Netherland Journal of Aquatic Ecology

, Volume 29, Issue 2, pp 161–166 | Cite as

Aberrant individuals ofNeomysis integer and other Mysidacea: Intersexuality and variable telson morphology

  • Jan Mees
  • Nancy Fockedey
  • Ann Dewicke
  • Colin R. Janssen
  • Jean-Claude Sorbe
Ecology of the River Meuse


Intersexuality in the mysidNeomysis integer is described from samples collected in the Elbe (north Germany), Eems-Dollard (north Netherlands), Westerschelde (south-west Netherlands) and Gironde (southwest France) estuaries. Individuals which had an irregularly shaped or nearly symmetrically rounded telson, rather than a typically truncated one, were also recorded from the four populations studied. A culture experiment with damaged specimens revealed that all types of abnormal telson morphology found in the field can result from regeneration of damaged parts. It is concluded that both intersexuality and aberrant telson morphology are widespread phenomena among estuarineN. integer populations. Both abnormalities seem to be rare in the other common mysid species in the study area: only one intersexualGastrosaccus spinifer and oneSchistomysis kervillei with an aberrant telson were recorded.


mysid estuary morphology regeneration 


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Copyright information

© Kluwer Academic Publishers 1995

Authors and Affiliations

  • Jan Mees
    • 1
  • Nancy Fockedey
    • 1
  • Ann Dewicke
    • 1
  • Colin R. Janssen
    • 2
  • Jean-Claude Sorbe
    • 3
  1. 1.Marine Biology Section, Zoology InstituteUniversity of GhentGentBelgium
  2. 2.Laboratory for Biological Research in Aquatic PollutionUniversity of GhentGentBelgium
  3. 3.Laboratoire d'Océanographie BiologiqueUniversité de Bordeaux 1ArcachonFrance

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