Check out our newest paper on genome degeneration in the luminous bacterial symbionts of deep-sea anglerfishes! Extracellular, possibly environmentally acquired, symbionts with small genomes and the highest rate of transposon proliferation we've found in the literature! Plus, they're crazy weird.
http://mbio.asm.org/content/9/3/e01033-18.full
Photo credit: Danté Fenolio
http://mbio.asm.org/content/9/3/e01033-18.full
Photo credit: Danté Fenolio