Deuterostome

Superphylum of bilateral animals

Deuterostomes (from Ancient Greek δεύτερος (deúteros) 'second' and στόμα (stóma) 'mouth') are bilaterian animals of the superphylum Deuterostomia, which are typically characterized by their blastopore becoming their anus during embryonic development. Deuterostomia comprises three phyla: Chordata, Echinodermata, Hemichordata, and the extinct clade Cambroernida. In deuterostomes, the developing embryo's first opening (the blastopore) becomes the anus and cloaca, while the mouth is formed at a different site later.

From Wikipedia, under CC BY-SA. More on occurri.