on the subject of truly  amphiatlantic species of course in the NE US
there are many others that just didnt appear on the checklist because
we didnt see them.

for example on easternmost long island in rocky areas we can have
Lacuna vincta, Nucella lapillus and in slightly deeper water Buccinum
undatum.....

On 12/11/12, Harry Lee <[log in to unmask]> wrote:
> That's quite consistent with my thinking (see below), Erick.
>
> Z. nitidus (Muller, 1774) <
> http://www.biodiversitylibrary.org/item/46380#page/72/mode/1up>
> is an urban snail on our side of the pond, so
> recent introduction is one of the "usual
> suspects." Based on its entire geographic range,
> Pilsbry (1946: 478) surmised that it is a
> "Pleistocene immigrant in America." Presumably that rules out human agency.
>
> Pilsbry, H.A., 1946. Land Mollusca of North
> America north of Mexico vol. II part 1. Academy
> of Natural Sciences, Philadelphia. vi + 1-520. Dec. 6.
> < http://babel.hathitrust.org/cgi/pt?id=uc1.31822000620252#page/478/mode/1up
>>
>
> Sincerely,
> Harry
>
>
> At 12:46 AM 12/11/2012, you wrote:
>>Given that Z.nitidus has been described by Müller in 1774 from material
>>collected at a quite specific location: Denmark: Fridrichsberg near
>>Kopenhagen (source:
>>http://www.animalbase.uni-goettingen.de/zooweb/servlet/AnimalBase/home/speciestaxon?id=6483
>>
>>
>>).
>>Fridrichsberg (at the moment called Frederiksberg) is anno 2012 a
>>western suburb of Copenhagen, but inland. Even if the species would have
>>been introduced from the New World by shipping into Europe, it would
>>have established itself over a very large part of Europe, even to Greece
>>and deep into Russia, in the 350 year period from the discovery of the
>>New World by Europeans until the start of consistent faunistic  studies
>>of terrestrial mollusca in Europe.
>>For a terrestrial snail, that is highly unlikely. Therefore Z.arboreus =
>>Nearctic, Z.nitidus = Holarctic with possible introductions by man into
>>the New World.
>>
>>Sincerely, Erick
>>
>>On 12/11/2012 03:39 AM, Harry Lee wrote:
>>>/Zonitoides arboreus/ is certainly a New World species. /Z. nitidus/
>>>needs further scrutiny in that regard.
>>>
>>>Harry
>
> At 07:59 PM 12/10/2012, you wrote:
>>..........possibly the Zonitoides could be an
>>introduction from the old world into
>>the new world, since Zonitoides is a quite common genus over here.
>

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