What he say?  What he say?  Harry jump right in there anytime.  Where's
my dictionary anyway?  Just kidding,  Verrrrry interesting. Thanks
Andrew.

Bob



Andrew Grebneff wrote:
>
> Dear Fabio
>
> No problemo. I will put this on Conch-L too.
>
> Distinguishing hyperstrophic dextral shells from orthostrophic (the normal
> mode of growtn in the vast majority of gastropods) sinistral ones is a
> problem; likewise distinguishing sinistral hyperstrophic from isostrophic
> dextral.
>
> The normally-hyperstrophic taxa that I can think of are: Macluritidae
> (fossils from early Paleozoic), Lanistes (Ampulariidae, freshwater),
> Limacina, Peracle and Planorbidae (sinistral hyperstrophic, appearing to be
> dextral); larvae of Architectonicidae, Pyramidellidae, some Mathildidae,
> opisthobranchs; and Ellobiidae, Trimusculidae, Siphonariidae
> (Basommatophoran so-called "pulmonates").
>
Etc. Etc. Etc.

Bob


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