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Porifera is the common ancestor. Porifera is a multicellular sponge. They do not possess true tissues. Scientists believe they first appeared about 760 million years ago.

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Cnidaria are extremely diverse and armed with stinging cells called nematocysts. They do possess true tissues, as well as a nerve nets and muscle cells. Scientists believe they first appeared about 580 million years ago.

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Platyhelminthes are also known as flat worms. They have symmetrical soft bodies. Scientists believe they first appeared about 550 million years ago.

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Annelida are also known as segmented worms. In the ocean, they either float, burrow, or wander on the bottom. Scientists believe they first appeared about 500 million years ago.

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Anthropoids are invertebrate animals with an exoskeleton. Scientists believe they first appeared about 500 million years ago.

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Chordata, at some point in their lifetime, possess 5 distinguishing characteristics: A notochord, dorsal hollow nerve chord, thyroid, pharyngeal slits, and a post-anal tail. Scientists believe they first appeared about 500 million years ago.