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Some evolutionary trends in caligid copepods
Kabata, Z. (1988). Some evolutionary trends in caligid copepods, in: Boxshall, G.A. et al. Biology of copepods: Proceedings of the third international conference on Copepoda. Developments in Hydrobiology, 47: pp. 617-622. http://dx.doi.org/10.1007/978-94-009-3103-9_72
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/Boston/London. ISBN 978-94-010-7895-5; e-ISBN 978-94-009-3103-9. XII, 639 pp. https://dx.doi.org/10.1007/978-94-009-3103-9, more
In: Dumont, H.J. (Ed.) Developments in Hydrobiology. Kluwer Academic/Springer: The Hague; London; Boston; Dordrecht. ISSN 0167-8418, more

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Keywords
    Appendages
    Biological phenomena > Evolution
    Parasites
    Caligidae Burmeister, 1835 [WoRMS]; Copepoda [WoRMS]
    Marine/Coastal

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  • Kabata, Z.

Abstract
    The genera Caligus and Lepeophtheirus can be used to illustrate some evolutionary trends. The most striking example of these trends is a gradual reduction of the fourth thoracopod. now largely functionless. All stages of this reduction can be found in Caligidae. Other, apparently correlated, changes are also present. For example, reduction in the armature of the first thoracopod occurs mainly among species in which the fourth exopod has become twosegmented, though still retaining the seta associated with the original three-segmented structure.

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