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

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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 (Ag 5 ) 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.

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Authors and Affiliations

  1. USDA, ARS, Grain Marketing and Production Research Center, Manhattan, KS 66502, USA, , , , ,

    M. Susan Haas & Richard W. Beeman

  2. Division of Biology, Ackert Hall, Kansas State University, Manhattan, KS 66506, USA, , , , ,

    Susan J. Brown

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  1. M. Susan Haas
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  2. Susan J. Brown
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  3. Richard W. Beeman
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Haas, M., Brown, S. & Beeman, R. Homeotic evidence for the appendicular origin of the labrum in Tribolium castaneum . Dev Genes Evol 211, 96–102 (2001). https://doi.org/10.1007/s004270000128

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  • DOI: https://doi.org/10.1007/s004270000128

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