Beetle Head (IMAGE) Penn State Caption This is a cross-section of the paired mandibular mycangia in the head of the ambrosia beetle, Euwallacea validus, which house the symbiotic fungus the beetle farms. Credit Matthew Kasson, Penn State Usage Restrictions non commercial use only License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.