Rediscovery and reconsideration of the bizarre Cretaceous ant Haidomyrmex

A new specimen of the bizarre ant Haidomyrmex was discovered in a Myanmar amber deposit dating 100 million years ago. The dealate specimen exhibits enormous tusk-like mandibles not seen in any other ant species, extinct or modern. Here, the specimen is described through traditional methods, as well as using X-ray computed tomography – allowing for a detailed 3D reconstruction of gross internal and external morphology. In addition, it’s placement in the family Formicidae is discussed with reference towards the importance of fossil taxa in modern phylogenies.