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| Hemichordata (Kiemenlochtiere) Hemichordata |
The gill hole animals (Hemichordata) are an animal phylum to which only a good 100 known extant species belong. They include two groups, which are performed in the classical systematics in the rank of classes - the worm-like acorn worms (Enteropneusta) and the colony-forming, fixed (sessile) winged gills (Pterobranchia). |
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Hemichordata (Kiemenlochtiere) Hemichordata |
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