Hi all, Ric Jordan solved the mystery! They are testate amoebaes. Here's the link for any who are interested http://www.arcella.nl/lamptoquadrula-spec Thanks for the help! Jean Jean M. Self-Trail U.S. Geological Survey 926A National Center Reston, VA 20176 703-648-6013 There is no sin but ignorance *Marlowe* -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://webmail.fcnym.unlp.edu.ar/pipermail/coccoliths/attachments/20151110/4e56a268/attachment.html>