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Morphological divergence in giant fossil dormice.

Jesse J Hennekam1, Roger B J Benson2, Victoria L Herridge3

  • 1Hull York Medical School, University of York, York, UK.

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Insular gigantism in dormice shows that evolutionary increases in body size are not just due to allometry. Distinctive cranial and mandibular shapes evolved, suggesting adaptations in feeding ecology.

Keywords:
HypnomysLeithiaallometrygeometric morphometricsinsular gigantismisland rule

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Area of Science:

  • Evolutionary biology
  • Paleontology
  • Island biogeography

Background:

  • Insular gigantism, an increase in body size in island populations, is poorly understood.
  • Mediterranean islands host numerous examples of giant dormice, both fossil and extant.

Purpose of the Study:

  • To investigate the role of allometry in the cranial and mandibular morphology of giant insular dormice.
  • To determine if island gigantism is solely an extrapolation of mainland allometric trends.

Main Methods:

  • Quantified cranial and mandibular shape patterns in mainland and insular dormouse populations.
  • Analyzed the relationship between morphology and head size (allometry).

Main Results:

  • Gigantism in dormice is not solely explained by extrapolating mainland allometric trajectories.
  • Significant population- or species-specific evolutionary shape changes contribute to the distinct morphology of island giants.
  • Increased body size in insular dormice is linked to evolutionary divergence in feeding adaptations, from faunivorous to herbivorous diets.

Conclusions:

  • Insular gigantism involves context-dependent phenotypic modifications beyond simple allometry.
  • The evolution of giant dormice highlights the unique adaptive pathways and ecological divergence on islands.
  • Island faunas exhibit highly distinctive evolutionary trajectories.