>Neotaenioglossa as an order, removing a great number of families from Neogastropoda.  Can someone
>  tell me if this is a new or old Order subdidision and which families this  subdivision affects?

The ICZN only regulates names up to superfamily level, so you can do whatever you want with orders.
According to Ponder and Waren, 1988 (Malacol. Rev. Supp. 4, p. 288-326),  Neotaenioglossa was proposed by Haller in 1882.  It's basically equivalent to Mesogastropoda without the architaenioglossans (ampullaroideans, cyclophoroideans).  Both Neotaenioglossa and Mesogastropoda are grades rather than clades and so may be rejected or substantially modified (e.g., by including the entire Neogastropoda) by the cladistically inclined taxonomists.

    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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