摘要
本文记述了产自新疆准噶尔盆地上渐新统的双柱鼠科一新属——原双柱鼠属(Prodistylo-mys)。它具有一些较原始的特点,但代表不同于Distylomys的另一分支。它的颊齿是由下后方斜向前上方生长的。
A lot of fossil mammals were collected from Suosuoquan Formation at the northern edge
of Junggar Basin,Xinjiang Uygur Autonomous Region,China,by the staffs of a field team of
IVPP during the summer field season of 1982.Among them a left lower jaw representing a new
genus,Prodistylomys,is recognized and described in this paper,The new one is quite different
from the genus Distylomys,in the Family Distylomyidae.The discovery of it not only extends
the distribution of Distylomyidae,but also reveals some primitive features.Meanwhile,it throws
some light on the tooth grow way and the relationship between Distylomyidae and other cte-
nodactyloids.
SYSTEMATICS
?Ctenodactyloidea Simpson,1945
Distylomyidae Wang,1988
Prodistylomys xinjiangensis gen.et.sp.nov.
Holotype A fragmental lower jaw with I_1 and DP_4—M_3(IVPP:V 7962).
Locality and horizon IVPP:Loc.82503,Chibaerwoyi,the north bank of the Ulun-
gur River,Junggar Basin,Xinjiang,China;Upper Oligocene,Suosuoquan Formation.
Diagnosis A more primitive distylomyid close to Distylomys tedfordi in size.Differs
from Distylomys in following features:cheek teeth rooted;DP_4 with metaflexid and metafos-
setid,and shorter trigonid and talonid;molars trigonid short and wide rhombus in form and
talonid lozenge formed,longer and narrower than trigonid;M_(1-2) with developed metaflexid
and thin cement in ectoflexid and mesoflexid.
Etymology Pro+di+stylo+mys,Greek,meaning a primitive distylomyid.Xinjiang,
the name of the region where the fossil was collected.
Description and comparison:V 7962 is similar to Distylomys in some main fe-
atures of the lower jaw and the cheek teeth.It is close to D.tedfordi in size.DP_4 is similar to
P_4 of Distylomys in shape and structure,but with shorter trigonid and talonid,and the metafle-
xid and the circular restage of the metafossetid.The well develo
出处
《古脊椎动物学报》
CSCD
北大核心
1989年第1期28-36,共9页
Vertebrata Palasiatica
