Saucer-like shields protect two new 'door head' ant species from Africa and their nests

Shaped like saucers, or concave shields, and covered with camouflaging layers of debris, the heads of two "door head" ant species are found to differentiate them as new taxa. They use their peculiar features to block the entrances of their nests against intruders like other predatory ants and invertebrates.

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