>the fields in the database are : family, genus, species + subspecies, author, country, province, locality, coordinates, height, habitat, day, month, year, leg, det, excoll, note
>but you can make more fields
>what do you think of my system. Please let me know. The systematic work will be terminated very soon and if there are collectors interested in such a system I can send them the list to see the numbers<

It sounds like a good system.  In general, it is better to include as many fields as possible, becuase leaving a field blank is easier than adding fields.  Also, allow plenty of room in each.  Thus, you want to be sure that you allow for as many species as you are ever likely have in one genus, etc.

    Dr. David Campbell
    Old Seashells
    46860 Hilton Dr #1113
    Lexington Park MD 20653 USA
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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 Droigate Spa