Thorny Seahorse  Hippocampus histrix picture

Photo copyright Graham Collins and SCUBA Travel.
Taken on Malapascua, Cebu Island in the Philippines.
Thorny Seahorse (Hippocampus histrix)

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Further Reading
A diver's guide to Underwater Malaysia, Andrea and Antonella Ferrari, 2003
Seahorses, Pipefishes and Their Relatives: A Comprehensive Guide to Syngnathiformes, Rudie H. Kuiter, 2003
The Underwater Photographer: Digital and Traditional Techniques, by by Martin Edge, Paperback, 536 pages (2009)