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Hemichordata is a phylum o marine deuterostome animals, generally considered the sister group o the echinoderms.

Hemichordate
Temporal range: Miaolingian–Recent
Eichelwurm (cropped).jpg
Acorn wirm, a hemichordate.
Scientific classification e
Kinrick: Animalia
Superphylum: Deuterostomia
Phylum: Hemichordata
Bateson, 1885
Cless

Pterobranchia
Enteropneusta
Planctosphaera pelagica

And See text.