Myxococcus llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogochensis

Myxococcus - is a gram-negative, rod-shaped species of myxobacteria found in soil. It is a predator on other bacteria.

The ends of the rod-shaped vegetative cells taper slightly. The colonies are usually pale brown and show swarming motility. It produces orange, roughly spherical fruiting bodies. A draft sequence of its genome showed significant differences from all previously known species of the genus Myxococcus.

The species was isolated from soil collected near the village of Llanfairpwllgwyngyll, on the island of Anglesey in North Wales, and its specific name was given after the settlement's 58-character lengthened name (-), which is the longest in Europe.

The scientific name of this bacterial species is considered the longest name in the binomial nomenclature system, bearing 73 letters in total.

The species name has been criticized for not following recommendations in the International Code of Nomenclature of Prokaryotes, that specifies that long and difficult to pronounce names should be avoided. Since the International Journal of Systematic and Evolutionary Microbiology plays an important role in nomenclature validation, some critics have argued that the species name can not be considered valid before being published in that Journal. With its publication in a list in 2021, the name was confirmed as valid.