Comprehensive research on Late Eocene Hulgana cf. H. ertnia (Rodentia: Ischyromyidae)

doi:10.19615/j.cnki.2096-9899.250620

Vertebrata Palasiatica

Comprehensive research on Late Eocene Hulgana cf. H. ertnia (Rodentia: Ischyromyidae)

LI Lan-Xin^1,2 LI Qian^1*

(1 Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences Beijing 100044)
(2 College of Earth and Planetary Sciences, University of Chinese Academy of Sciences Beijing 100049)
* Corresponding author: liqian@ivpp.ac.cn

对晚始新世古蒙语鼠相似种(啮齿目：壮鼠科)的综合研究

李岚馨^1,2 李茜¹

(1 中国科学院古脊椎动物与古人类研究所北京 100044)
(2 中国科学院大学地球与行星科学学院北京 100049)

Abstract

Abstract:

A relatively well-preserved rodent fossil, including its incisors, cheek teeth, and postcranial skeleton, was collected from the Baiyin Obo in Siziwang Banner, Nei Mongol. A multifaceted research approach was undertaken in this study to conduct a comprehensive analysis on the newly discovered specimen. Based on a morphological comparison, the new specimen was identified as Hulgana cf. H. ertnia within the Ischyromyidae family. Incisive enamel microstructure analysis revealed the typical pauciserial enamel structure of Hulgana. Bone histological analysis indicates that the specimen represents a juvenile individual, which is consistent with the ontogenetic stage indicated by dental developmental stage and wear pattern. The application of geometric morphometrics to the calcaneus and bone histology of the femur and phalanx further substantiates the taxonomic classification of Hulgana as a terrestrial and cursorial rodent, exhibiting a degree of fossorial ability. This classification is analogous to that of certain extant cricetids and ground squirrels.

Key words: Baiyin Obo, Late Eocene, Hulgana, geometric morphometrics, locomotion, enamel microstructure, bone histology

摘要：

内蒙古四子王旗白音敖包地区新发现一保存较为完整的啮齿类化石，材料包含门齿、颊齿及头后骨骼。运用多种研究手段对其开展综合研究。根据形态对比，这一新化石被归入壮鼠科蒙语鼠属并鉴定为古蒙语鼠相似种(Hulgana cf. H. ertnia)。对其门齿釉质微观结构进行分析，结果显示为典型的散系釉质结构。骨组织学分析指示该标本为一年轻个体，这一结果也与其颊齿发育阶段以及磨蚀程度相符。新标本跟骨的几何形态测量学分析结果和股骨与指骨的骨组织学证据均支持蒙语鼠为一种擅奔跑的地栖型啮齿类，同时具备一定掘穴能力，与部分现生仓鼠及地松鼠等相似。

关键词: 白音敖包, 晚始新世, 蒙语鼠属, 几何形态测量学, 运动方式, 釉质微观结构, 骨组织学

LI Lan-Xin, LI Qian.in press Comprehensive research on Late Eocene Hulgana cf. H. ertnia (Rodentia: Ischyromyidae). Vertebrata Palasiatica, DOI: 10.19615/j.cnki.2096-9899.250620.

李岚馨, 李茜. 0, (): 1-, 对晚始新世古蒙语鼠相似种(啮齿目：壮鼠科)的综合研究. 古脊椎动物学报, DOI: 10.19615/j.cnki.2096-9899.250620.