Temporal range: late Ediacaran – Recent
|A sea cucumber|
|Phyla and clades|
They are bilateral animals, and are contrasted with the protostomes. Deuterostomes are distingued by their embryo: in deuterostomes, the first opening (the blastopore) becomes the anus, while in protostomes it becomes the mouth.
These are the living phyla of deuterostomes:
- Chordata (vertebrates and their kin)
- Echinodermata (starfishes, sea urchins, sea cucumbers, etc.)
- Hemichordata (acorn worms and possibly graptolites)
This is an extinct deuterostome clade:
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Deuterostome Facts for Kids. Kiddle Encyclopedia.