|Fossil tooth of Rhizodus hibberti|
The most notable characteristics of Rhizodus, compared to other giant lobe-fins such as Barameda, were the two 22 centimetres (8.7 in) fangs located near the front of its jaws, followed by other teeth scaling downwards in size. Rhizodus was a giant apex predator that resided in freshwater lakes, river systems and large swamps in the entire Carboniferous period, feeding on small to medium-sized amphibians, using its teeth to kill prey and rip it into digestible sizes, rather than swallowing prey whole like other, smaller-toothed sarcopterygians.
Rhizodus' diet includes medium sized fish and tetrapods. It has been proposed that Rhizodus may have lunged at terrestrial, shorebound prey, just like a modern day crocodile.
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