The narwhal is a species of toothed whale native to the Arctic. It is the only member of the genus Monodon and one of two living representatives of the family Monodontidae. The narwhal has a similar build to the closely related beluga whale, with which it overlaps in range and can interbreed. It is a stocky cetacean with a relatively blunt snout, a large melon, and a shallow ridge in place of a dorsal fin. Males of this species have a large 1.5–3.0 m long tusk, which is a left protruded canine thought to serve as a weapon or as a tool for feeding, attracting mates or sensing water salinity. Specially adapted slow-twitch muscles, along with the jointed neck vertebrae and shallow dorsal ridge allow for easy movement through the Arctic environment, where the narwhal spends extended periods at great depths.
Mardivirus is a genus of viruses in the order Herpesvirales, in the family Herpesviridae, in the subfamily Alphaherpesvirinae. Chickens, turkeys, and quail serve as natural hosts. There are six species in this genus. Diseases associated with this genus include: Marek's disease, which causes asymmetric paralysis of one or more limbs, neurological symptoms, and development of multiple lymphomas that manifest as solid tumors. Gallid herpesvirus 2 is the only one of these viruses known to be pathogenic and due to the antigenic similarity between the three viruses the other two have been used to vaccinate against Marek's disease. These viruses have double stranded DNA genomes with no RNA intermediate.
Macropodid alphaherpesvirus 2 (MaHV-2) is a species of herpesvirus in the genus Simplexvirus. It was officially accepted as a valid species by the International Committee on Taxonomy of Viruses in 2004.
Columbid alphaherpesvirus 1 (CoHV-1) is a species of virus in the genus Mardivirus, subfamily Alphaherpesvirinae, family Herpesviridae, and order Herpesvirales. It is also known as pigeon herpesvirus, as it afflicts pigeons.
Gallid alphaherpesvirus 3 (GaHV-3) is a species of virus in the genus Mardivirus, subfamily Alphaherpesvirinae, family Herpesviridae, and order Herpesvirales.
Meleagrid alphaherpesvirus 1 (MeHV-1) is a species of virus in the genus Mardivirus, subfamily Alphaherpesvirinae, family Herpesviridae, and order Herpesvirales.
Spheniscid alphaherpesvirus 1 (SpAHV-1) is a species of virus in the genus Mardivirus, subfamily Alphaherpesvirinae, family Herpesviridae, and order Herpesvirales.
Cercopithecine alphaherpesvirus 2 (CeHV-2) is a species of virus in the genus Simplexvirus, subfamily Alphaherpesvirinae, family Herpesviridae, and order Herpesvirales.
Human alphaherpesvirus 1 or Herpes simplex virus 1 is a species of virus in the genus Simplexvirus, subfamily Alphaherpesvirinae, family Herpesviridae, and order Herpesvirales.
Leporid alphaherpesvirus 4 (LeHV-4) is a species of virus in the genus Simplexvirus, subfamily Alphaherpesvirinae, family Herpesviridae, and order Herpesvirales.
Panine alphaherpesvirus 3 (PnHV-3) is a species of virus in the genus Simplexvirus, subfamily Alphaherpesvirinae, family Herpesviridae, and order Herpesvirales.
Pteropodid alphaherpesvirus 1 (PtHV-1) is a species of virus in the family Herpesviridae.
Saimiriine alphaherpesvirus 1 (SaHV-1) is a species of virus in the genus Simplexvirus, subfamily Alphaherpesvirinae, family Herpesviridae, and order Herpesvirales.
Bubaline alphaherpesvirus 1 (BuHV-1) is a species of virus in the genus Varicellovirus, subfamily Alphaherpesvirinae, family Herpesviridae, and order Herpesvirales.
Caprine alphaherpesvirus 1 (CpHV-1) is a species of virus known to infect goats worldwide. It has been shown to produce systemic and respiratory symptoms in kids and to cause abortions in adult goats.
Cercopithecine alphaherpesvirus 9 (CeHV-9) is a species of virus in the genus Varicellovirus, subfamily Alphaherpesvirinae, family Herpesviridae, and order Herpesvirales.
Cervid alphaherpesvirus 2 (CvHV-2) is a species of virus in the genus Varicellovirus, subfamily Alphaherpesvirinae, family Herpesviridae, and order Herpesvirales.
Equid alphaherpesvirus 8 is a species of virus in the genus Varicellovirus, subfamily Alphaherpesvirinae, family Herpesviridae, and order Herpesvirales.
Phocid alphaherpesvirus 1 (PhHV-1) is a species of virus in the genus Varicellovirus, subfamily Alphaherpesvirinae, family Herpesviridae, and order Herpesvirales.
Chelonid alphaherpesvirus 6 (ChHV-6) is a species of virus of uncertain generic placement in the subfamily Alphaherpesvirinae, family Herpesviridae, and order Herpesvirales.
