deu·ter·o·stome 
(dtə-rō-stōm′)
(dtə-rō-stōm′)n.
Any of a numerous animals of the group Deuterostomia, in which the anus develops from the first opening in the embryo and the mouth develops later, and including the echinoderms, hemichordates, and chordates.
[From New Latin Deuterostomia, taxon name : DEUTERO- + New Latin stoma; see STOMA.]