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| Ambulacrarians Fossil range: Late Ediacaran - Recent |
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| Various sea stars and sea urchins among mussel shells in the rocky intertidal zone of Kachemak Bay. | |
| Scientific classification | |
| Kingdom: | Animalia |
| Subkingdom: | Eumetazoa |
| (unranked): | Bilateria |
| Superphylum: | Ambulacraria |
| Phyla | |
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Ambulacraria is a clade of invertebrates which includes echinoderms, hemichordates, and Xenoturbellida; a member of this group is called an ambulacrarian. This superphylum is largely identical to the superphylum Deuterostomia, except the phylum Chordata is not found in Ambulacraria.
The three living phyla, with representative organisms, are:
- Phylum Echinodermata (sea stars, sea urchins, brittle stars, sea cucumbers, feather stars, sea lilies, etc.)
- Phylum Hemichordata (acorn worms, Pterobranchia, and possibly graptolites)
- Phylum Xenoturbellida (two species of worm-like animals)
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