Alex,
Without any additional information or shell description, I am
going to venture a guess and say that it is possibly
Cipangopaludina chinensis malleatus (Reeve, 1863), in the
Family Vivipariidae. I base this on my personal collecting
experiences in Central Park when I still lived in NYC numerous
years ago.  Is the shell globose, with a slightly malleated,
greenish colored body whorl?
Rich
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www.worldwideconchology.com
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---- Original message ----
>Date: Sun, 9 Oct 2005 00:02:12 +0200
>From: Alex Menez <[log in to unmask]>
>Subject: Large freshwater snails lurking in Central Park Lakes
>To: [log in to unmask]
>
>Hello everyone
>
>Just got back from a great week in New York. Does anyone know
the ID of the
>large, black, operculated freshwater snails that lurk in the
lakes of
>Central Park?
>
>Regards
>
>Alex Menez
>
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