Abstract
We investigated brain development in the horseshoe crab Limulus polyphemus and several other arthropods via immunocytochemical methods, i.e. antibody stainings against acetylated α-tubulin and synapsin. According to the traditional view, the first appendage-bearing segment in chelicerates (the chelicerae) is not homologous to the first appendage-bearing segment of mandibulates (first antenna, deutocerebrum) but to the segment of the second antenna (tritocerebrum) or the intercalary segment in hexapods and myriapods. Accordingly, the segment of the deutocerebrum in chelicerates would be completely reduced. The main arguments for this view are: (1) the postoral origin of the cheliceral ganglion, (2) a poststomodaeal commissure, and (3) a connection of the cheliceral ganglion to the stomatogastric system. Our data show that these arguments are not convincing. During the development of horseshoe crabs there is no evidence for a former additional segment in front of the chelicerae. Instead, comparison of the brain structure (neuropil ring) between chelicerates, crustaceans and insects shows remarkable similarities. Furthermore, the cheliceral commissure in horseshoe crabs runs mainly praestomodaeal, which would be unique for a tritocerebral commissure. An unbiased view of the developing nervous system in the "head" of chelicerates, crustaceans and insects leads to a homologisation of the cheliceral segment and that of the (first) antenna (= deutocerebrum) of mandibulates that is also congruous to the interpretation of the Hox gene expression patterns. Thus, our data provide morphological evidence for the existence of a chelicerate deutocerebrum.
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Acknowledgements
We thank Robert B. Barlow (Woods Hole, Syracuse) for his extensive support while collecting eggs of Limulus polyphemus in Woods Hole. The scientific work in Woods Hole was partly supported by the National Science Foundation (USA) and the National Institute of Health (USA; both grants to Robert B. Barlow). Andreas Mölich (Institut für Tierphysiolgie, Humboldt-Universität) and Ekkehard Richter (Institut für Membranphysiologie) were very patient during confocal microscopy. The synorf1 antibody was a generous gift of Erich Buchner (Institut für Genetik, Würzburg). First eggs of Triops cancriformis were kindly provided by Erich Eder (Institut für Zoologie, Universität Wien). Preparation of Penaeus monodon was done by Frederike Alwes. Furthermore, we thank Richard H. Thomas (London) and Gregory Edgecombe (Sydney) for helpful comments and for linguistic assistance. This work was supported by the Deutsche Forschungsgemeinschaft (Scho442/7–1, Scho442/7–2).
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Mittmann, B., Scholtz, G. Development of the nervous system in the "head" of Limulus polyphemus (Chelicerata: Xiphosura): morphological evidence for a correspondence between the segments of the chelicerae and of the (first) antennae of Mandibulata. Dev Genes Evol 213, 9–17 (2003). https://doi.org/10.1007/s00427-002-0285-5
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DOI: https://doi.org/10.1007/s00427-002-0285-5