Chrysopoid larvae from Mid-Cretaceous Burmese amber (Image by WANG Bo) and the reconstruction of naked chrysopoid larva (image by YANG Dinghua)
Insects have evolved various types of camouflage that has played an important role in their evolutionary success. Debris-carrying, a behavior of actively harvesting and carrying exogenous materials, is among the most fascinating and complex behaviors because it requires not only an ability to recognize, collect, and carry materials, but also evolutionary adaptations in related morphological characteristics.
Dr. WANG Bo from NIGPAS and his colleagues have now reported a diverse insect assemblage of exceptionally preserved debris carriers from Cretaceous Burmese, French, and Lebanese ambers, including the earliest known chrysopoid larvae (green lacewings), myrmeleontoid larvae (split-footed lacewings and owlflies), and reduviids (assassin bugs). The study has been published on Science Advances on June 24, 2016.
These ancient insects used a variety of debris material, including insect exoskeletons, sand grains, soil dust, leaf trichomes of gleicheniacean ferns, wood fibres, and other vegetal debris. They convergently evolved their debris-carrying behavior through multiple pathways, which expressed a high degree of evolutionary plasticity.
These fossils are the oldest-known direct evidence of camouflage behavior utilizing trash in the fossil record and show unequivocal evidence of camouflage in immature lacewings and reduviids dating back more than 100 million years. They demonstrate that the behavioral repertoire, which is associated with considerable morphological adaptations, was already widespread among insects by at least the Mid-Cretaceous. These discoveries provide a novel insight into early evolution of camouflage in insects and ancient ecological associations among plants and insects.
Most Burmese amber lacewing larvae are preserved with dendritic trichomes produced by gleicheniacean ferns, and two chrysopoid larvae are carrying these trichomes, suggesting that these fossil lacewing larvae are closely associated with the habitats of gleicheniacean ferns.
Gleicheniaceae are important components of many Mid-Cretaceous floras worldwide, and are thought to be among the earliest colonizers after fire events. Therefore, the frequent occurrence of gleicheniacean trichomes in the Burmese amber is indicative of fire events during the time when the amber was deposited. This supports a relationship between fire events and the high production of plant resins and also highlights the importance of wildfires in Mid-Cretaceous pre-angiospermous ecosystems.