alphaguttavirus alphaguttavirus alphaguttavirus is a genus of viruses, in the family guttaviridae. sulfolobus newzealandicus serve as natural hosts. there is only one species in this genus: sulfolobus newzealandicus droplet-shaped virus. alphaguttavirus virus classification (unranked): virus realm: incertae sedis kingdom: incertae sedis phylum: incertae sedis class: incertae sedis order: incertae sedis family: guttaviridae genus: alphaguttavirus structure viruses in the genus alphaguttavirus are enveloped. the diameter is around 70-95 nm, with a length of 110-185 nm. genomes are circular, around 20kb in length. life cycle dna-templated transcription is the method of transcription. sulfolobus newzealandicus serve as the natural host.