Henk,
I think some of those early records are erroneous... but it would be
interesting if any later freshwater snail snoopers in Puerto Rico found
something like zebra.....which is very different than anything I've ever
seen from the Caribbean Basin....

Kurt

At 07:35 PM 8/11/04 +0200, you wrote:
>Gundlach, J., 1877, reported N. zebra from Puertorico near Aguadilla in
>freshwater. Jahrbuch der malakol. Gesellschaft, 4: 354.
>Henk K. Mienis
>
>----- Original Message -----
>From: "Thomas E. Eichhorst" <[log in to unmask]>
>To: <[log in to unmask]>
>Sent: Wednesday, August 11, 2004 7:25 PM
>Subject: Re: Freshwater barnacle
>
>
> > Kurt,
> >
> > I do not know.  The two species are obviously very closely related, but I
> > have not seen a specimen of V zebra from that far north (all of my
>specimens
> > are from Brazil - some quite a distance inland).  I would be very
>interested
> > in either borrowing the specimens to look at or seeing an image, as this
> > would really change the range data I have on that species.  The only
> > Caribbean Island specimen of V usnea I have is from Jamaica and it is
> > obviously V usnea, though much lighter in color and with fewer stripes.
>If
> > anyone has representatives from other islands I would be very interested
>in
> > seeing them also.  I see no reason why V zebra couldn't be found on
>Trinidad
> > and Tobago.  It is much more a freshwater species than V usnea.  Vitta
> > sobrina on the Pacific coast of Mexico and Central America is probably a
> > remnant population of V zebra from before the Isthmus of Panama.  Both V
> > zebra and V sobrina can be found inland in streams above waterfalls - thus
> > without any salt water influence.  Interestingly, the shells often suffer
> > the further inland one finds them, except in areas of limestone
> > outcroppings.  Moving into freshwater involved the initial battle for
> > osmoregulation, but there is an ongoing battle against the higher acidity
>of
> > freshwater streams.
> >
> > Tom Eichhorst
> >
> > > ----------------------------------------------------------------------
> > > [log in to unmask] - a forum for informal discussions on molluscs
> > > To leave this list, click on the following web link:
> > > http://listserv.uga.edu/cgi-bin/wa?SUBED1=conch-l&A=1
> > > Type your email address and name in the appropriate box and
> > > click leave the list.
> > > ----------------------------------------------------------------------
>
>
>******** IF REPLYING TO THIS MESSAGE PLEASE REMOVE THE "RE:" FROM THE
>SUBJECT LINE********
>   ************** RE: IS CONSIDERED AS ONE OF THE SPAM IDENTIFIERS ON THIS
> SERVER**************
>
>----------------------------------------------------------------------
>[log in to unmask] - a forum for informal discussions on molluscs
>To leave this list, click on the following web link:
>http://listserv.uga.edu/cgi-bin/wa?SUBED1=conch-l&A=1
>Type your email address and name in the appropriate box and
>click leave the list.
>----------------------------------------------------------------------

Mr. Kurt Auffenberg
Operations Coordinator
Exhibits & Public Programs
University of Florida
Hull Road & SW 34th Street
Powell Hall, P.O. Box 112710
Gainesville, Florida 32611-2710

Telephone: 352-846-2000, ext. 253
Fax:  352-846-0253

----------------------------------------------------------------------
[log in to unmask] - a forum for informal discussions on molluscs
To leave this list, click on the following web link:
http://listserv.uga.edu/cgi-bin/wa?SUBED1=conch-l&A=1
Type your email address and name in the appropriate box and
click leave the list.
----------------------------------------------------------------------