Temporal range: late Ediacaran – Recent
|A Sea cucumber|
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.
There are these living phyla of deuterostomes:
- Chordata (vertebrates and their kin)
- Echinodermata (starfishes, sea urchins, sea cucumbers, etc.)
- Hemichordata (acorn worms and possibly graptolites)
- Xenoturbellida (2 species of worm-like animals)
Images for kids
All chordates (which includes all vertebrates), such as birds and mammals, are deuterostomes. Shown here is a barred owl.
Deuterostome Facts for Kids. Kiddle Encyclopedia.