Ambulacrarians Temporal range: Late Ediacaran - Recent
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Various starfish and sea urchins among | |
Scientific classification | |
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Superphylum: | Ambulacraria
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The Ambulacraria is a clade of invertebrates which includes echinoderms, hemichordates, and Xenoturbellida. This superphylum is largely identical to the superphylum Deuterostomia, except the phylum Chordata is not found in Ambulacraria.
There three living phyla, with representative organisms, are:
- Phylum Echinodermata (starfish, 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)