Evolution of symbioses within Bostrichidae beetles

Symbioses between insects and bacteria are widespread in nature. Bacteroidetes bacteria are described to engage in associations with various insects. Most prominent are the symbioses between Auchenorrhyncha and the main symbiont Sulcia muelleri, which provides especially essential amino acids for the host, and cockroaches, in which the  Blattabacterium spp. play an important role in nitrogen recycling. Also, several pest beetles established a symbiosis with Bacteroidetes bacteria. In the Silvanidae (Coleoptera), these symbionts prove to be extremely useful as they allow them to better adapt to dry conditions by supporting their cuticle synthesis. Here we sequenced the genomes of the symbionts of several Bostrichid beetles by combining Illumina short read and Oxford Nanopore long read technology to reconstruct the whole genomes and, analyze the metabolic basis of these symbioses and their evolutionary history.