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Hypothesis testing in evolutionary developmental biology: a case study from insect wings.

E L Jockusch1, K A Ober

  • 1Department of Ecology and Evolutionary Biology, 75 N. Eagleville Rd., U-3043, University of Connecticut, Storrs, CT 06269, USA. elizabeth.jockusch@uconn.edu

The Journal of Heredity
|September 25, 2004
PubMed
Summary
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Investigating insect wing evolution, this study clarifies how developmental similarities between species can arise from shared ancestry or convergent evolution. New data from Tribolium castaneum aid in distinguishing these origins.

Area of Science:

  • Evolutionary developmental biology
  • Morphological evolution
  • Insect wing development

Background:

  • Developmental data offer insights into morphological evolution but are time-consuming to collect, often leading to limited species comparisons.
  • Similarities in developmental patterns between distantly related species are typically inferred as ancestral traits.
  • Distinguishing between ancestral similarities and convergent evolution in developmental networks is challenging with sparse data.

Purpose of the Study:

  • To evaluate competing explanations for developmental similarities in insect wing evolution.
  • To test the assumption that wing development in Drosophila reflects ancestral traits for winged insects.
  • To investigate the roles of wingless and decapentaplegic genes in appendage allocation in Tribolium castaneum.

Main Methods:

Related Experiment Videos

  • Review of existing developmental data on insect wing evolution.
  • Comparative analysis of wing development across different insect species, including Drosophila and Tribolium castaneum.
  • Examination of gene function data, specifically focusing on wingless and decapentaplegic in Tribolium castaneum.

Main Results:

  • The study highlights the difficulty in distinguishing ancestral developmental patterns from convergent evolution without sufficient taxon sampling.
  • It reviews data relevant to the hypothesis that insect wings evolved from ancestral arthropod limb branches.
  • New data on gene function in Tribolium castaneum are presented to inform the debate on wing origins.

Conclusions:

  • Understanding the evolutionary origins of insect wings requires careful evaluation of developmental data to differentiate homology from homoplasy.
  • Comparative studies across a broader range of insect taxa are crucial for robustly inferring ancestral developmental processes.
  • The findings contribute to resolving the debate on whether insect wings arose from pre-existing limb structures.