006
- Species Cucumaria georgiana (Lampert, 1886)
- Species Cucumaria glaberrima Semper, 1869 accepted as Trachythyone glaberrima (Semper, 1869)
- Species Cucumaria glacialis Ljungman, 1879
- Species Cucumaria globosa Ohshima, 1915 accepted as Echinocucumis globosa (Ohshima, 1915)
- Species Cucumaria godeffroyi Semper, 1867 accepted as Heterocucumis godeffroyi (Semper, 1867)
- Species Cucumaria godfroyi Vaney, 1914 accepted as Heterocucumis steineni (Ludwig, 1898)
- Species Cucumaria grandis Vaney, 1906
- Species Cucumaria gravieri Vaney, 1905 accepted as Plesiocolochirus dispar (Lampert, 1889)
- Species Cucumaria grubei Marenzeller von, 1874 accepted as Ocnus grubei (von Marenzeller, 1874)
- Species Cucumaria hartmeyeri Helfer, 1912 accepted as Ocnus hartmeyeri (Helfer, 1912)
- Species Cucumaria hispida (Barrett, 1857) accepted as Echinocucumis hispida (Barrett, 1857)
- Species Cucumaria huttoni Dendy, 1897 accepted as Placothuria huttoni (Dendy, 1896)
- Species Cucumaria hyalina Forbes, 1841 accepted as Thyonidium hyalinum (Forbes, 1841)
- Species Cucumaria hyndmanni Wyville Thompson, 1840 accepted as Panningia hyndmanni (W. Thompson, 1840)
- Species Cucumaria ignava Ludwig, 1875
- Species Cucumaria ijimai Ohshima, 1915
- Species Cucumaria imbellis Koehler & Vaney, 1910 accepted as Havelockia imbellis (Koehler & Vaney, 1910)
- Species Cucumaria improvisa Ludwig, 1875 accepted as Trachythyone improvisa (Ludwig, 1875)
- Species Cucumaria inconspicua Bell, 1887
- Species Cucumaria incurvata Perrier R, 1898 accepted as Leptopentacta tergestina (M. Sars, 1857)
- Species Cucumaria inflexa Koehler & Vaney, 1908 accepted as Mitsukuriella inflexa (Koehler & Vaney, 1908)
- Species Cucumaria ingolfi Deichmann in Mortensen, 1927
- Species Cucumaria insolens Théel, 1886 accepted as Pseudocnella insolens (Théel, 1886)
- Species Cucumaria insperata D'yakonov & Baranova in D'yakonov et al., 1958
- Species Cucumaria investigatoris Koehler & Vaney, 1908 accepted as Thorsonia investigatoris (Koehler & Vaney, 1908)
- Species Cucumaria irregularis Vaney, 1906
- Species Cucumaria jaegeri Krauss in Lampert, 1885 accepted as Pseudocnella sykion (Lampert, 1885)
- Species Cucumaria japonica Semper, 1868
- Species Cucumaria joubibi Vaney, 1914
- Species Cucumaria joubini Vaney, 1914 accepted as Cucumaria georgiana (Lampert, 1886)
- Species Cucumaria kerguelensis Théel, 1886
- Species Cucumaria kirchbergii accepted as Cucumaria kirchsbergii Heller, 1868
- Species Cucumaria kirchsbergii Heller, 1868 accepted as Stereoderma kirchsbergii (Heller, 1868) Panning, 1949
- Species Cucumaria kirschbergi Heller, 1868 accepted as Panningia kirschbergi (Heller, 1868)
- Species Cucumaria köllikeri Semper, 1868 accepted as Ocnus koellikeri (Semper, 1868)
- Species Cucumaria koraeensis Östergren, 1898 accepted as Cucumaria koreaensis Östergren, 1898
- Species Cucumaria koreaensis Östergren, 1898
- Species Cucumaria korenii Lütken, 1857 accepted as Pentamera calcigera Stimpson, 1851
- Species Cucumaria lactea (Forbes, 1839)
- Species Cucumaria lamberti Levin & Gudimova, 1998
- Species Cucumaria lamperti Ohshima, 1915
- Species Cucumaria lateralis Vaney, 1906 accepted as Cucumaria georgiana (Lampert, 1886)
- Species Cucumaria lefevrii Barrois, 1882 accepted as Aslia lefevrii (Barrois, 1882)
- Species Cucumaria leonina Semper, 1867 accepted as Pseudocnus dubiosus (Semper)
- Species Cucumaria leoninoides Mortensen, 1925 accepted as Pseudocnus leoninoides (Mortensen, 1925)
- Species Cucumaria levini Stepanov & Pil'ganchuk, 2002
- Species Cucumaria liouvillei Vaney, 1914 accepted as Staurocucumis liouvillei (Vaney, 1914) Ekman, 1927
- Species Cucumaria lissoplaca H.L. Clark, 1924 accepted as Pentamera lissoplaca (H.L. Clark, 1924)
- Species Cucumaria longicauda Östergren, 1898 accepted as Allothyone longicauda (Östergren, 1898)
- Species Cucumaria longipeda Semper, 1867 accepted as Phyllophorus longipeda (Semper, 1867)
- Species Cucumaria lubrica H.L. Clark, 1901
- Species Cucumaria maculata Semper, 1867
- Species Cucumaria manoelina Tommasi, 1971
- Species Cucumaria marionii Marenzeller von, 1877 accepted as Neocucumis marionii (Marenzeller von, 1877)
- Species Cucumaria mauritanica Hérouard, 1929 accepted as Paracucumaria mauritanica (Hérouard, 1929)
- Species Cucumaria mendax Théel, 1886 accepted as Pseudocnus dubiosus (Semper)
- Species Cucumaria miniata (Brandt, 1835)
- Species Cucumaria mira Ludwig & Heding, 1935
- Species Cucumaria mirabilis Théel, 1886
- Species Cucumaria montagui (Fleming, 1828)
- Species Cucumaria mosaïca Koehler & Vaney, 1910 accepted as Pseudothyone mosaica (Koehler & Vaney, 1910)
- Species Cucumaria mosterensis Grieg, 1889 accepted as Ocnus lacteus (Forbes & Goodsir, 1839)
- Species Cucumaria mucronata Sluiter, 1901 accepted as Allothyone mucronata (Sluiter, 1901)
- Species Cucumaria multipes Théel, 1886 accepted as Sclerodactyla multipes (Théel, 1886)
- Species Cucumaria munita Sluiter, 1901
- Species Cucumaria mutans Joshua, 1914
- Species Cucumaria nigricans (Brandt, 1835)
- Species Cucumaria nina Deichmann, 1930 accepted as Trachythyone nina (Deichmann, 1930)
- Species Cucumaria nobilis Ludwig, 1875 accepted as Thyonidium drummondii (Thompson, 1840)
- Species Cucumaria nocturna Sluiter, 1901 accepted as Staurocucumis nocturna (Sluiter, 1901)
- Species Cucumaria normani Pace, 1904
- Species Cucumaria nozawai Mitsukuri, 1912 accepted as Havelockia nozawai (Mitsukuri, 1912)
- Species Cucumaria obscura Levin, 2006
- Species Cucumaria obunca Lampert, 1885 accepted as Havelockia obunca (Lampert, 1885)
- Species Cucumaria okhotensis Levin & Stepanov, 2003
- Species Cucumaria pallida Kirkendale & Lambert, 1995
- Species Cucumaria paraglacialis Heding, 1942
- Species Cucumaria parassimilis Deichmann, 1930
- Species Cucumaria parva Ludwig, 1875 accepted as Trachythyone parva (Ludwig, 1875)
- Species Cucumaria pentactes Forbes, 1841 accepted as Leptopentacta elongata (Düben & Koren, 1846)
- Species Cucumaria perdita Koehler & Vaney, 1910 accepted as Havelockia perdita (Koehler & Vaney, 1910)
- Species Cucumaria perfida Vaney, 1908
- Species Cucumaria periprocta Vaney, 1908
- Species Cucumaria perrieri Ekman, 1927 accepted as Pseudocnus perrieri (Ekman, 1927) Panning, 1963
- Species Cucumaria perspicua Ludwig, 1875 accepted as Thyonidium drummondii (Thompson, 1840)
- Species Cucumaria pigra Koehler & Vaney, 1908
- Species Cucumaria piperata (Stimpson, 1864)
- Species Cucumaria pithacnion Lampert, 1886 accepted as Cucumaria georgiana (Lampert, 1886)
- Species Cucumaria planci Von Marenzeller, 1893
- Species Cucumaria planciana (Delle Chiaje, 1841)
- Species Cucumaria populifera (Stimpson, 1864) accepted as Pentamera populifera (Stimpson, 1864)
- Species Cucumaria posthuma Lampert, 1885 accepted as Roweia frauenfeldi (Ludwig, 1882)
- Species Cucumaria pseudocurata Deichmann, 1938
- Species Cucumaria psolidiformis Vaney, 1908
- Species Cucumaria pulcherrima (Ayres, 1854)
- Species Cucumaria punctata Ludwig, 1875 accepted as Aslia punctata (Ludwig, 1875)
- Species Cucumaria pusilla Ludwig, 1886
- Species Cucumaria quinquesemita Selenka, 1867 accepted as Eupentacta quinquesemita (Selenka, 1867)
- Species Cucumaria rapax Koehler & Vaney, 1908 accepted as Stolus rapax (Koehler & Vaney, 1908)
- Species Cucumaria redimita Sluiter, 1901 accepted as Havelockia redimita (Sluiter, 1901)
- Species Cucumaria reducta Sluiter, 1901 accepted as Phyllophorus brocki Ludwig, 1888
- Species Cucumaria rhopalodiformis Heding, 1943 accepted as Pseudocnus rhopalodiformis (Heding, 1943)
- Species Cucumaria rigidapeda Cherbonnier, 1952 accepted as Trachythyone rigidapeda (Cherbonnier, 1952)
- Species Cucumaria sachalinica D'yakonov, 1949
- Species Cucumaria salma Yingst, 1972
- Species Cucumaria salmini Ludwig, 1875 accepted as Pseudocnus dubiosus (Semper)
- Species Cucumaria sancti-johannis Bell, 1887 accepted as Aslia sanctijohannis (Bell, 1887)
- Species Cucumaria savelijevae Baranova, 1980
- Species Cucumaria saxicola Brady & Robertson, 1871 accepted as Pawsonia saxicola (Brady & Robertson, 1871)
- Species Cucumaria secunda Vaney, 1908
- Species Cucumaria semperi Bell, 1884 accepted as Hemithyone semperi (Bell, 1884)
- Species Cucumaria serrata Théel, 1886
- Species Cucumaria sinorbis Cherbonnier, 1952 accepted as Pseudocnella sinorbis (Cherbonnier, 1952)
- Species Cucumaria sluiteri Ohshima, 1915 accepted as Abyssocucumis abyssorum (Théel, 1886)
- Species Cucumaria sordidata Sluiter, 1901 accepted as Neocucumis sordidatus (Sluiter, 1901)
- Species Cucumaria souriei Cherbonnier, 1949 accepted as Staurocucumis souriei (Cherbonnier, 1949)
- Species Cucumaria spatha Cherbonnier, 1941 accepted as Staurocucumis turqueti (Vaney, 1906)
- Species Cucumaria spinosa Ohshima, 1915 accepted as Pseudocnus spinosus (Ohshima, 1915)
- Species Cucumaria splendidus (Gutt, 1990)
- Species Cucumaria spyridophora Clark, 1923 accepted as Aslia spyridophora (H.L. Clark, 1923)
- Species Cucumaria squamata Ludwig, 1898 accepted as Trachythyone muricata Studer, 1876
- Species Cucumaria squamatoides Clark, 1946 accepted as Apsolidium alvei O'Loughlin & O'Hara, 1992
- Species Cucumaria squamulosa Mitsukuri, 1912 accepted as Mitsukuriella squamulosa (Mitsukuri, 1912)
- Species Cucumaria steineni Ludwig, 1898 accepted as Heterocucumis steineni (Ludwig, 1898)
- Species Cucumaria stephensoni John, 1939 accepted as Roweia stephensoni (John, 1939)
- Species Cucumaria striata Joshua & Creed, 1915
- Species Cucumaria sykion (Lampert, 1885) accepted as Pseudocnella sykion (Lampert, 1885)
- Species Cucumaria syracusana Auctt. accepted as Ocnus syracusanus (Grube, 1840) Panning, 1949
- Species Cucumaria syracusiana (Grube) accepted as Pseudocnella syracusana (Grube, 1840)
- Species Cucumaria tabulifera Perrier R, 1904 accepted as Pentamera chiloensis (Ludwig, 1887)
- Species Cucumaria tegulata Augustin, 1908 accepted as Pseudocnella sykion (Lampert, 1885)
- Species Cucumaria tenuicoriata Wells, 1924 accepted as Pentamera populifera (Stimpson, 1864)
- Species Cucumaria tenuis Ludwig, 1875
- Species Cucumaria tergestina M. Sars, 1857 accepted as Leptopentacta tergestina (M. Sars, 1857)
- Species Cucumaria tetracentriophora Heding, 1938 accepted as Pseudoaslia tetracentriophora (Heding, 1938)
- Species Cucumaria thomsoni Hutton, 1879 accepted as Amphicyclus thomsoni (Hutton, 1878)
- Species Cucumaria trachyplaca H.L. Clark, 1924 accepted as Pentamera trachyplaca (H.L. Clark, 1924)
- Species Cucumaria transitoria Vaney, 1905
- Species Cucumaria tricolor Sluiter, 1901
- Species Cucumaria turbinata (Hutton, 1879) accepted as Ohshimella ehrenbergii (Selenka, 1868)
- Species Cucumaria turqueti Vaney, 1906 accepted as Staurocucumis turqueti (Vaney, 1906)
- Species Cucumaria vaneyi Cherbonnier, 1949
- Species Cucumaria vegae Théel, 1886
- Species Cucumaria velligera Ludwig & Heding, 1935 accepted as Sclerothyone velligera (Ludwig & Heding, 1935)
- Species Cucumaria versicolor Semper, 1867
- Species Cucumaria vicaria Sluiter, 1910
- Species Cucumaria vilis Sluiter, 1901
- Species Cucumaria villosa Grube, 1871 accepted as Thyone fusus (O.F. Müller, 1776)
- Species Cucumaria webbi Thandar, 1977
- Genus Cucumella Heding in Ludwig & Heding, 1935
- Genus Cucuvitrum O'Loughlin & O'Hara, 1992
- Genus Dendrelasia O'Loughlin in O'Loughlin, Stępień, Kuźniak & Van Den Spiegel, 2013 accepted as Cladodactyla Brandt, 1835
- Genus Duasmodactyla Ayres, 1852 accepted as Thyonidium Düben & Koren, 1846
- Genus Echinopsolus Gutt, 1990
- Genus Ekmania Hansen & McKenzie, 1991
- Genus Ekmocucumis Heding, 1942 accepted as Staurocucumis Ekman, 1927
- Genus Eucyclus Lambert in Semper, 1885 accepted as Athyonidium Deichmann, 1941
- Genus Euthyonacta Deichmann, 1954
- Genus Euthyonidium Deichmann, 1938 accepted as Thyonidium Düben & Koren, 1846
- Genus Hemioedema Hérouard, 1929
- Genus Heterocucumis Panning, 1949
- Genus Icridion Gistl, 1848 accepted as Ocnus Forbes & Goodsir in Forbes, 1841
- Genus Incubocnus Thandar & Vinola, 2017
- Genus Koehleria Cherbonnier, 1988 accepted as Pseudocolochirus Pearson, 1910
- Genus Laevocnus O'Loughlin in O'Loughlin et al., 2014 accepted as Pentactella Verrill, 1876
- Genus Lanceophora Thandar, Zettler & Arumugam, 2010
- Genus Leptopentacta Clark, 1938
- Genus Loisettea Rowe & Pawson, 1985
- Genus Mensamaria Clark, 1946
- Genus Microchoerus Gutt, 1990 accepted as Echinopsolus Gutt, 1990
- Genus Neoamphicyclus Hickman, 1962
- Genus Neocnus Cherbonnier, 1972 accepted as Incubocnus Thandar & Vinola, 2017
- Genus Neocucumella Pawson, 1962
- Genus Neocucumis Deichmann, 1944
- Genus Ocnus Forbes & Goodsir in Forbes, 1841
- Genus Oligoclados Agassiz, 1846
- Genus Orbithyone Clark, 1938
- Genus Orcula Troschel, 1846 accepted as Ekmania Hansen & McKenzie, 1991
- Genus Paleopentacta Applegate, Buitrón-Sánchez, Solís-Marin & Laguarda-Figueras, 2009 †
- Genus Panningia Cherbonnier, 1958
- Genus Paracolochirus Pawson, Pawson & King, 2010
- Genus Paracucumaria Panning, 1949
- Genus Paracucumaria auct. accepted as Panningia Cherbonnier, 1958
- Genus Paraleptopentacta Mezali, Thandar & Khodja, 2020
- Genus Parathyonacta Caso, 1984
- Genus Parathyone Deichmann, 1957
- Genus Parathyonidium Heding in Heding & Panning, 1954
- Genus Parocnus Deichmann, 1941 accepted as Leptopentacta Clark, 1938
- Genus Patallus Selenka, 1868
- Genus Pattalus Selenka, 1868
- Genus Pawsonellus Thandar, 1986
- Genus Pawsonia Rowe, 1970
- Genus Pentacta Goldfuss, 1820
- Genus Pentactella Verrill, 1876
- Genus Pentacucumis Deichmann, 1957 accepted as Ocnus Forbes & Goodsir in Forbes, 1841
- Genus Pentocnus O'Loughlin & O'Hara, 1992
- Genus Plesiocolchirus Cherbonnier, 1946 accepted as Plesiocolochirus Cherbonnier, 1946
- Genus Plesiocolochirus Cherbonnier, 1946
- Genus Polyclados Brandt, 1835 accepted as Cladodactyla Brandt, 1835
- Genus Polycladus Agassiz, 1846
- Genus Pseudoaslia Thandar, 1991
- Genus Pseudocnella Thandar, 1987
- Genus Pseudocnus Panning, 1949
- Genus Pseudocolochirus Pearson, 1910
- Genus Pseudocolochirus Deichmann, 1930 accepted as Pseudocolochirus Pearson, 1910
- Genus Pseudopsolus Ludwig, 1898
- Genus Pseudrotasfer Bohn, 2007
- Genus Psolicrux O'Loughlin, 2002
- Genus Psolicucumis Heding, 1934
- Genus Psolidiella Mortensen, 1925
- Genus Psolidocnus O'Loughlin & Alcock, 2000
- Genus Psoliocucumis
- Genus Roweia Thandar, 1985
- Genus Satsumaocnus Yamana, Thandar & Setiamarga, 2022
- Genus Semperia Lampert in Semper, 1885 accepted as Cucumaria de Blainville, 1830
- Genus Siphothuria E. Perrier, 1886 accepted as Leptopentacta Clark, 1938
- Genus Squamocnus O'Loughlin & O'Hara, 1992
- Genus Staurocucumis Ekman, 1927
- Genus Staurothyone Clark, 1938
- Genus Stereoderma Ayres, 1851
- Genus Thyonacta Deichmann, 1941 accepted as Thyonella Verrill, 1872
- Genus Thyonella Verrill, 1872
- Genus Thyonidium Düben & Koren, 1846
- Genus Thyronidium Gray, 1848 accepted as Thyonidium Düben & Koren, 1846
- Genus Trachasina Thandar & Moodley, 2003
- Genus Trachycucumis Thandar & Moodley, 2003
- Genus Trachythyone Studer, 1876
- Genus Trachythyone auctt., non Studer, 1876 accepted as Leptopentacta Clark, 1938
- Genus Trochythyone Delage & Hérouard, 1903
- Genus Uroxia Costa, 1869 accepted as Thyone Oken, 1815
- Family Dendrochirotida (awaiting allocation)
- Family Dendrochirotida incertae sedis
- Family Exlinellidae
- Family Heterothyonidae Pawson, 1970
- Family Ludwigiidae accepted as Cucumariidae Ludwig, 1894
- Family Paracucumidae Pawson & Fell, 1965
- Family Phyllophoridae Östergren, 1907
- Family Placothuriidae Pawson & Fell, 1965
- Family Priscopedatidae Frizzell & Exline, 1956
- Family Psolidae Perrier, 1902
- Family Sclerodactylidae Panning, 1949
- Family Spinitidae
- Order Elasipodida
- Order Holothuriae (awaiting allocation)
- Order Holothuriida
- Order Holothuroidea (awaiting allocation)
- Order Holothuroidea incertae sedis
- Order Holothuroidea incertae sedis
- Order Molpadiida
- Order Persiculida
- Order Synallactida
- Genus Bromlichnus Vallon, Rindsberg, Röper, Rothgaenger & Rothgaenger, 2020 †
- Class Homoiostelea †
- Class Homostelea †
- Class Ophiocistioidea †
- Class Ophiuroidea
- Class Parablastoidea †
- Class Paracrinoidea †
- Class Rhombifera †
- Class Somasteroidea
- Class Stelleroidea
- Class Stylophora †
- Genus Anadema Meuschen, 1787
- Genus Artocrea Meuschen, 1787
- Genus Birita Meuschen, 1787
- Genus Disci-transfixus Meuschen, 1787
- Genus Galea Meuschen, 1787
- Genus Olivaeformis Meuschen, 1787
- Genus Stribilita Meuschen, 1787
- Phylum Entoprocta
- Phylum Gastrotricha
- Phylum Gnathostomulida
- Phylum Hemichordata
- Phylum Hyolitha †
- Phylum Kinorhyncha
- Phylum Lobopoda †
- Phylum Loricifera
- Phylum Micrognathozoa
- Phylum Mollusca
- Phylum Monoblastozoa accepted as Animalia incertae sedis
- Phylum Nematoda
- Phylum Nematomorpha
- Phylum Nemertea
- Phylum Onychophora
- Phylum Orthonectida
- Phylum Phoronida
- Phylum Placozoa
- Phylum Platyhelminthes
- Phylum Pogonophora accepted as Siboglinidae Caullery, 1914
- Phylum Porifera
- Phylum Priapula accepted as Priapulida
- Phylum Priapulida
- Phylum Problematica † accepted as Animalia incertae sedis
- Phylum Rhombozoa
- Phylum Rotifera
- Phylum Scalidophora incertae sedis
- Phylum Sipuncula
- Phylum Tardigrada
- Phylum Trace fossils †
- Phylum Vendobionta †
- Phylum Vestimentifera accepted as Siboglinidae Caullery, 1914
- Phylum Vetulicolia †
- Phylum Vinctiplicata incertae sedis †
- Phylum Xenacoelomorpha
- Genus Trilobocaris Pribyl, 1953 †
- Kingdom Archaea
- Kingdom Bacteria
- Kingdom Chromista
- Kingdom Fungi
- Kingdom Plantae
- Kingdom Protista accepted as Protozoa
- Kingdom Protozoa
- Kingdom Viruses
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