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Cranial variation in British mustelids.

S Lee1, P J Mill

  • 1School of Biology, University of Leeds, Leeds LS2 9JT, UK.

Journal of Morphology
|March 31, 2004
PubMed
Summary

Skull morphology in seven mustelid species reveals distinct groupings. Size-independent analysis effectively differentiates species like badgers, weasels, stoats, and otters based on cranial measurements.

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Area of Science:

  • Comparative osteology
  • Mammalian evolutionary biology
  • Zoology

Background:

  • Mustelidae family exhibits diverse cranial morphologies.
  • Understanding interspecies variation is crucial for taxonomy and evolutionary studies.
  • Previous studies often focused on limited species or specific cranial features.

Purpose of the Study:

  • To analyze and differentiate skull morphology across seven mustelid species.
  • To identify key cranial measurements that distinguish between species.
  • To assess the influence of size on skull shape variation and sexual dimorphism.

Main Methods:

  • Nineteen cranial measurements were taken from 136 skulls representing seven mustelid species.
  • Size-related effects were removed by dividing measurements by their geometric means.
  • Canonical variate analysis (CVA) was employed to visualize interspecies distinctions.

Main Results:

  • CVA effectively separated mustelid species into distinct groups based on skull shape.
  • Key differentiating measurements included zygomatic arch width, sagittal crest height, postorbital distance, and condylobasal length.
  • Ferret and polecat-ferret hybrids clustered closely with polecats; sexual dimorphism in badgers was less significant than interspecific differences.

Conclusions:

  • Skull shape, independent of size, provides robust characters for distinguishing mustelid species.
  • Canonical variate analysis is a powerful tool for exploring multivariate cranial variation.
  • The study clarifies phylogenetic relationships within the studied mustelid groups.

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