这是一个伪造的“嵌合体”,其中包括来自巴西下白垩纪桑塔纳群的原棘海龟Santanachelysgaffneyi的第二个标本和pleurodire Araripemys的外壳部分。

IF 3 2区 地球科学 Q1 PALEONTOLOGY
Torsten M Scheyer, Gustavo R Oliveira, Pedro S R Romano, Dylan Bastiaans, Lisa Falco, Gabriel S Ferreira, Márton Rabi
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引用次数: 0

摘要

适应开放海洋生活方式的白垩纪海龟化石至今仍是罕见的发现。此外,现存的海龟、类龟和其他中生代海龟之间的关系仍然存在争议,其中一个关键物种是Santanachelys gaffneyi Hirayama, 1998年,长期以来被认为是最早的真正的海龟。该物种是白垩纪早期原stegidae的成员,这是一个有争议的分支,要么位于龟总纲内,要么与龟总纲密切相关,要么沿着隐颈龟(隐颈龟)的茎系,代表着一种独立的开放海洋辐射。Santanachelys gaffneyi是保存最完整的早期原甾类动物之一,因此对建立该类群的全球系统发育地位至关重要。然而,这个分类单元的单个已知标本尚未得到详细描述。本文描述了巴西东北部Araripe盆地Santana群Romualdo组(Aptian晚期)的第二个Santanachelys gaffneyi类型层位标本。保存下来的骨骼部分包括颅骨后部、颈椎、肩带、甲壳最前部和左/中央部分,外周物很少,以及缺少大部分椎体的板状体。甲壳的剩余部分显然是由化石交易商使用胸骨diran Araripemydidae的前部完成的,初步确定为cf. Araripemys barretoi的外壳部分,这是一种更常见的桑塔纳化石龟,以及其他不确定的龟壳碎片。本文的目的是报告该标本返回巴西的情况,并提供初步描述。补充信息:在线版本包含补充资料,下载地址:10.1186/s13358-023-00271-9。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A forged 'chimera' including the second specimen of the protostegid sea turtle Santanachelysgaffneyi and shell parts of the pleurodire Araripemys from the Lower Cretaceous Santana Group of Brazil.

Fossils of Cretaceous sea turtles adapted to an open marine lifestyle remain rare finds to date. Furthermore, the relationships between extant sea turtles, chelonioids, and other Mesozoic marine turtles are still contested, with one key species being Santanachelys gaffneyi Hirayama, 1998, long considered the earliest true sea turtle. The species is an Early Cretaceous member of Protostegidae, a controversial clade either placed within or closely related to Chelonioidea or, alternatively, along the stem lineage of hidden-neck turtles (Cryptodira) and representing an independent open marine radiation. Santanachelys gaffneyi is one of the most completely preserved early protostegids and is therefore critical for establishing the global phylogenetic position of the group. However, the single known specimen of this taxon is yet to be described in detail. Here we describe a second specimen of Santanachelys gaffneyi from its type horizon, the Romualdo Formation (late Aptian) of the Santana Group of the Araripe basin, NE Brazil. The skeletal elements preserved include the posterior part of the skull, neck vertebrae, shoulder girdle, anterior-most and left/central part of the carapace with few peripherals, and plastron lacking most of the hyoplastra. The remaining part of the carapace was apparently completed by fossil dealers using an anterior part of the pleurodiran Araripemydidae, tentatively identified as a shell portion of cf. Araripemys barretoi, a more common Santana fossil turtle, among other indeterminate turtle shell fragments. The purpose of this paper is to report the repatriation of the specimen to Brazil and to provide a preliminary description.

Supplementary information: The online version contains supplementary material available at 10.1186/s13358-023-00271-9.

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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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