Tough to digest: first record of Teleosauroidea (Thalattosuchia) in a regurgitalite from the Upper Jurassic of north‐eastern Italy

IF 2.3 2区 地球科学 Q1 PALEONTOLOGY
G. Serafini, Caleb M. Gordon, D. Foffa, M. Cobianchi, L. Giusberti
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引用次数: 2

Abstract

Postcranial remains of a small teleosauroid from the Upper Jurassic of north‐eastern Italy are described in detail. The specimen, discovered in 1980 on a slab of Rosso Ammonitico Veronese (RAV Fm.; Bajocian–Tithonian), is represented by partially articulated thoracic, sacral and anterior caudal vertebrae, fractured and displaced osteoderms and pelvic girdle elements. Additional bone elements overlap one another in a densely packed cluster. The peculiar arrangement of this specimen is here interpreted as the result of regurgitation of the animal carcass from a pelagic predator or scavenger. Microstructural and geochemical evidence from bone and surrounding matrix support this hypothesis. A dearth of phosphorus in the matrix near the bone mass corroborates the interpretation of the specimen as a regurgitalite rather than a coprolite. Calcareous nannofossil and stratigraphic data allow us to assign the fossil to the latest Kimmeridgian or earliest Tithonian. The specimen is here tentatively referred to the teleosauroid subfamily Aeolodontinae based on the alternating pattern of the osteoderm ornamentation; this attribution is supported by stratigraphical and palaeoenvironmental evidence. If confirmed, this represents the first occurrence of Aeolodontinae in Italian outcrops of the western Tethys margin and represents the first marine crocodylomorph described as a bromalite.
难以消化:意大利东北部上侏罗世的反流岩中首次记录了远龙总科(Thalattosuchia)
详细描述了意大利东北部上侏罗纪的一种小型远蜥类恐龙的颅后遗骸。该标本于1980年在Veronese (RAV Fm.;Bajocian-Tithonian),表现为部分关节的胸椎、骶骨和前尾椎、骨折和移位的骨皮和骨盆带元素。额外的骨元素在密集的集群中相互重叠。这个标本的奇特排列在这里被解释为动物尸体被远洋捕食者或食腐动物反刍的结果。骨骼和周围基质的微观结构和地球化学证据支持这一假设。在骨团附近的基质中缺乏磷,证实了该标本是反流石而不是粪化石的解释。钙质纳米化石和地层资料使我们确定该化石属于最晚的金默里纪或最早的梯东纪。根据骨皮纹饰的交替模式,该标本在此暂定为端骨龙亚科;这一归因得到了地层和古环境证据的支持。如果得到证实,这代表了Aeolodontinae在意大利西特提斯边缘露头中的首次出现,并代表了第一个被描述为溴石的海洋鳄鱼形。
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来源期刊
Papers in Palaeontology
Papers in Palaeontology PALEONTOLOGY-
CiteScore
4.50
自引率
4.30%
发文量
55
期刊介绍: Papers in Palaeontology is the successor to Special Papers in Palaeontology and a journal of the Palaeontological Association (www.palass.org). The journal is devoted to the publication of papers that document the diversity of past life and its distribution in time and space. Papers in Palaeontology is devoted to the publication of papers that document the diversity of past life and its distribution in time and space. As a sister publication to Palaeontology its focus is on descriptive research, including the descriptions of new taxa, systematic revisions of higher taxa, detailed biostratigraphical and biogeographical documentation, and descriptions of floras and faunas from specific localities or regions. Most contributions are expected to be less than 30 pp long but longer contributions will be considered if the material merits it, including single topic parts. The journal publishes a wide variety of papers on palaeontological topics covering: palaeozoology, palaeobotany, systematic studies, palaeoecology, micropalaeontology, palaeobiogeography, functional morphology, stratigraphy, taxonomy, taphonomy, palaeoenvironmental reconstruction, palaeoclimate analysis, biomineralization studies.
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