Recent molecular systematic studies of arvicoline voles of the genera
Neodon
,
Lasiopodomys
,
Phaiomys
, and
Microtus
from Central Asia suggest the inclusion of
Phaiomys leucurus
,
Microtus clarkei
, and
Lasiopodomys fuscus
into
Neodon
and moving
Neodon juldaschi
into
Microtus
(
Blanfordimys
). In addition, three new species of
Neodon
(
N
.
linzhiensis
,
N
.
medogensis
, and
N
.
nyalamensis
) have recently been described from Tibet. Analyses of concatenated mitochondrial (
Cytb
,
COI
) and nuclear (
Ghr
,
Rbp3
) genes recovered
Neodon
as a well-supported monophyletic clade including all the recently described and relocated species. Kimura-2-parameter distance between
Neodon
from western Nepal compared to
N
.
sikimensis
(K2P = 13.1) and
N
.
irene
(K2P = 13.4) was equivalent to genetic distances observed between recognized species of this genus. The specimens sampled from western Nepal were recovered sister to
N
.
sikimensis
in the concatenated analysis. However, analyses conducted exclusively with mitochondrial loci did not support this relationship. The occlusal patterns of the first lower (m1) and third upper (M3) molars were simpler in specimens from western Nepal in comparison to
N
.
sikimensis
from eastern Nepal and India. Twelve craniodental characters and four external field measurements were examined from specimens of
N
.
sikimensis
from eastern Nepal and India,
N
.
irene
, and
Neodon
from western Nepal.
Neodon
from western Nepal were significantly different from
N
.
sikimensis
from eastern Nepal and India in ten out of 16 characters measured and from
N
.
irene
for all characters except ear height. Specimens from western Nepal were smaller in size than
N
.
sikimensis
from Eastern Nepal and India and larger than
N
.
irene
. Together the results of the molecular and morphological analyses indicate that
Neodon
from western Nepal are distinct under the phylogenetic, genetic and morpho species concepts.