A small phylum of marine invertebrates that comprises the acorn worms.
- The superphylum Deuterostomia contains the diverse phyla Chordata and Echinodermata and the minor phyla Hemichordata and Urochordata.
- The superphyla Deuterostomia (e.g., Chordata, Echinodermata, Hemichordata) and Protostomia each appear to have evolved from an ancestor with a coelomic body cavity.
- Metamorphosis in the acorn worms (Hemichordata, Enteropneusta) includes retention of the entire larval body, which sheds feeding and propulsory cilia and undergoes definitive shape changes.
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