Dictionary of Ichthyology  

prehensile = capable of grasping, e.g. the tail of a seahorse, Hippocampus.

Hippocampus abdominalis, New Zealand, Porto Bello, Otago Peninsula, South Island, CMNFI 2000-0047, 87 mm from top of head to tail curl. Photograph by Brian W. Coad.

Canadian Museum of Nature
www.briancoad.com