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Development of functional adaptation to clasping behaviour in harpacticoid copepods (Copepoda, Harpacticoida)
Dahms, H.-U. (1988). Development of functional adaptation to clasping behaviour in harpacticoid copepods (Copepoda, Harpacticoida), in: Boxshall, G.A. et al. (Ed.) Biology of copepods: Proceedings of the Third International Conference on Copepoda. Developments in Hydrobiology, 47: pp. 505-513. hdl.handle.net/10.1007/978-94-009-3103-9_57
In: Boxshall, G.A.; Schminke, H.K. (Ed.) (1988). Biology of copepods: Proceedings of the Third International Conference on Copepoda. Developments in Hydrobiology, 47. Kluwer Academic Publishers: Dordrecht. ISBN 90-6193-654-3. XII, 639 pp.
In: Dumont, H.J. (Ed.) Developments in Hydrobiology. Kluwer Academic/Springer: The Hague; London; Boston; Dordrecht. ISSN 0167-8418

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Trefwoorden
    Biogeny > Phylogeny
    Morphogenesis
    Marien; Zoet water
Author keywords
    Antennule; Clasping; Postembryonic development

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  • Dahms, H.-U.

Abstract
    The copepodite antennule development of several harpacticoid families is studied and male antennule development of 5 species is schematically illustrated. The origin of newly formed segments can be determined by seta numbers of segments, relative segment length, furrows indicating previous articulations and by the position of the segment which bears the proximal aesthetasc. At least in some species sexual dimorphism of antennules is present from C II onwards. Females practically reach the adult antennular stale at C V whereas males undergo drastic changes from C V to C VI with proximal addition of segments, and often with distal fusions and formation of a unique armature due to functional adaptations in clasping behaviour. No correlation has been found between clasping mode, male antennule type and taxonomic level. In closely related species of the same genus both chirocer and subchirocer antennules are found. The postnaupliar development of the chirocer type can proceed along different ways. Consequently it is suggested that at least chirocer antennules have originated several times independently during harpacticoid evolution.

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