Noun
English Wikipedia has an article on:deuterostomeWikipedia
deuterostome (plural deuterostomes)
(zoology) Any animal, of the subphylum Deuterostomia, in which the initial pore formed during gastrulation becomes the anus, and the second pore becomes the mouth.
If chaetognaths branched off from the protostomes before they evolved their distinctive protostome embryonic characters, they may have retained deuterostome characters inherited from early bilaterian ancestors. Source: Internet
The traditional view was that lophophorates were a mix of protostome and deuterostome features. Source: Internet