ok,

just to check if i got it. In this website
http://www.gastropods.com/0/Shell_1930.html

the first photograph is actually a N. poligonatus (Poppe's
photo)
and the other two are N. vibex.

Now i see the diferences! thanks!!


Fabio W.


--- marlo <[log in to unmask]> escreveu:

> Fabio,
>
>
>
> When I initially stated collecting intensely in the early 90's
> I frequently
> came across a peculiar form of N. vibex.  It was always
> somewhat larger than
> usual and the populations were consistently composed of
> darker, charcoal
> grey shells, as opposed to other populations that always
> showed a variety of
> colors from whitish-yellow with reddish-brown markings
> (including a broken
> dark color band around the periphery of the body whorl) to
> solid, dark
> chocolate.  The parietal shield of the former was always
> slightly larger
> with a consistent dark blotch between 10:00 and 1:00.  The
> parietal shields
> of the latter populations varied from all white to white with
> a dark blotch
> between 10:00 and 1:00.
>
>
>
> When I finally sent some to Harry, he enlightened me about N.
> polygonatus.
> The characteristic broad and rounded parietal shield of
> polygonatus versus
> the rather truncated parietal shield of vibex is consistent
> and apparent.
> I've collected thousands of both species and with familiarity
> they become
> readily separable with only a glance.
>
>
>
> Marlo
>
>
>




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