Soesbergen M. 2019. Abnormalities in a Pleuroxus aduncus (Jurine, 1820) population (Crustacea: Cladocera: Chydoridae) // Invertebrate Zoology. Vol.16. No.3: 233–238 [in English].

European Invertebrate Survey Netherlands, Karveel 12–38, 8231 AS Lelystad, The Netherlands. E-mail:

doi: 10.15298/invertzool.16.3.04

ABSTRACT: The morphological variation in a population of Pleuroxus aduncus (Jurine, 1820) from a well in Germany is described. The number of denticles at the postero-ventral corner of the valve are more numerous than normal and abnormalities occur regularly. The observations are discussed in the context of the described variation in number of postero-ventral denticles of this species and the causes given for abnormalities in recent literature.

KEY WORDS: Cladocera, morphology, variation, isolation, Germany, The Netherlands.

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