epsilonretrovirus epsilonretrovirus epsilonretrovirus is a waterborn genus of the retroviridae family. it infects fish. the species include walleye dermal sarcoma virus, and walleye epidermal hyperplasia virus 1 and 2. epsilonretrovirus virus classification (unranked): virus realm: riboviria kingdom: pararnavirae phylum: artverviricota class: revtraviricetes order: ortervirales family: retroviridae subfamily: orthoretrovirinae genus: epsilonretrovirus species walleye dermal sarcoma virus walleye epidermal hyperplasia virus 1 walleye epidermal hyperplasia virus 2