superphylum of bilateral animals
(Redirected from Deuterostomia)
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.