I was wondering what the upper size limit or even WRS might be for Nucella
lapillus...most of my books list 2 inches and the largest I have seen
offered for sale were in the 50-55mm ballpark  from a "now extinct"
population somewhere in the Netherlands I think it was ...it sounded like
the habitat was lost due to factors other than collecting (?) ...does
anybody know of large specimens or localities that have produced large
specimens, either here in the US or in Europe (including the one in the
Netherlands?).

The largest specimen I have seen in the US was just under 50mm, at Acadia
National Park, on the "left" side of the Bar at Bar Harbor....fresh dead,
49.8mm. Quite elongate

Steve

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