>  Sorry, still confused. When you say "handedness" is related to temperature,
>  do you mean that one species lives in colder waters and another lives in
>  warmer waters?  Or do you mean that one and the same organism, with one and
>  the same genotype, is sinistral in one thermal situation, but dextral in
>  another?  If the latter, I see no basis for separating it/them into species?

There are multiple genotypes within the old "Neogloboquadrina pachyderma", the most famous example of a coiling direction-temperature link.

Darling,K.F., Kucera,M., Pudsey,C.J. and Wade,C.M. Molecular Evidence Links Cryptic Diversification in Polar Planktonic Protists to Quaternary Climate Dynamics. Proc. Natl. Acad. Sci. U.S.A. 101, 7657-7662 (2004)

Darling,K.F., Kucera,M., Wade,C.M., von Langen,P. and Pak,D. Seasonal distribution of genetic types of planktonic foraminifer morphospecies in the Santa Barbara Channel and its paleoceanographic implications. Paleoceanography (2003)

Kimoto,K. and Tsuchiya,M. Coiling direction changes in different generations of Neogloboquadrina pachyderma: Importance on paleoceanographic reconstruction from the evidence of laboratory cultivation and molecular phylogenetic analysis.  Published??[GenBank doesn't do too good a job of updating references]

Darling,K.F., Wade,C.M., Stewart,I.A., Kroon,D., Dingle,R. and Brown,A.J. Molecular evidence for genetic mixing of Arctic and Antarctic subpolar populations of planktonic foraminifers. Nature 405 (6782), 43-47 (2000).



    Dr. David Campbell
    Old Seashells
    University of Alabama
    Biodiversity & Systematics
    Dept. Biological Sciences
    Box 870345
    Tuscaloosa, AL  35487-0345 USA
    [log in to unmask]

That is Uncle Joe, taken in the masonic regalia of a Grand Exalted Periwinkle of the Mystic Order of Whelks-P.G. Wodehouse, Romance at Droitgate Spa

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