Marine Biodiversity Records is a rapid peer-reviewed, online, open access publication that complements the long-established Journal of the Marine Biological Association of the United Kingdom. Marine Biodiversity Records has been launched in response to the changing marine and coastal environment and an increasing demand for the documentation of marine organisms in locations where they have not formerly been recorded, as well as of species loss from habitats. Marine Biodiversity Records therefore welcomes original research articles which document and review changes in geographical ranges of marine species, including the effects of the introduction of novel or alien species to marine ecosystems, and of taxonomic studies relevant to these changes.