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image of Journal of Crustacean Biology

ABSTRACT Observations on the morphology and reproduction of a marine cladoceran, Podon schmackeri, were carried out on specimens sorted from the C.S.K. International Zooplankton Samples. Parthenogenetic females of Podon schmackeri ranged from 0.30-0.65 mm in standard length (SL) and from 0.34-0.87 mm in gross length (GL). The number of parthenogenetic embryos varied from 1-9 per batch, with a mean of 4.6. Some individuals exhibited paedogenesis, in that advanced embryos in the brood pouch contained their own embryos in the embryonic brood space. Two males of Podon schmackeri, measuring 0.42 and 0.43 mm in SL and 0.43 and 0.46 mm in GL, respectively, were detected, and described and illustrated for the first time.


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