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- Hemichordata - Hemichordata is a phylum of worm-shaped marine deuterostome animals, generally considered the sister group of the echinoderms. They date back to the Lower or Middle Cambrian and include an important class of fossils called graptolites, most of which became extinct in the Carboniferous.
- Pharyngeal slit - Pharyngeal slits, found in both hemichordata and chordata, are used by organisms in feeding. The wall of the pharynx is perforated by up to 200 vertical slits, which are separated by stiffening rods.
- Acorn worm - The Acorn worms or Enteropneusta are a hemichordate class of invertebrates. Acorn worms are classified in the phylum Hemichordata, closely related to the chordates.
- Pterobranchia - Pterobranchia is a clade of small, worm-shaped animals. They belong to the hemichordata, and live in secreted tubes on the ocean floor.
- Comparative vertebrate anatomy - Comparative Vertebrate Anatomy is a comparative study of the anatomical and morphological features of vertebrates. This area of study usually includes the Amphioxus (a Cephalochordate), Sea squirts (a Urochordate), and Balanoglossus), a member of the phylum Hemichordata.