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The surgeonfishgenus is named "Acanthurus", which means "thorn-tail", because species in this genus bear dangerously sharp spines on either side of the tail. In this picture the light mark alongside the dark stem of the tail shows where the spine is kept folded away like the blade of a penknife
This photograph shows the exposed spine of the surgeonfish species Acanthurus xanthopterus
Acanthacris ruficornis bears thorn-like spines on the tibiae of the hind legs