Theelia
''Theelia'' is an extinct genus of sea cucumbers that existed from 312 to 40.4 million years ago (Middle Pennsylvanian to the Lutetian age). Fossil sclerites of ''Theelia'' are found worldwide. Taxonomy Numerous species are assigned to the genus ''Theelia'', they include the following: * †''Theelia alta'' Speckmann 1968 * †''Theelia alveata'' Mostler and Rahimi-Yazd 1976 * †''Theelia anguinea'' Mostler 1971 * †''Theelia conglobata'' Mostler 1971 * †'' Theelia convexa'' Whidborne 1883 * †'' Theelia crassidentata'' Deflandre-Rigaud 1950 * †'' Theelia dentata'' Górka and Luszczewska 1969 * †''Theelia doreckae'' Kozur and Mostler 1971 * †''Theelia dzhulfaensis'' Mostler and Rahimi-Yazd 1976 * †''Theelia fastigata'' Mostler 1972 * †'' Theelia fissa'' Mostler 1971 * †''Theelia florida'' Frizzell and Exline 1955 * †''Theelia guembeli'' Kristan-Tollmann 1963 * †'' Theelia heptalampra'' (Bartenstein, 1936) * †'' Theelia hexacneme'' Summerson and Campbell 1 ...
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