>Thanks, Andrew. I feel more like a chordate now.

I'm glad that you do. These days I don't generally feel as though I
even have a notochord. More like a medusan (jellyfish)... with an
encephalization quotient to match.

>As you point out, it's good to bear in mind that coiling is not
>proprietary to gastropods, nor mollusks.

Come to think of it, plants... fern fronds are coiled; many plants'
clasping leafbases are arranged in a spiral, as may be flowers on a
spike and scales on araucarian trunks & branches. Brachiopods, some
caddisfly larval tubes (freshwater)...
--
Andrew Grebneff
Dunedin
New Zealand
Fossil preparator
Seashell, Macintosh, VW/Toyota van nut
‚ Opinions stated are mine, not of the University of Otago
"There is water at the bottom of the ocean"  - Talking Heads

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