This article has been reviewed according to Science X's editorial process and policies. Editors have highlighted the following attributes while ensuring the content's credibility: Insects rely on a wide range of strategies to sense their surroundings and communicate with their peers. Fireflies (Lampyridae) and some related beetles are known for their ability to produce visible light through chemical reactions that take place in specialized light-producing organs.
Many firefly species use these bioluminescent signals to communicate with potential mates, while some also use them to defend themselves from predators. In addition, fireflies and other beetles have sensory structures attached to their heads, known as antennae, that allow them to detect chemical cues, such as pheromones. Researchers at the Chinese Academy of Sciences, Palacký University and the University of Mandalay recently discovered a previously unknown species of lampyroid beetle preserved in an amber fossil dating to around 100 million years ago.
This ancient firefly relative, described in a paper published in Proceedings of the Royal Society B: Biological Sciences, was found to possess sophisticated antennae with an unusual architecture never observed in beetles before. "The study was initially motivated by the specimen itself. It is an exceptionally unusual lampyroid beetle with a combination of characters that has not been documented before," Yan-Da Li, first author of the paper, told Phys.org.
"Our primary objective was to describe and interpret this morphology, establish its systematic position, and place it in the broader context of lampyroid diversity during the Cretaceous. The implications for sensory ecology and signaling emerged from the morphology, but we would view those as interpretations built upon the anatomical evidence rather than the original goal of the study." Li and his colleagues examined a beetle fossil preserved in a piece of Kachin amber found in Myanmar (Burma) and dating to the mid-Cretaceous. This period ranged from about 120 to 90 million years ago and was characterized by extremely warm temperatures and much higher sea levels than those observed today.
One feature that varies among fireflies and other lampyroid beetles is their degree of body sclerotization, which refers to how hardened and rigid their exoskeletons become. Strongly sclerotized beetles, such as Sinopyrophoridae, have relatively hard and rigid body structures. Weakly sclerotized species, including many fireflies and glowworm beetles (e.g., Phengodidae and Rhagophthalmidae), have much more flexible bodies.
The researchers compared the fossil's anatomical features with those of known bioluminescent beetles. They found that its sclerotization fell somewhere in the middle, as it was neither particularly strong nor weak. "The Cretaceous genus Cretophengodes (Cretophengodidae) from Kachin amber shows an intermediate condition, with a less strongly sclerotized body but relatively well-developed prosternal process and mesoventral cavity and abdominal ventrites arranged in a comparatively compact form," explained Li.
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