Hey Andrew,
Erik has it correctly, only Theodoxus fluviatilis (Linnaeus, 1758) is known
to occur that far north. It is widespread throughout Europe from the British
Isles and Spain to the Caucasus and the Black Sea, and from the Baltic Sea
to Italy. It is reported from Turkey, but these findings are probably the
very similar Theodoxus heldreichi (von Martens, 1879) or Theodoxus altenai
Schutt, 1965, both from that area. As for its northern limits, it has been
found in Denmark, as well as the southern portions of Sweden and even
Finland. It is found in marine, brackish, and freshwater; and was in fact
given three separate names by Linnaeus depending upon its habitat: Nerita
fluviatilis in the rivers of Europe (Latin fluviatilis = found in rivers),
Nerita lacustris Linnaeus, 1758 in lakes (Latin lacus = tank, pool,
reservoir, or lake), and Nerita littoralis (Linnaeus, 1767) along the
seashore (Latin littoralis = of the shore). Unlike some other nerites that
exist in both salt and "fresh" water, Theodoxus fluviatilis will not survive
if moved from one extreme to the other. An amazing little snail.
Tom Eichhorst
-----Original Message-----
From: Conchologists List [mailto:[log in to unmask]]On Behalf Of
Kay Lavalier
Sent: Sunday, June 01, 2008 6:24 AM
To: [log in to unmask]
Subject: Re: [CONCH-L] Cypraea in Norway; Theodoxus in Denmark
Thanks, Tom
All of the specimens, plain yellow or banded,
have white columella and lip, so I will stick
with C. hortensis for I.D.
I have another question that is right up
your alley: what are the species candidates
for Theodoxus found in Denmark? I found
two small black nerites, oblong in profile,
with apparently a shelly white operc.,
no noticeable surface sculpture.
I will have to "de-mummify" them
to get a better look at the opercs.
I found them in Roskilde, not far
from the Vikingeskibsmuseet
(Viking Ship Museum).
I had thought that this was on a long,
shallow bay, but looking at the map now,
it was probably a brackish lake/lagoon.
Yours, Andrew Vik
> [Original Message]
> From: Thomas Eichhorst <[log in to unmask]>
> To: <[log in to unmask]>
> Date: 5/31/2008 2:35:32 PM
> Subject: Re: [CONCH-L] Cypraea in Norway
>
> Hey Andrew,
>
> Cepaea nemoralis can be found in some pretty northerly climes, and it can
be
> mistaken for C. hortensis. I think the easiest "tell" is the
light-colored
> columella of C. hortensis and the brown lip of C. nemoralis. I am sure
some
> of our land snail experts can easily help out if they can see an image of
> the shell in question.
>
> Tom Eichhorst
>
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