found: Work cat.: Developmental evolution of genetic regulation and signaling of the dorsoventral axis of protostomes and deuterostome, 2008:p. 6 (Bilateria)
found: McGraw-Hill concise encyclopedia of science and technology, viewed online Oct. 20, 2011(Bilateria)
found: Dictionary of developmental biology and embryology, viewed online, Oct. 20, 2011(Bilateria)
found: Penguin dictionary of biology, viewed online, Oct. 20, 2011(Bilateria)
found: Tree of Life Web Project, viewed Jan. 9, 2012(Bilateria; Triploblasts, bilaterally symmetrical animals with three germ layers; other names for Bilateria, Triploblastica)
found: NCBI taxonomy browser, Jan. 6, 2017(Bilateria. Rank: no rank. Lineage (full): cellular organisms; superkingdom Eukaryota; [no rank] Opisthokonta; kingdom Metazoa; [no rank] Eumetazoa)
found: ITIS, Jan. 6, 2017(Bilateria. Taxonomic rank: Subkingdom. Kingdom: Animalia. Direct children: Infrakingdom Deuterostomia; Infrakingdom Protostomia)
found: Wikipedia, Jan. 9, 2017(The Bilateria or bilaterians, or triploblasts, are animals with bilateral symmetry, i.e., they have a front ("anterior") and a back ("posterior") as well as an upside ("dorsal") and downside ("ventral"); therefore they also have a left side and a right side)
found: Budd, G.E. A critical reappraisal of the fossil record of the bilaterian phyla, in Biological reviews, May 2000, viewed online Jan. 9, 2017:p. 253 (Bilateria; bilaterians)
found: Chen, Y.-J. Small bilaterian fossils from 40 to 55 million years before the Cambrian, in Science, 9 July 2004, viewed online Jan. 9, 2017:p. 218 (bilaterian animals of the Early Cambrian; bilaterians)
