副竹鼠(拟速掘鼠亚科,鼠超科)一新种在甘肃临夏盆地的发现

doi:10.19615/j.cnki.2096-9899.220403

古脊椎动物学报 ›› 2022, Vol. 60 ›› Issue (4): 271-277.DOI: 10.19615/j.cnki.2096-9899.220403

副竹鼠(拟速掘鼠亚科,鼠超科)一新种在甘肃临夏盆地的发现

王伴月()

中国科学院古脊椎动物与古人类研究所北京 100044

收稿日期:2022-02-17 出版日期:2022-10-20 发布日期:2022-10-27
通讯作者: wangbanyue@ivpp.ac.cn
基金资助:
中国科学院前沿科学重点研究项目(QYZDY-SSW-DQC022);中国科学院战略性先导科技专项(B类)(XDB26000000)

A new species of Pararhizomys (Tachyoryctoidinae, Muroidea) from Linxia Basin of Gansu Province

WANG Ban-Yue()

Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences Beijing 100044

Received:2022-02-17 Published:2022-10-20 Online:2022-10-27

摘要/Abstract

摘要：

西北大学的野外考察队于2018年5月在甘肃广河县下杨湾附近的柳树组岩层的地表采得一啮齿类头骨的前部。该头骨的基本形态符合副竹鼠(Pararhizomys)的属征,但个体要比该属现已知的种都小,可能代表副竹鼠类一新种,命名为小副竹鼠(Pararhizomys parvulus)。新种的主要特征是：个体很小;臼齿齿冠较高,上臼齿系前侧高冠和舌侧高冠;M1‒3的舌侧内凹垂向深于颊侧的中凹;M3冠面视显示内凹和中凹均横向延伸,彼此稍重叠,内凹宽于中凹。根据Pararhizomys的进化趋势,在副竹鼠已知的4个种中,P. parvulus与P. huaxiaensis共有上臼齿具舌侧高冠和M3具横向延伸的内凹和中凹的特点,两种可能组成姐妹组。根据其臼齿的齿冠更高和内凹垂向深度更深的特点判断,P. parvulus可能比Pararhizomys目前已知的种(包括P. huaxiaensis)都进步。

关键词: 甘肃临夏盆地, 晚中新世, 柳树组, 拟速掘鼠亚科,副竹鼠属

Abstract:

An anterior part of skull was recently found near Xiayangwan in Guanghe County, Gansu Province, presumably from the Liushu Formation. The skull represents a new species of Pararhizomys, named as Pararhizomys parvulus. The new species is characterized by: small size, upper molars higher crowned and mesio-lingually hypsodont with sinus deeper than mesosinus; sinus and mesosinus in M3 being transverse and overlapping each other, but sinus longer than mesosinus on occlusal view. Based on shared apomorphies (lingually hypsodont upper molars and transverse sinus and mesosinus on M3 occulsal surface), P. parvulus and P. huaxiaensis are supposed to form a sister group. However, P. parvulus may be more derived than P. huaxiaensis as demonstrated by the more hypsodont molars and the deeper sinus in M3.

Key words: Linxia Basin, Gansu, Late Miocene, Liushu Formation, Pararhizomys, Tachyoryctoidinae

中图分类号:

Q915.873

王伴月. 副竹鼠(拟速掘鼠亚科,鼠超科)一新种在甘肃临夏盆地的发现. 古脊椎动物学报, 2022, 60(4): 271-277.

WANG Ban-Yue. A new species of Pararhizomys (Tachyoryctoidinae, Muroidea) from Linxia Basin of Gansu Province. Vertebrata Palasiatica, 2022, 60(4): 271-277.

图/表 3

Fig. 1 Skull of Pararhizomys parvulus sp. nov. (IVPP V 26661, holotype) A. ventral view (stereopair); B. anterior view; C. left lateral view; D. right lateral view; E. dorsal view Foramina and other structures: araml. anterior rim of attachment area for m. masseter lateralis 外层咬肌附着区前缘;I2. second upper incisor 第二上门齿;inf. incisive foramen 门齿孔;iof. infraorbital foramen 眶下孔;lt. lacrimal tubercle 泪结节;mt. masseteric tubercle 咬肌结节;pmldc. premaxillary laterodorsal crest 前颌骨侧背嵴;ppf. posterior palatine foramen 腭后孔;ps. palatine sulcus 腭沟;vsiof. ventral slit of infraorbital foramen 眶下孔腹侧裂隙Bones: F. frontal; L. lacrimal; M. maxilla; N. nasal; Pl. palatine; Pm. premaxilla

Fig. 2 Left M1?3 of Pararhizomys parvulus sp. nov. (IVPP V 26661, holotype) A. buccal view; B. occlusal view; C. lingual view

Table 1 Measurements of teeth of Pararhizomys parvulus sp. nov. (IVPP V 26661) (mm)

Parameter*	M1‒3	M1‒2	M1		M2		M3			I2
Parameter*	L	L	L	W	L	W	L	W	Hpl	L	W
Left	6	4.4	2.4	2.3	1.8	2.1	1.6	1.5	1.1	2	1.7
Right		4.4	2.4	2.3	1.7	2.1				2	1.7

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副竹鼠(拟速掘鼠亚科,鼠超科)一新种在甘肃临夏盆地的发现

A new species of Pararhizomys (Tachyoryctoidinae, Muroidea) from Linxia Basin of Gansu Province

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