Classification of Gilliland 1992
Cl. Holothuroidea de Blainville 1834 [sea cucumber]
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Or. Apodida Brandt 1835
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Fm. †Achistridae Frizzell and Exline 1955
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G. †Achistrum Etheridge 1881
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†Achistrum monochordata Hodson et al. 1956
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Invalid names: Achistrum bartensteini Frizzell and Exline 1955 [synonym], Achistrum bichordata Fletcher 1962 [synonym]
†Achistrum nicholsoni Etheridge 1881
Invalid names: Achistrum (Achistrum) Hampton 1958 [invalid subgroup], Achistrum (Aduncrum) Hampton 1958 [invalid subgroup], Achistrum (Cancellrum) Hampton 1958 [invalid subgroup], Achistrum (Porachistrum) Beckmann 1965 [invalid subgroup], Achistrum (Spinrum) Hampton 1958 [invalid subgroup]
Fm. Synaptidae Burmeister 1837
G. Theelia Schlumberger 1890
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†Theelia crassidentata Deflandre-Rigaud 1950
†Theelia dentata Górka and Luszczewska 1969
†Theelia florida Frizzell and Exline 1955
†Theelia mortenseni Deflandre-Rigaud 1950
†Theelia stellifera Zankl 1966
†Theelia synapta Gilliland 1992
†Theelia undulata Schlumberger 1888
†Theelia variabilis Zankl 1966
†Theelia wartensis Garbowska and Wierzbowski 1967
Fm. Theeliidae Frizzell and Exline 1955
Or. Elasipoda Théel 1882
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G. †Praeeuphronides Mostler 1967
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†Praeeuphronides complexus Kozur and Mock 1972
†Praeeuphronides concavus Mostler 1971
†Praeeuphronides crassiramosus Mostler 1972
†Praeeuphronides latus Mostler 1972
†Praeeuphronides multiperforata Mostler 1968
†Praeeuphronides robustus Mostler 1970
†Praeeuphronides simplex Mostler 1969
G. †Staurocumites Deflandre-Rigaud 1952
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†Staurocumites bartensteini Deflandre-Rigaud 1952
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Invalid names: Priscopedatus acanthicus Mostler 1968 [synonym], Priscopedatus staurocumitoides Mostler 1968 [synonym], Staurocumites horridus Mostler 1968 [synonym]
Invalid names: Dendrochirotacea [empty], Punctatitidae Mostler and Rahimi-Yazd 1976 [empty]