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On the morphology of the central nervous system in larval stages ofCarcinus maenas L. (Decapoda, Brachyura)

Helgoländer Meeresuntersuchungen volume 47, pages 61–79 (1993)Cite this article

Abstract

We investigated the morphology of the central nervous system throughout the larval development ofCarcinus maenas. For that purpose single larvae were reared in the laboratory from hatching through metamorphosis. Complete series of whole mout semithin sections were obtained from individuals of all successive larval stages and analysed with a light microscope. Morphological feature and spatial arrangement of discernable neural cell clusters, fibre tracts and neuropile are described and compared with the adult pattern. We found that most of the morphological features characterizing the adult nervous system are already present in the zoea-1. Nevertheless, there are marked differences with respect to the arrangement of nerve cell bodies, organization of cerebral neuropile, and disposition of ganglia in the ventral nerve cord. It appears that complexity of the central nervous neuropile is selectively altered during postmetamorphotic development, probably reflecting adaptive changes of sensory-motor integration in response to behavioural maturation. In contrast, during larval development there was little change in the overall structural organization of the central nervous system despite some considerable growth. However, the transition from zoea-4 to megalopa brings about multiple fundamental changes in larval morphology and behavioural pattern. Since central nervous integration should properly adapt to the altered behavioural repertoire of the megalopa, it seems necessary to ask in which respect synaptic rearrangement might characterize development of the central nervous system.

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  1. Department of Neuroanatomy, Faculty of Biology, University of Bielefeld, Postbox 1001 31, D-W-4800, Bielefeld, Federal Republic of Germany

    S. Harzsch &  R. R. Dawirs

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  1. S. Harzsch
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Harzsch, S., Dawirs, R.R. On the morphology of the central nervous system in larval stages ofCarcinus maenas L. (Decapoda, Brachyura). Helgolander Meeresunters 47, 61–79 (1993). https://doi.org/10.1007/BF02366185

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Helgoland Marine Research

ISSN: 1438-3888

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