Time, pattern, and heterochrony: a study of hyperphalangy in the dolphin embryo flipper

@article{Richardson2002TimePA,
  title={Time, pattern, and heterochrony: a study of hyperphalangy in the dolphin embryo flipper},
  author={M. Richardson and H. A. Oelschläger},
  journal={Evolution & Development},
  year={2002},
  volume={4}
}
SUMMARY The forelimb of whales and dolphins is a flipper that shows hyperphalangy (numerous finger bones). Hyperphalangy is also present in marine reptiles, including ichthyosaurs and plesiosaurs. The developmental basis of hyper‐phalangy is unclear. Kükenthal suggested that phalanx anlagen split into three pieces during cetacean development, thereby multiplying the ancestral number. Alternatively, Holder suggested that apical ectodermal ridge (AER)‐directed limb outgrowth might be prolonged by… Expand
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