For what it's worth...
Xenophora conchyliophora is apparently affected by "red tide". I dove off
Bradenton once just after a red tide outbreak and found a line of about 9
recently dead and upside-down Xenophora.
Most other mollusks seem unaffected, but Cypraea cervus dies right away.
Peggy Williams
Shell Collecting Trips Around the World
Visit my website at http://www.mindspring.com/~shellelegant
Peggy Williams
Shell Elegant
PO Box 575 * Tallevast FL 34270
(941) 355-2291 * [log in to unmask]