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Perspectives on hyperphalangy: patterns and processes.

Tim J Fedak1, Brian K Hall

  • 1Department of Biology, Dalhousie University, Halifax, Nova Scotia, Canada. tfedak@dal.ca

Journal of Anatomy
|March 23, 2004
PubMed
Summary
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Hyperphalangy, or extra finger bones, occurs in secondarily aquatic vertebrates with flipper limbs. This digit morphology results from developmental processes maintaining limb structure and promoting digit elongation.

Area of Science:

  • Evolutionary biology
  • Developmental biology
  • Paleontology

Background:

  • Hyperphalangy is a digit morphology characterized by an increased number of phalanges.
  • This trait has been observed in various fossil and extant taxa, particularly in secondarily aquatic vertebrates.

Purpose of the Study:

  • To analyze the patterns and processes of hyperphalangy.
  • To define and identify extreme hyperphalangy.
  • To clarify previous reports on hyperphalangy in cetacean embryos.

Main Methods:

  • Comparative analysis of hyperphalangy definitions and occurrences across diverse taxa.
  • Review of recent studies on terrestrial autopod joint induction.
  • Examination of developmental prerequisites and molecular factors involved in hyperphalangy.

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Main Results:

  • Extreme hyperphalangy (exceeding 4/6/6/6/6 phalanges) is exclusive to secondarily aquatic vertebrates with flipper limbs.
  • In extant cetaceans, hyperphalangy is limited to digits II and III.
  • Embryonic hyperphalangy reports are clarified as non-ossified cartilaginous elements.

Conclusions:

  • Hyperphalangy development requires the absence of interdigital cell death and sustained secondary apical ectodermal ridge (AER) activity.
  • Molecular factors like BMPs, FGFs, and Wnt-14 are implicated in flipper limb maintenance and hyperphalangy induction.