Abstract
IN October 1947 the Ministry of Agriculture and Fisheries Research Ship Sir Lancelot when on a plankton cruise collected many specimens of a cladoceran never before found in the North Sea. They were all from a single station near the Dutch coast at 52° 22â N., 04° 20â E.; moreover, all were females, many with young in the brood pouches (see accompanying illustration); no males were seen. The cladoceran remained unidentified until July 1948, when it was referred by the second of us to Penilia avirostris Dana.
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References
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CATTLEY, J., HARDING, J. Penilia, a Cladoceran Normally Found off Tropical and Sub-tropical Coasts, Recorded in North Sea Plankton. Nature 164, 238–239 (1949). https://doi.org/10.1038/164238a0
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DOI: https://doi.org/10.1038/164238a0
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