Animal Phylums with the Most Species

I suspect that 20, 000 extinct is actually much higher.

Number of species: 1,250,000+ extant and 20,000+ extinct

Also known as Arthropods

Number of species: 85,000 + extant and 80,000+ extinct

Also known as Mollusks

This is our phylum. This phylum consist of all Mammals, as well as all Reptiles, Amphibians, Birds, and Fish. 90% of the time, if you're asked to think of an animal off the top of your head, it's going to be in this phylum.

As well as vertebrates it also includes Tunicates which are sea squirts and scalps

Also known as Chordates

Also known as Flatworms

Also known as Roundworms

Number of species: 25,000

Also known as segmented worms

Number of species: 17,000 + extant

Also known as Cnidarians

Number of species: 10,800 extant

Also known as sponges

Also known as Echinoderms