What species are not symmetric (left and right body sides are not identical or nearly so)?
by 
Halliburton Shill
ANSWERS: 9
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umm....human? oh wait no! The Fiddler Crab!! (Back of the net!)
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No animal is symmetric. Internal organs do not match symmetrically.
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A Flounder. It's a fish that lives on the bottom.
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fiddler crabs one huge claw, one small claw
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No species is truly symmetrical. Some things are born symmetrical but soon die due to their hearts inability to pump blood around their system.
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Your question seems to limit symmetry to bilateral symmetry only. Starfish and sea urchins are considered radially symetric rather than bilaterally symetric. I'm not sure if that was what you're looking for.
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How bout a tree, with its branches going every which way? Or my pet rock?:)
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The echinoderms, for example starfish and sea-urchins have a five-fold symmetry, and so it doesn't make a lot of sense to talk about their having a front and back, never mind left and right.
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All symmetry in organisms is approximate. In the context of this question hermit crabs are symmetrical. I believe that the entire phylum Porifera containing the sponges is not symmetrical in any way. Anthozoa (Corals and sea anemones) have either 6 or 8 fold symmetry. Plants usually have five fold symmetry (slice an apple horizontally and look), but some have bilateral symmetry. However, the five part symmetry is often complicated by growth perpendicular to the plane of symmetry, so that many plants grow as a helix. This helical growth (2/5 phyllotaxy) can be seen in many, many plants, where a pattern of five leaves repeats along the center stem, and every 6th leaf is approximately in the same position on the stem. This sort of helical growth occurs in plant cells also, and seems to mirror the arrangement of microtubules.
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