Development Genes and Evolution

, Volume 211, Issue 2, pp 96–102

Homeotic evidence for the appendicular origin of the labrum in Tribolium castaneum

  • M. Susan Haas
  • Susan J. Brown
  • Richard W. Beeman
Short Communication

Abstract.

The ontogeny of the insect labrum, or upper lip, has been debated for nearly a century. Recent molecular data suggest a segmental appendage origin of this structure. Here we report the first arthropod mutation associated with a homeotic transformation of the labrum. Antennagalea-5 (Ag5) transforms both antennal and labral structures to resemble those of gnathal appendages in Tribolium castaneum. This labral transformation suggests that the labrum is a fused structure composed of two pairs of appendage endites, and is serially homologous to the gnathal appendages.

Insect head Homeotic transformation Mandible Labrum Appendage 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Copyright information

© Springer-Verlag 2001

Authors and Affiliations

  • M. Susan Haas
    • 1
  • Susan J. Brown
    • 2
  • Richard W. Beeman
    • 1
  1. 1.USDA, ARS, Grain Marketing and Production Research Center, Manhattan, KS 66502, USA
  2. 2.Division of Biology, Ackert Hall, Kansas State University, Manhattan, KS 66506, USA

Personalised recommendations