新疆迟滞鳄类新材料

doi:10.19615/j.cnki.1000-3118.200415

摘要/Abstract

摘要：

迟滞鳄类最早的化石记录来自甘肃玉门的大山口动物群,但是中国此类动物的化石记录相对俄罗斯来说少了许多,尤其是三叠纪的。新疆已知唯一的一件标本出自锅底坑组上部。报道了产自不同层位的3件迟滞鳄类新材料,分别出自泉子街组、锅底坑组底部以及韭菜园组。这些新发现丰富了中国迟滞鳄类的多样性以及时代延限。来自锅底坑组及韭菜园组的毕氏螈科(Bystrowianidae)材料表明这类动物在二叠纪末期大灭绝中在新疆生存了下来。

关键词: 新疆, 二叠系, 三叠系, 泉子街组, 锅底坑组, 韭菜园组, 毕氏螈科, 迟滞鳄类

Abstract:

Chroniosuchians have the earliest representatives in Gansu, China, but the Chinese records were scarcer compared to Russia, especially the Triassic one. In Xinjiang, there was only one specimen reported from the upper part of the Guodikeng Formation. Here three new chroniosuchian specimens are reported from three new stratigraphic horizons: the Quanzijie Formation (middle Permian), the base of the Guodikeng Formation (upper Permian), and the Jiucaiyuan Formation (Lower Triassic). The osteoderm from the Jiucaiyuan Formation represents the first definite Triassic chroniosuchian from China. The new findings increase the chroniosuchian diversity and their time range in China. The bystrowianid chroniosuchian specimens from the Guodikeng and Jiucaiyuan formations demonstrated that this group survived in the end-Permian mass extinction in Xinjiang, China.

Key words: Xinjiang, China, Permian, Triassic, Quanzijie Formation, Guodikeng Formation, Jiucaiyuan Formation, Bystrowianidae, chroniosuchians

中图分类号:

Q915.864

刘俊. 新疆迟滞鳄类新材料. 古脊椎动物学报, 2020, 58(4): 283-292.

LIU Jun. New chroniosuchian materials from Xinjiang, China. Vertebrata Palasiatica, 2020, 58(4): 283-292.

图/表 4

Fig. 1 Permian to Triassic stratigraphic sequence within Turpan-Hami Basin, Xinjiang, showing the horizons of studying specimens

Fig. 2 Chroniosuchian left femur (IVPP V 26539) from the Quanzijie Formation in Jimusar, Xinjiang in extensor (A), anterior (B), flexor (C), proximal (D), and distal (E) views Abbreviations: ab. adductor blade; ac. anterior (tibial) condyle; adc. adductor crest; ff. fibula fossa; icg. intercondylar groove; it. internal trochanter; itf. intertrochanteric fossa; pa. popliteal area; pc. posterior (fibular) condyle

Fig. 3 Bystrowianid specimen (IVPP V 26540) from the Guodikeng Formation in Turpan, Xinjiang A-B. four continuous vertebrae in ventral (A) and right lateral (B) views; C-D. isolated vertebra in anterior (C) and posterior (D) views; E. an incomplete rib; F-G. the impression of dorsal surface of three osteoderms (F) and two osteoderms (G) Abbreviations: dp. diapophysis; ic. intercentrum; ns. neural spine; pc. pleurocentrum; pnc. paraneural canal; poz. postzygapophysis; pp. parapophysis; prz. prezygapophysis; tp. transverse process; vp. ventral process of osteoderm; vr. ventral ridge

Fig. 4 Bystrowianid osteoderm (IVPP V 26541) from the Jiucaiyuan Formation in Jimusar, Xinjiang in dorsal (A), ventral (B), and posterior (C) views Abbreviations: am. area marginalis; ap. accessory process; aw. anterior wing; cl. lateral crista; cm. medial crista; co. crista obliqua; df. dorsal facet; dv. ventral depression; fa. facies alaris; pv. ventral process; sa. sulcus articularis

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