Abstract
IN 1884 Ijima1 described Polycelis tenuis Ijima, a species which closely resembled the well-known P. nigra Ehrbg. More recently, interest in the legitimacy of this species has been shown by Continental workers, particularly Komarek2 and Sekera3. These two authors agreed that both P. nigra and P. tenuis are good species; but they differed on the external features whereby the species might be distinguished. Lender4 concluded that they could only be distinguished on the basis of internal anatomy and discounts such differences as shape of head, number of eyes and colour ; he also regarded them as ecologically similar. Latterly, Tu5 has questioned their separation as true species, but, like Lender, he found them in the same habitat on the Continent.
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References
Ijima, J., Z. Wiss. Zool., 40, 359 (1884).
Komarek, J., Zool. Anz., 70, 70 (1926).
Sekera, E., Zool. Anz., 72, 91 (1927).
Lender, Th., Arch. Zool. Exp. et Gén. Notes et Rev., 78 (2), 49 (1936).
Tu, T. J., Arch. Hydrobiol., 35 (1), 46 (1939).
Reynoldson, T. B., Nature, 162, 265 (1947).
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REYNOLDSON, T. British Species of Polycells (Platyhelminthes). Nature 162, 620–621 (1948). https://doi.org/10.1038/162620b0
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DOI: https://doi.org/10.1038/162620b0
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