Dictionary of Ichthyology  

ichthyocentaur = a sea creature with the forefeet of a horse, a human body and a fish tail, and sometimes with a pair of lobster-claw horns. Usually shown blowing on a conch shell to raise or calm a storm.

Buner reliefs, Peshawar, Pakistan. Wikimedia Commons: http://en.wikipedia.org/wiki/File:Ichthyo-Centaur.jpg

Canadian Museum of Nature