The bilateria /ˌbləˈtɪəriə/ are aw animals havin a bilateral symmetry, i.e. thay hae a front anda back end, as well as an upside an dounside.

Temporal range: EdiacaranPresent, 560–0 Ma[1]
Animal diversity October 2007.jpg
Diversity o bilaterians.
Scientific classification e
Kinrick: Animalia
Subkinrick: Eumetazoa
Clade: ParaHoxozoa
Clade: Bilateria
Hatschek, 1888

Triploblasts Lankester, 1873


  1. Martin, M. W.; Grazhdankin, D. V; Bowring, S. A; Evans, D. A; Fedonkin, M. A; Kirschvink, J. L. (5 May 2000). "Age of Neoproterozoic bilatarian [sic] body and trace fossils, White Sea, Russia: implications for metazoan evolution". Science. 288 (5467): 841–5. Bibcode:2000Sci...288..841M. doi:10.1126/science.288.5467.841. PMID 10797002.