Front of head semicircular in outline. No other hammerhead has front of head in semicircle. (Ref. 26938).
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Smith, C.L. 1997 National Audubon Society field guide to tropical marine fishes of the Caribbean, the Gulf of Mexico, Florida, the Bahamas, and Bermuda. Alfred A. Knopf, Inc., New York. 720 p. (Ref. 26938)
http://www.fishbase.org/references/FBRefSummary.php?id=26938&speccode=4257
