When large or stressed, placozoans can undergo binary fission (split into two individuals--sometimes three!) or bud to produce numerous multicellular flagellated "swarmers", which are capable of regenerating the amoeboid stage. However, this is not the complete life cycle, as there is also evidence of sexual reproduction. (Brusca and Brusca 2003; Ball and Miller 2010 and references therein) Sexual reproduction has not been observed in culture, but putative oocyte formation in degenerating animals is seen routinely. Population genetic analyses demonstrate allelic variation and evidence for genetic recombination in animals in the wild that is consistent with sex. (Signorovitch et al. 2005; Srivastava et al. 2008)
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