Abstract
BOTANISTS have postulated polyploidy as an adaptation to cold; but it has been shown that in ferns polyploids occur more frequently in Ceylon than in western Europe1. Little or no geographical analysis has been attempted of the occurrence of atypical caryotypes in insects outside the genus Drosophila, although in the shieldbug genus Thyanta three neo-tropical species have 2n = 14 while three Nearctic species have 2n = 16, 16 and 27 respectively2.
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References
Manton, I., Symp. Soc. Exp. Biol., 7, 174 (1953).
Schrader, F., and Hughes-Schrader, S., Chromosoma, 7, 469 (1956).
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LESTON, D. Geographical Zonation of Atypical Caryotypes in Shieldbugs. Nature 178, 933–934 (1956). https://doi.org/10.1038/178933b0
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DOI: https://doi.org/10.1038/178933b0
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