Wild sheep
Taxonomy in the genus
Ovis is among the most complicated of any bovid and between one and seven species have traditionally been recognized. In recent years Snow sheep (
Ovis nivicola), Dall sheep (
Ovis dalli) and Bighorn sheep (
Ovis canadensis) have normally been treated as distinct species. The mess starts with when it comes to the sheep ranging from Europe to Central Asia. There has been a lot of confusion on the number of species recognized here, which has been made extra confusing by a large number of seemingly hybrid populations. Traditionally are the Argali (
Ovis ammon), Urial (
Ovis vignei) and the Asiatic mouflon (
Ovis gmelinii) and the European mouflon (
Ovis orientalis), where the last three have often been considered conspecific. Another problem is that
orientalis has probably been described based on a hybrid. The Mouflon from Europe (
musimon) are however descended of early-domesticated sheep returned to a wild life (e.g. Hiendleder et al. 2002), as are likely Cypriotic mouflon (
ophion) (Sanna et al. 2016). These two taxa are not considered any further.
G&G recognize the following species within these species groups:
Ovis gmelini group (
Ovis orientalis) = Mouflon
O. gmelini Turkey, Armenia, SW Azerbaijan, NE Iraq, NW Iran
O. isphaganica WC Iran, mountains around Esfahan city
O. laristanica Laristan and Fars province, Iran
Ovis vignei group = Urial
O. vignei, Ladakh, Kashmir in Pakistan and India and Wakhan and Ishkashim in Tajikistan
O. punjabiensis, Punjab province, Pakistan
O. bochariensis, NE Turkmenistan, S Uzbekistan, N Afghanistan, S Tajikistan
O. arabica, Oman and SE Saudi Arabia
O. cycloceros (including
arkal) S Turkmenistan, NE Iran, Afghanistan
O. severtzovi Uzbekistan and the Turkestan range in Kyrgyzstan and Tajikistan
Ovis ammon group = Argali
O. nigrimontana Darya Karatau mountains, Kazakhstan
O. karelini, Tian-Shan mountains in SE Kazakhstan and E Kyrgyzstan, E to Urumqi in W China
O. collium Kazakhstan and NW China
O. polli E part of the Wakhan corridor, Afghanistan, Pamir plateau, Tajikistan, Pamir region and SE Kyrgyzstan into W China
O. hodgsoni, N India, N Nepal, N Bhutan, Tibet, NW Sichuan and SW Gansu and S Qinghai, China
O. ammon Altai mountains, W Mongolia, N Xinjang China, NE Kazakstan and Gorno-Alta and Tuvai republics in Siberian Russia
O. darwini S Mongolia, N China
O. jubata NE China
Sample sizes
Sample sizes for skins are not given
Skulls/horns (males only)
gmelini 3-7
isphaganica 1-8
laristanica 1-2
cycloceros 18-36
bochariensis 6-10
vignei 4-10
punjabiensis 1-6
arabica 0-1
severtzovi 0-5
nigrimontana 0-6
karelini 9-19
polli 8-31
collium 0-7
ammon 0-19
darwini 0-3
hodgsoni 2-16
The many 0 are due to the fact that the frontal arc was not measured in many specimens.
Data for
jubata are taken from (Geist 1991) and are thus not shown in the main table.
Additionally there are samples from several hybrid populations (
gmelini X
arkal and
cycloceros X
laristanica)
Skins
The main difference between the
vignei and
gmelini group is that the
gmelini group has a white saddle patch, which is absent in
vignei. There are several minor pelage differences withing the
gmelini group. The main difference between the
vignei and
ammon group is that the
vignei group has a clear mane, absent in the
ammon group.
Horns & skulls
vignei group
Both
isphaganica and
laristanica are said to have shorter teeth and thinner horns than
gmelini, but there is wide overlap in teeth measurements and there is only 1 horn measurement for
isphaganica and 2 for
laristanica, so no reliable conclusion can be drawn
gmelini group
punjabiensis and
bochariensis are very similar in skull characteristics and have on average a larger frontal arc than
cycloceros, but there is overlap between
bochariensis an
cycloceros. The single
arabica skull seems to have shorter teeth than all other taxa, the skull in general fits this group, though in terms of distribution a placement in the
vignei group is more likely. in Skull heigth and skull breadth
severtzovi seems somewhat intermediate between the
gmelini and
ammon group.
ammon group
ammon and
hodgsoni are on average the largest taxa and this difference is absolute compared to some other taxa, though there are several intermediate taxa as well
nigrimontana,
darwini and
collium are the smaller taxa.
darwini is described as having a shorter, narrower but somewhat higher skull compared to
hodgsoni and
ammon, there is however large overlap in these measurements and sample sizes to small for reliable multivariate analyses. Overall a larger number of more subjective skull and horn measures are described, but given the data provided in the table combined with small sample sizes it is hard to draw generalizations from them.
Additional data
There has been quite some research on the genetics of wild sheep, especially because they are the forefathers of domestic sheep. There are clear differences genetically between the three groups.
gmelini has a karyotype of 2n=54,
vignei one of 2n=58 and
ammon one of 2n=56. Research by Rezaei et al. (2010) indicate that
ammon likely diverged from
gmelini +
vignei +- 1.72 million years ago (+-0.36 mya) and
gmelini and
vignei likely split 1.26 million years ago (+-0.36 mya). The relationships are however made more complex by extensive hybridization at the borders of these groups.
severtzovi clearly groups in the
ammon group. Several taxa
: isphanicia, arkal, punjabiensis and
gmelini are found not to be monophyletic based on genetic data.
Summarizing
Using a combination of morphological and genetic research it seems best to recognize three species of wild sheep in Eurasia next to the Snow sheep:
Ovis gmelini (=
Ovis orientalis) ,
Ovis vignei and
Ovis ammon. Within each species there is quite some variation and all taxa elevated to species status by G&G can at least for now be recognized as subspecies, genetic research is however necessary to understand further the exact phylogenetic relationships within each group. Additionally the status of wild sheep on the Arabian peninsula is of conservation concern, as it is unclear whether they belong to
vignei or
gmelini.
Mouflon
Ovis gmelini gmelini
@Tomek , Tallinn Zoo, Estonia
Urial
Ovis vignei vignei
@Chlidonias , Hemis NP, India
Ovis vignei cycloceros (
arkal)
@Nick@Amsterdam, Tierpark Berlin, Germany
Ovis vignei punjabiensis
@J I N X , Peshawar Zoo, Pakistan
Ovis vignei bochariensis
@Tomek , Zoo Liberec, Czechia
Argali
Ovis ammon ammon
@Giant Eland , Novosibirsk Zoo, Russia
Ovis ammon collium
@alexkant , Karaganda Zoo, Kazakhstan
Ovis ammon hodgsoni (including
dalailamae)
@Deer Forest , Beijing Zoo
Ovis ammon jubata
@bongowwf , Shanghai Zoo, China
Ovis ammon polli
@Dormitator , Moscow Zoo breeding center, Sychovo, Russia
Ovis ammon darwini
@Chlidonias , Ikh Nart Nature Reserve, Mongolia
Hybrid sheep
Hybrid
vignei X
gmelini "Alborz sheep"
@fofo , Tehran Zoo, Iran
European mouflon
Ovis varies var. ophion Cyprus mouflon
@NigeW , Pafos Zoo, Cyprus
Ovis varies var. musimon European mouflon
@Tomek , New Forest Wildlife Park, UK
No pictures of
nigrimontana, severtzovi, karelini, arabica, isphaganica or
laristanica have been uploaded to the gallery yet
References
Hiendleder et al. (2002):
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1690972/pdf/12028771.pdf
Rezaei et al. (2010):
https://www.sciencedirect.com/science/article/pii/S1055790309004461?via=ihubhttps://www.sciencedirect.com/science/article/pii/S1055790309004461?via=ihub
Sanna et al. (2016):
The First Mitogenome of the Cyprus Mouflon (Ovis gmelini ophion): New Insights into the Phylogeny of the Genus Ovis
Next: the remaining Caprini