Classification of Toro and Herrera Sánchez 2019
Ph. Hemichordata Bateson 1885 [acorn worm]
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Cl. Pterobranchia Lankester 1877 [pterobranch]
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Subcl. Graptolithina Bronn 1849 [graptolite]
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Or. †Graptoloidea Lapworth 1875
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