A Cretaceous bug with exaggerated antennae might be a double-edged sword in evolution

Sexual selection can favor production of exaggerated features, but the high cost of such features in terms of energy consumption and enemy avoidance makes them go to extinction under the influence of natural selection. However, fossils preserved with specialized features are very rare. Here, we report a new nymph from Burmese amber, Magnusantena wuae Du & Chen gen. et sp. nov., which has exaggerated leaf-like expanded antennae. Such bizarre antennae indicate that sensitive and delicate sensory system and magnificent appearance in Hemiptera have been already established in mid-Cretaceous. Our findings may provide evidence for Darwin's view that sensory organs play an important role in sexual selection. This nymph with the leaf-like antennae may also represents a new camouflage pattern. However, the oversized antennae are costly to develop and maintain, increasing the risks from predators. Such unparalleled expanded antennae might be the key factor for the evolutionary fate of the coreid.

Automated summary

The discovery of a new nymph with exaggerated leaf-like antennae from the mid-Cretaceous suggests the presence of a sensitive sensory system and magnificent appearance in Hemiptera insects. These exaggerated antennae may play a role in sexual selection and could represent a new camouflage pattern. However, the oversized antennae also come with increased risks from predators.