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Tue, 19 Sep 2000 06:18:05 -0400 |
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Dear Morton et al.,
There is a brief mention of the occurrence of "normal" perturbations of
chirality in the webpages at <http://home.sprynet.com/~wfrank/reverse.htm>.
An classic but short paper on the occurrence of "normal" sinistrality in
evolutionary and phylogenetic context is:
Vermeij, G. J., 1975. Evolution and distribution of left-handed and
planispiral coiling in snails. Nature 254(5499): 419-420. April 3.
A more extensive account of "normal" and mutant reverse coiling is:
Robertson, R., 1993. Snail handedness. National Geographic Research and
Exploration 9(1): 104-119.
Mutant sinistrality is discussed at greater length in:
Gould, S. J., Young, N. D., and Kasson, B., 1985. The consequences of
being different: sinistral coiling in Cerion. Evolution 39(6): 1364-1379.
(I think this is the same Bill Kasson I roomed with at COA '97; correct,
Tom Watters?)
And finally, a theory of species origination based on mutant coiling is
explored in:
Gittenberger, E., 1988. Sympatric speciation in snails: a largely
neglected model. Evolution 42(4): 826-828.
Harry
At 10:18 PM 9/18/00 -0400, you wrote:
>I'm looking at shells from an evolutionary standpoint. There are so many
>right handed shells and so very very few left handed shells - worldwide
>(which rules out Coreolis effect as a cause). The most common example of a
>"lefty" here in Florida is Busycon contrarium (sinistrum). Any thoughts on
>why this should be so would be welcome to me and maybe to the list.
>Mort Kessel
Harry G. Lee
Suite 500
1801 Barrs St.
Jacksonville, FL 32204
USA 904-384-6419
<[log in to unmask]>
Visit the Jacksonville Shell Club Home Page at:
http://home.sprynet.com/~wfrank/jacksonv.htm
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