Shroom^Δ11 mutant stage 8 embryos have reduced convergent extension resulting in a smaller increase in tissue length to width ratio compared to wild type. In contrast, tissue length along the anterior posterior axis is only slightly reduced. Shroom^Δ11 mutants exhibit defects in convergent extension cell rearrangement: there is a strong reduction in rosette behaviors (resulting from the contraction of multiple consecutive edges), but little change in local neighbour exchange (resulting from single edge contraction events). Cells in Shroom^Δ11 mutants have more neighbours on average midway through elongation. Intercalating cells in Shroom^Δ11 mutant embryos have a slightly larger apical area during elongation, with no difference between wild type and mutant cells before elongation.