An epsilonretrovirus is a genus of the retroviridae family. It infects fish. The species include the Walleye dermal sarcoma virus, and Walleye epidermal hyperplasia virus 1 and 2. See genus (mathematics) for the use of the term in mathematics. ... Genera Alpharetrovirus Betaretrovirus Gammaretrovirus Deltaretrovirus Epsilonretrovirus Lentivirus Spumavirus A retrovirus is a virus which has a genome consisting of two identical plus sense RNA molecules. ... Scientific classification or biological classification refers to how biologists group and categorize extinct and living species of organisms. ... Atlantic herring, Clupea harengus, the most abundant fish species in the world. ... In biology, a species is, loosely speaking, a group of related organisms that share a more or less distinctive form and are capable of interbreeding. ... Binomial name Sander vitreus (Mitchill, 1818) This article is about the fish; for the terms related to the eye, see Iris (anatomy) and Strabismus. ... This article needs to be cleaned up to conform to a higher standard of quality. ... A sarcoma is a cancer of the bone, cartilage, fat, muscle, blood vessels, or other connective or supportive tissue. ... Three types of viruses: a bacterial virus, otherwise called a bacteriophage (left center); an animal virus (top right); and a retrovirus (bottom right). ... Epidermis could refer to: In plants, the outermost layer of cells covering the leaves and young parts of a plant is the epidermis. ... Hyperplasia (or hypergenesis) is a general term for an abnormal increase in the amount of the cells of an organ or tissue causing it to increase in size. ...