Sea cucumbers (see figure) are classic hydrostats- cylindricalin shape with a body wall surrounding a constant volume of water.Many sea cucumber species crawl along the substrate usingperistaltic locomotion (waves of alternating muscle contraction)while some species burrow into the substrate, which requires forceto displace sediment. How might (a) the fiber angle of thecollagenous body wall and (b) the initial shape of the animalcorrelate with peristaltic locomotion versus burrowing?
