New information on the dentition of Chaohusaurus zhangjiawanensis (Reptilia, Ichthyosauriformes) from the Early Triassic of Yuan’an, Hubei Province, China

IF 3 2区 地球科学 Q1 PALEONTOLOGY
Li-Ang Gu, Andrzej S. Wolniewicz, Jun Liu
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引用次数: 0

Abstract

Chaohusaurus is an early ichthyosauriform represented by three species known from the Early Triassic of Chaohu, Anhui Province, China, with a fourth species—Chaohusaurus zhangjiawanensis—known from the Nanzhang-Yuan’an region of Hubei Province. In contrast to the Chaohusaurus species from Chaohu, Chaohusaurus zhangjiawanensis remains poorly known, hindering our understanding of early ichthyosauriform evolution. Here, we report a new specimen of Chaohusaurus zhangjiawanensis, which provides new information on its dentition. The new specimen confirms that Chaohusaurus zhangjiawanensis had heterodont dentition consisting of pointed anterior teeth and robust, rounded posterior teeth, indicating a generalist diet. The posterior teeth of Chaohusaurus zhangjiawanensis are more robust (broader and larger) than the posterior dentition of Chaohusaurus chaoxianensis and Chaohusaurus brevifemoralis from Chaohu. This suggests differences in hard-shelled prey preference between species of Chaohusaurus from Chaohu and Nanzhang-Yuan’an, with Chaohusaurus zhangjiawanensis likely capable of feeding on harder and larger prey than Chaohusaurus brevifemoralis and Chaohusaurus chaoxianensis. In turn, this probably reflects differences in durophagous prey availability between the shallow-marine palaeoecosystem of Nanzhang-Yuan’an and the deeper, slope-basin palaeoecosystem of Chaohu. The posterior dentition and forefin of Chaohusaurus zhangjiawanensis are strikingly similar to those of Chaohusaurus geishanensis, the rarest species of Chaohusaurus from the Chaohu fauna. The scarcity of Chaohusaurus geishanensis in the Chaohu fauna, and its morphological similarity to Chaohusaurus zhangjiawanensis, possibly indicate that Chaohusaurus geishanensis was closely related with Chaohusaurus zhangjiawanensis and that it was also a shallow-marine species that was not a typical component of the Chaohu fauna. It probably occasionally wandered out into the deeper waters of Chaohu from a nearby coastal environment.
中国湖北远安早三叠世张家湾超龙(爬行动物门,鱼龙类)牙齿的新信息
巢湖龙(Chaohusaurus)是早期鱼龙类的代表,在中国安徽省巢湖早三叠世已知三个种,第四个种--张家湾巢湖龙(Chaohusaurus zhangjiawanensis)已知于湖北省南漳-远安地区。与巢湖的巢湖龙相比,张家湾巢湖龙仍然鲜为人知,这阻碍了我们对早期鱼龙类演化的了解。在此,我们报告了张家湾巢湖龙的新标本,并提供了有关其牙齿的新信息。新标本证实张家湾巢湖龙具有异齿性牙齿,由尖锐的前齿和粗壮、圆形的后齿组成,表明它是一种通食动物。张家湾潮龙的后齿比潮汕潮龙和巢湖潮龙的后齿更粗壮(更宽、更大)。这表明巢湖和南漳-远安的巢龙对硬壳猎物的偏好存在差异,张家湾巢龙可能比巢县巢龙和巢湖巢龙能捕食更硬和更大的猎物。反过来,这也可能反映了南漳-远安浅海古生态系统与巢湖较深的斜坡盆地古生态系统之间在吞食猎物方面的差异。张家湾巢湖龙的后齿和前鳍与巢湖动物群中最稀有的地山巢湖龙惊人地相似。地山龙在巢湖动物群中的稀缺性及其与张家湾龙的形态相似性,可能表明地山龙与张家湾龙亲缘关系密切,也是巢湖动物群中的浅海物种,并非巢湖动物群的典型组成部分。它可能偶尔从附近的沿海环境游荡到巢湖的深水区。
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来源期刊
Swiss Journal of Palaeontology
Swiss Journal of Palaeontology Earth and Planetary Sciences-Paleontology
CiteScore
4.30
自引率
16.70%
发文量
17
审稿时长
4 weeks
期刊介绍: The Swiss Journal of Palaeontology publishes original research and review articles of interest to the international community in the fields of palaeontology, taxonomy and systematics, while recognising at the same time the importance of documenting high-quality palaeontological data in a regional context. Palaeobiology in combination with alpha taxonomy is a core topic of the journal. Submitted papers should have an appeal as wide as possible, directed towards an international readership. Contributions should not have been simultaneously submitted elsewhere, and the overlap of content between related articles should be minimal. Duplications of text and the use of previously published illustrations without adequate citation are unacceptable. If a manuscript has two or more authors, both or all have to sign to confirm they all were involved in the work and have agreed to its submission. The preferred manuscript language is UK English, but consistently used US English is also acceptable. We encourage the publication of proceedings of international meetings as well as special thematic issues. Short contributions and book reviews are also accepted. An international editorial team as well as guest editors guarantee that the thematic issues as well as all articles in regular issues are peer-reviewed and meet the highest standards.
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