I don't dispute your theory, but I would like to point out that I found the
form citrina in the midst of an entire "colony" popping out of the sand
north of Jacksonville, Florida. It would appear to me that the color form
was a member of the group of typical O. sayana, and probably shared the same
color of substrate.
I allow, however, that this does not necessarily guarantee that the color
form didn't come from another habitat.
On the same outing I collected a half dozen specimens that were almost dark
gray, very atypical! And, I found one specimen in the same group that was
corded around the last whorl.
Winston Barney
Fort Worth, Texas
----- Original Message -----
From: "Vervaet, Fred (Fred)" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, April 20, 2005 3:37 AM
Subject: Re: Oliva sayana forma citrina
> Doug,
> The colour from the Oliva species seems to originate from the substrate
they live on. In the book of Tursch & Greifeneder on Olive shells they show
an example of a black oliva oliva taken from back sand and placed on white
sand, will continue building the shell with white. The previous black colour
will however remain. More of these type of shells can be found, for instance
in Oliva minacea. Similar pictures are shown in this book of different
species of Oliva living on the same substrate and all showing the same
colouring of the shell. Seems like they read the substrate they are living
on...
> Greetings
> Fred Vervaet
> the Netherlands
>
> -----Original Message-----
> From: Conchologists List [mailto:[log in to unmask]]On Behalf Of
> Doug Stemke
> Sent: dinsdag 19 april 2005 19:58
> To: [log in to unmask]
> Subject: Oliva sayana forma citrina
>
>
> In "Olive Shells of the World" Zeigler notes that a live individual of O.
> sayana citrina placed in an aquarium reverted to the typical sayana
> coloration. I was wondering if this is an issue of the substate the Oliva
> is living in, a dietary issue, or, for that matter, something else.
>
> Thanks
>
> Doug
>
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