deuterostome(redirected from Deuterosome)
Also found in: Medical.
Related to Deuterosome: Eumetazoa
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.]
any member of the major group of animals defined by the fact that during early embryonic development the first opening to form becomes the anus of the animal. The opposite is protostome
deu•ter•o•stome(ˈdu tər əˌstoʊm, ˈdyu-)
1. a mouth that develops separately from the blastopore.
2. an animal with this form of development, as an echinoderm or chordate.