>If you go to this URL:
>http://www.geology.gla.ac.uk/palaeo/nmita/database/bivalves/systemat/bivalgen.htm
>you get a list of "Neogene" bivalve genera of tropical America, and on that list, in alphabetical order, is the genus Acropsis!  Farther down the list is Arcopsis.  BUT - and here's the strange part - at first I thought I was seeing things . . . scroll to the bottom of the page, click on bivalves, then click on Taxa (Genera)
The same list reappears, only now Acropsis has been changed to Arcopsis. It still occupies the same place in the alphabetical list (now out of order), and Arcopsis still appears farther down the list, where it was before.  Odd, no??
Paul M.
<<<

I think the answer to this one is that the NMITA home page identifies this part as under construction.  The Taxa (Genera) page list corrects another typo in addition to Acropsis (Tiachycardium to Trachycardium) and removes three muricids from the bivalve list at the first address.  The first address also has links to photos for two genera.  In one case, the internal view of a valve is listed as external.  Obviously still being edited!

There is an ostracode genus Acocypris, in the Cypridacea (now Cypridoidea).  As a fresh-water genus, I think it is rather unlikely for Aldabra, in addition to requiring greater problems with typing than Arcopsis.  It is a bi-valved non-mollusk.

Dr. David Campbell
    "Old Seashells"

    NEW ADDRESS AS OF 8/21/00
    Biology Department
    Saint Mary's College of Maryland
    18952 E. Fisher Road
    St. Mary's City, MD  20686-3001 USA
    [log in to unmask], 301 862-0372 Fax: 301 862-0996

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