ASPERSA
snail shells are a spiral tube around an imaginary axis that have a variety of ways, shapes, colors ... but they all have a common structure and fundamental, I mean, if there is a shell close spiral, one can distinguish several layers, these layers do not have the same growth rate, does not make the layers at the same speed, which means that the shell grows faster by a party other and therefore form a spiral. Saturday, February 19, 2011
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The shell rotation is in the sense of a clock (dextran), and very rarely in the opposite direction (sinistra). Most gastropods have a shell to the right and only a small number of species has a curl to the left.
columellar muscle
The conch shell is attached to the columellar muscle. If this muscle gives way, the shell is separated from its shell and dies.
Source:
Gireaud (free translation link http://www.gireaud.net/es/coquille_es.htm )
http://www.helix-pomatia.de/
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