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Nassarius incrassatus - the bump - Printable Version

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Nassarius incrassatus - the bump - BubikolRamios - 01-14-2012

this have a bump:
http://agrozoo.net/jsp/Galery_one_image.jsp?id_galery_obfuscated=b36279992ba74728a7c041d50b5886e4

See attached group, only one with bump, what does that mean, if anything ?

EDIT: Ok , educated myself (-:, the bump is called Varix,
http://en.wikipedia.org/wiki/Varix_%28mollusc%29
and should be species specific ? Hence attached image more interesting. That is , mybe 'the others' did not have any resting stages jet ?