The Spiralia are a morphologically diverse clade of protostome animals, including within their number the molluscs, annelids, platyhelminths and other taxa.[4] The term Spiralia is applied to those phyla that exhibit canonical spiral cleavage, a pattern of early development found in most (but not all) members of the Lophotrochozoa.[5]
^Telford, Maximilian J. (2019). "Evolution: Arrow Worms Find Their Place on the Tree of Life". Current Biology. 29 (5): R152–R154. doi:10.1016/j.cub.2018.12.029. PMID 30836082.
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Fedonkin, M.A.; Waggoner, B.M. (28 August 1997). "The Late Precambrian fossil Kimberella is a mollusc-like bilaterian organism". Nature. 388 (6645): 868. Bibcode:1997Natur.388..868F. doi:10.1038/42242. S2CID 4395089.
^Fedonkin, M.A.; Simonetta, A.; Ivantsov, A.Y. (2007). "New data on Kimberella, the Vendian mollusc-like organism (White Sea region, Russia): palaeoecological and evolutionary implications" (PDF). Geological Society, London, Special Publications. 286 (1): 157–179. Bibcode:2007GSLSP.286..157F. doi:10.1144/SP286.12. S2CID 331187. Archived from the original (PDF) on 22 November 2012. Retrieved 10 July 2008.