A NEW PROSCIURINE RODENT FROM SHANTUNG PROVINCE, CHINA
A NEW PROSCIURINE RODENT FROM SHANTUNG PROVINCE, CHINA
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DOI：
10.1017/s0022336000022289
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发表时间：
1986-05-01
影响因子：
1.4
通讯作者：
LI, CK
中科院分区：
文献类型：
--
作者：
RENSBERGER, JM;LI, CK
一种新的啮齿动物--火龙的下臼齿？来自中国东部次表层的山东人增加了已知的亚洲精氨酸无齿石的多样性，并增加了无齿石在渐新世在欧亚大陆广泛分布的可能性。这一形式在结构上与北美的火龙鱼相似，尤其是渐新世中期的火龙鱼。后锥体被强烈压缩，高度降低，这种情况部分发生在P.relictus身上，但这里的情况更极端。中圆锥体的高度和侧长的程度比北美火龙目的更高级。P.？Shantungensis与ArgyroPulo(1939)和Kosalski(1974)所描述的哈萨克斯坦[苏联]和蒙古的松果体状下牙列在牙冠发育和尖端形态细节上不同。亚洲火腿的类型或推定的火腿种类是上牙列，其相关的下牙列尚不清楚，但罗氏火龙的牙冠坡度太低，无法与P。山东型的上牙期和山东型上牙列的放纵程度比山东型的要小。
A lower molar of a new species of rodent, Prosciurus ? shantungensis, from the subsurface of eastern China adds to the diversity of the known Asian prosciurine aplodontids and increases the likelihood that aplodontids were widespread in Eurasia during the Oligocene. This form is structurally close to the North American prosciurine aplodontids, especially Prosciurus relictus from the middle Oligocene. The metaconid is strongly compressed and reduced in height, a condition partially developed in P. relictus but here more extreme. Height of the mesoconid and the degree of lophodonty are more advanced than in North American species of Prosciurus. P. ? shantungensis differs from the prosciurine-like lower dentitions from Kazakhstan [USSR] and Mongolia described by Argyropulo (1939) and Kowalski (1974) in crest development and in details of the cusp morphology. Types of the Asian prosciurine or presumed prosciurine species are upper dentitions for which associated lower dentitions are unknown yet the slope of the crests in Prosciurus lohiculus is too low to match the occlusal surface in P. ? shantungensis and the degree of lophodonty in P. arboraptus is less than would be expected for the upper dentition of the Shantung form.