deuterostome

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Related to Deuterostomia: Bilateria, Protostomia

deuterostome

(do͞o′tə-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.
References in periodicals archive ?
For more than a century, the Bilateria have traditionally been divided into Protostomia and Deuterostomia (or through a misinterpretation of Hyman, 1951, into Acoelo-mata, Pseudocoelomata, and Eucoelomata.
Therefore, specification of differentiation fate along the anterior-posterior axis by Hox genes need not have evolved independently in Protostomia and Deuterostomia, as required under Nielsen's rendition of the larval-first hypothesis.
However, we failed to identify asporin, fibronectin, matrilin, osteomodulin, podocan, reelin, or vitronectin in any protostome animals, suggesting that these ECM proteins may have originated within the Deuterostomia.
Phylo-genetic analyses indicate that the p63 gene is ancestral to the divergence of the Ecdysozoa, Lophotrochozoa, and Deuterostomia (Aguinaldo et al.