Tucker presumed extinction of T. cuvieriana based on lack of living, or
even dead collected shells for many years -- at least in dealer
circulation. When the Madagascar land shell resurgence took hold back in
the mid-1980's while Tucker was working on the manuscript and photographing
shells for Compendium of Landshells some dead collected T. cuvieriana
shells turned up. But he was not convinced that the species still survived
in the wild (pers.com.). The year after Compendium was published I brought
two very fresh-dead T. cuvieriana to the COA convention. Tucker saw the
shells and with great excitement, bought one specimen! With greater
interest showed in land shells over the next decade, there was a greater
emphasis for finding species like T. cuvieriana. And, well, the rest is
history.
Rich
Original Message:
-----------------
From: C. E. Pinkerton [log in to unmask]
Date: Fri, 18 Jun 2004 11:47:35 -0400
To: [log in to unmask]
Subject: Re: shell extinction..
Thanks for the information about specie"s" extinction. We had noted that
in the "Compendium of Landshells" Tropidophora cuvierana (Petit,1841 ) is
listed as extinct. At COA in Houston a few years back, there was a dealer
from Italy I think, who had bags of them with opercs. Apparantly their
habitat was not treetop as previously presumed but in detritus under the
trees.
We no longer have the web page but can be reached at
[log in to unmask]
Thanks again
For all your shell specimen collection needs,
visit Mique's Molluscs online at http://www.miquesmolluscs.com
-----Original Message-----
From: Andrew Grebneff <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: Friday, June 18, 2004 12:14 AM
Subject: Re: shell extinction..
Greetings all...just wondering who determines that a specie is
extinct and what criteria is used in the determination??
Pinky Pinkerton
For all your shell specimen collection needs,
visit Mique's Molluscs online at http://www.miquesmolluscs.com
That URL takes you to Domain Contender or some such name. While this
does have a molluscs button, there is no hint of your site.
The word species is both sigular and plural. There is no such thing as
a "specie" of shell.
A species becomes extinct at some time or other, either because it dies
out or because it evolves into another species (and extinctions can be
local, caused by a species "moving out" of an area, while still living
elsewhere). Quite a few species described as fossil have subsequently been
discovered to be still living (eg Aeneator elegans, Babylonia lani).
Anyone with sufficient knowledge of the relevant genus can decide
whether or not a fossil specimen belongs to a species which is now extinct,
but he MAY eventually be proven wrong. The danger is that, though he knows
his local fossil & Recent faunas, he may not know those of other areas
well, and his "extinct" beastie might still be living elsewhere. As is
usual with nature, it's not a neat & simple thing.
--
Andrew Grebneff
Dunedin, New Zealand
64 (3) 453-4436
<[log in to unmask]>
Fossil preparator
Seashell, Macintosh & VW/Toyota van nut
________________________________
I want your sinistral gastropods!
________________________________
Opinions in this e-mail are my own, not those of my institution
_______________________________________________
A: Because it reverses the logical flow of conversation.
Q: Why is top posting frowned upon?
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