Abstract
AMONG the Branchiopoda it is now well known that the Anostraca swim normally lying on the back, while the Notostraca swim with the back directed upwards. Orientation is also constant among the Cladocera, but there are here considerable differences between genera.
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References
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Lochhead, J. Body Orientation of the Lower Crustacea (Branchiopoda). Nature 138, 232–233 (1936). https://doi.org/10.1038/138232a0
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DOI: https://doi.org/10.1038/138232a0