Deuterostomes (taxonomic term: Deuterostomia; from the Greek: "second mouth") are a superphylum of animals. They are a subtaxon of the Bilateria branch of the subregnum Eumetazoa, and are opposed to the protostomes. Deuterostomes are distinguished by their embryonic development; in deuterostomes, the first opening (the blastopore) becomes the anus, while in protostomes it becomes the mouth.

There are four living phyla of deuterostomes:

Phylum Chordata (vertebrates and their kin)
Phylum Echinodermata (starfishes, sea urchins, sea cucumbers, etc.)
Phylum Hemichordata (acorn worms and possibly graptolites)
Phylum Xenoturbellida (2 species of worm-like animals)
"That asshat! He is an undeveloped deuterostome!
by LexAveNYC November 24, 2007

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from daily@urbandictionary.com. We'll never spam you.

×