>  Thank you, Henk. I've heard that teredinid bivalves and balanid barnacles
>  have been moved around by wooden ships so much in the past five centuries
>  that in a few cases even the experts must guess where a species  originated.
>  Is this so?

Yes; Ruth Turner stated that this is the case for some teredinids.

    Dr. David Campbell
    Old Seashells
    University of Alabama
    Biodiversity & Systematics
    Dept. Biological Sciences
    Box 870345
    Tuscaloosa, AL  35487-0345 USA
    [log in to unmask]

That is Uncle Joe, taken in the masonic regalia of a Grand Exalted Periwinkle of the Mystic Order of Whelks-P.G. Wodehouse, Romance at Droitgate Spa

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