The hemichordates are marine invertebrate organisms forming a phylum within the ‘Deuterostomia’; they comprise two classes, Pterobranchia and Enteropneusta.
Keywords: hemichordata; pterobranchia; enteropneusta; acorn worms; tomaria
Hemichordata (Acorn Worms)
Ulrich Welsch, Ludwig‐Maximilians University of Munich, Munich, Germany
Published online: April 2001
DOI: 10.1038/npg.els.0001617
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Figure 1. A diagrammatic drawing of the body plan of the hemichordata, (a) Pterobranchia, (b) Enteropneusta. Due to their considerable length, the stalk of the Pterobranchia and the metasoma of Enteropneusta have not been drawn in complete length. Numerous epidermal cells are of glandular nature as indicated by fine stippling.
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| Further Reading | |
| Balser EJ and Ruppert EE (1990) Structure, ultrastructure, and function of the preoral heart-kidney in Saccoglossus kowalewskii (Hemichordata, Enteropneusta) including new data on the stomochord. Acta Zoologica 71: 235–249. | |
| book Benito J and Pardos F (1997) "Hemichordata". In: Harrison FW (ed.) Microscopic Anatomy of Invertebrates, vol. 15, pp. 15–101. New York: Wiley Liss. | |
| Dilly PN, Welsch U and Rehkämper G (1986) On the fine structure of the alimentary tract of Cephalodiscus gracilis (Pterobranchia, Hemichordata). Acta Zoologica 67: 87–95. | |
| book Ruppert EE and Barnes RD (1994) "Hemichordata". In: Invertebrate Zoology, 6th edn, pp. 865–877. Philadelphia, PA: Saunders. | |
| book Nielsen C (1995) "Pterobranchia (chap. 47); Enteropneusta (chap. 50)". In: Animal Evolution. Oxford: Oxford University Press. | |
| book Welsch U (1984) "Hemichordata". In: Biology of the Integument, vol. 1, pp. 790–799. Heidelberg, Germany: Springer Verlag. | |
