Classification of the class Enteropneusta

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Fm. Harrimaniidae Spengel 1901
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G. Saccoglossus Schimkewitsch 1892
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†Saccoglossus testa Cameron 2016
G. †Spartobranchus Caron et al. 2013
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†Spartobranchus tenuis Caron et al. 2013
Fm. Spengelidae Willey 1899
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G. †Mazoglossus Bardack 1997
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†Mazoglossus ramsdelli Bardack 1997