D. ROBERTS / SCIENCE PHOTO LIBRARY D. ROBERTS / SCIENCE PHOTO LIBRARY
Seahorses. Coloured X-ray of two seahorses, Hippocampus sp., positioned back to back. A seahorse is a type of fish. The external bony skeleton consists of rings around the head, trunk, and tail and some of these bony plates have spines. The gill cavity is behind each eye. Seahorses move slowly using fins (not seen here); their tail can be used to anchor the animal to seaweed or coral. It is the male seahorse that incubates the fertilized eggs in a brood pouch on his abdomen. There are many species of Hippocampus distributed around the world, mainly in tropical and subtropical seas.
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