Moss bugs shed light on the evolution of complex bioacoustic systems

Abstract

Vibroacoustic signalling is one of the dominant strategies of animal communication, especially in small invertebrates. Among insects, the order Hemiptera displays a staggering diversity of vibroacoustic organs and is renowned for possessing biomechanically complex elastic recoil devices such as tymbals and snapping organs that enable robust vibrational communication. However, our understanding of the evolution of hemipteran elastic recoil devices is hindered by the absence of relevant data in the phylogenetically important group known as moss bugs (Coleorrhyncha), which produce substrate-borne vibrations through an unknown mechanism. In the present work, we reveal the functional morphology of the moss bug vibrational mechanism and study its presence across Coleorrhyncha and in extinct fossilised relatives. We incorporate the anatomical features of the moss bug vibrational mechanism in a phylogeny of Hemiptera, which supports either a sister-group relationship to Heteroptera, or a sister-group relationship with the Auchenorrhyncha. Regardless of topology, we propose that simple abdominal vibration was present at the root of Euhemiptera, and arose 350 million years ago, suggesting that this mode of signalling is among the most ancient in the animal kingdom. Therefore, the most parsimonious explanation for the origins of complex elastic recoil devices is that they represent secondary developments that arose exclusively in the Auchenorrhyncha.

Phylogenomics resolves the relationship and the evolutionary history of planthoppers (Insecta: Hemiptera: Fulgoromorpha)

“…Two important studies addressing phylogenetic questions at higher taxonomic levels (e.g., order and suborder) have confirmed the status of crown Fulgoromorpha (Delphacoidea and Fulgoroidea) as a monophyletic clade that is sister to crown Cicadomorpha: Clypeata (cicadas, spittlebugs, and leafhoppers/treehoppers), with the two clades often grouped into a suborder Auchenorrhyncha Davranoglou and Hartung, 2024;Szwedo, 2017). On the other hand, they provided limited information on the relationships among planthopper clades.…”