Photo & copyright by: Anne DuPont, Delray Beach, Florida, USA

Gastropteron chacmol  Gosliner, 1989
Thanks for identification to Bill Rudman's Sea Slug Forum

Photo details:
size: 4 mm
depth: 2 m
date: 5 January 2004
country: Bahamas
location: Exuma
dive site: Stocking Island
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Gastropteron chacmol
  taxonomy of
Gastropteron chacmol