Evolution of asymmetry in organisms Asymmetry

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fiddler crab, uca pugnax



most snails, because of torsion during development, show remarkable asymmetry in shell , in internal organs.
fiddler crabs have 1 big claw , 1 small claw.
the narwhal s tusk left incisor can grow 10 feet in length , forms left-handed helix.
flatfish have evolved swim 1 side upward, , result have both eyes on 1 side of heads.
several species of owls exhibit asymmetries in size , positioning of ears, thought locate prey.
many animals (ranging insects mammals) have asymmetric male genitalia. evolutionary cause behind is, in cases, still mystery.




^ schilthuizen, menno (2013). gone awry: unsolved mysteries in evolution of asymmetric animal genitalia . animal biology. 63 (1): 1–20. doi:10.1163/15707563-00002398. 






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