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Roux's archives of developmental biology

, Volume 199, Issue 6, pp 349–363 | Cite as

Segmentation, neurogenesis and formation of early axonal pathways in the centipede,Ethmostigmus rubripes (Brandt)

  • Paul M. Whitington
  • Thomas Meier
  • Peter King
Article

Summary

We have examined the embryo of the centipedeEthmostigmus rubripes to determine the degree of evolutionary conservatism in the developmental processes of segmentation, neurogenesis and axon formation between the insects and the myriapods. A conspicuous feature of centipede embryogenesis is the early separation of the left and right sides of the ganglionic primordia by extra-embryonic ectoderm. An antibody to the protein encoded by theDrosophila segmentation geneengrailed binds to cells in the posterior margin of the limb buds in the centipede embryo, in common with insect and crustacean embryos. However, whereas in insects and crustaceans this protein is also expressed in a subset of cells in the neuroectoderm, the anti-engrailed antibody did not bind to cells in the ganglionic primordia of the centipede embryo. Use of the BrdU labelling technique to mark mitotically active cells revealed that neuroblasts, the ubiquitous neuron stem cell type in insects, are not present in the centipede. The earliest central axon pathways in the centipede embryo do not arise from segmentally repeated neurons, as is the case in insects, but rather by the posteriorly directed growth of axons originating from neurons located in the brain. Axonogenesis by segmental neurons begins later in development; the pattern of neurons involved is not obviously homologous to the conservative set of central pioneering neurons found in insects. Our observations point to considerable differences between the insects and the myriapods in mechanisms for neurogenesis and the formation of central axon pathways, suggesting that these developmental processes have not been strongly conserved during arthropod evolution.

Key words

Centipedes Myriapod embryogenesis Neurogenesis Segmentation Axon growth 

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Copyright information

© Springer-Verlag 1991

Authors and Affiliations

  • Paul M. Whitington
    • 1
  • Thomas Meier
    • 2
  • Peter King
    • 1
  1. 1.Department of ZoologyUniversity of New EnglandArmidaleAustralia
  2. 2.Laboratoire de NeurobiologieUniversity of GenevaGenevaSwitzerland

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