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
Dana, J. D., Proc. Amer. Acad. Arts Sci., 2, 9 (1849).
Caporiacco, L. di, Bull. Inst. Oceanogr. Monaco, No. 740, 1 (1938).
Steuer, A., Thalassia, Jena, 1, No. 4, 9 (1932).
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Calman, W. T., Brit. Antarct. ("Terra Nova") Exp. 1910, Nat. Hist. Rep., Zool., 3, 137 (1917).
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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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