The HOX Genes in the acoelomorph Includes only one family of HOX genes are not present because they have not yet become part of the bilaterian genome at the time of the LCA include all the HOX...

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Extracted text: The HOX Genes in the acoelomorph Includes only one family of HOX genes are not present because they have not yet become part of the bilaterian genome at the time of the LCA include all the HOX families found in other bilateria, but not with as many variants have been lost since from the ancestral bilaterian We currently suspect that the last common ancestor of the bilateria was like an anthozoan polyp similar to a ctenophore O segmented /metameric O similar to a planula larva The embryos of the Xenoacoelomorpha display O indeterminate cleavage duet spiral cleavage O tetrad spiral cleavage determinate cleavage