The makers of Rhamphichnus ispp. reinterpreted as lepidosaurian and crocodilian, not pterosaurian

IF 1.6 4区 地球科学 Q2 PALEONTOLOGY Geobios Pub Date : 2023-04-01 DOI:10.1016/j.geobios.2022.12.001
Anton F.-J. Wroblewski
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引用次数: 1

Abstract

Three ichnospecies of the Late Jurassic trace fossil genus Rhamphichnus were first described and interpreted as the walking tracks of non-pterodactyloid pterosaurs like Rhamphorhynchus. This despite not resembling any previously identified pterosaur tracks and having a morphology unmatched by pterosaur skeletal elements. To fit the pterosaurian model, elongated imprints of R. pereiraensis and R. lafaurii, displaying four or five digit impressions were interpreted as manus prints, while shorter, five-digit prints were interpreted as imprints made by pedes with dislocated metatarsals and disarticulated phalanges. Comparison of published images and descriptions of Rhamphichnus ispp. to skeletal elements of six contemporaneous non-pterodactyloid taxa, skeletons and tracks from pterodactyloid pterosaurs, and modern and ancient lepidosaurs and crocodilians suggests an alternative interpretation. R. crayssacensis closely resembles crocodilian (Crocodylopodus (Sustenodactylus) isp.) and crocodylomorph (Batrachopus isp.) tracks; its holotype trackway was found 50 cm away from and parallel to a crocodilian swimming trackway with the same sized feet, possibly made by the same individual. R. pereiraensis and R. lafaurii strongly resemble lepidosaurian tracks and match the size and morphology of contemporary rhynchocephalians. Prints originally interpreted as manual and pedal in R. pereiraensis and R. lafaurii are reinterpreted and transposed in light of new data from pterosaurian, lepidosaurian, and crocodilian tracks and anatomy. Identification of fossil trackmakers depends on comparisons of a wide range of candidate taxa and elimination of those that cannot be considered further. With this reinterpretation of Rhamphichnus, there are no non-pterodactyloid pterosaurian tracks yet identified in the fossil record.

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Rhampchichnus ispp的制造商。重新解释为鳞翅龙类和鳄鱼类,而不是翼龙类
晚侏罗世足迹化石Rhamphorhynchus属的三个翼龙种首次被描述并被解释为Rhamphorhynchus等非翼手类翼龙的行走轨迹。尽管与之前发现的任何翼龙的足迹都不相似,而且其形态与翼龙的骨骼元素也不匹配。为了符合翼龙模型,pereirar .和R. lafaurii的四趾或五趾脚印被解释为手爪脚印,而较短的五趾脚印被解释为跖骨脱臼和指骨断裂的足类脚印。鼠李属植物图片与描述的比较。对于同时期6个非翼手类类群的骨骼元素,来自翼手类翼龙、现代和古代鳞龙和鳄鱼的骨骼和足迹提出了另一种解释。小鳄与鳄鱼类(Crocodylopodus (Sustenodactylus))和鳄鱼类(Batrachopus isp.)的足迹非常相似;它的完整轨迹被发现与鳄鱼的游泳轨迹相距50厘米,并平行于鳄鱼的游泳轨迹,它们的脚大小相同,可能是由同一个人制造的。pereirar .和lafaurii .与鳞翅目龙的足迹非常相似,其大小和形态与当代舌头龙相似。根据来自翼龙、鳞翅目和鳄鱼目的足迹和解剖学的新数据,对最初被解释为手印和脚印的pereiraensis和R. lafaurii进行了重新解释和转换。化石足迹制造者的鉴定取决于对大量候选分类群的比较,并排除那些不能进一步考虑的分类群。通过对鼠爪龙的重新解释,在化石记录中还没有发现非翼手类翼龙的足迹。
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来源期刊
Geobios
Geobios 地学-古生物学
CiteScore
3.30
自引率
6.20%
发文量
28
审稿时长
6-12 weeks
期刊介绍: Geobios publishes bimonthly in English original peer-reviewed articles of international interest in any area of paleontology, paleobiology, paleoecology, paleobiogeography, (bio)stratigraphy and biogeochemistry. All taxonomic groups are treated, including microfossils, invertebrates, plants, vertebrates and ichnofossils. Geobios welcomes descriptive papers based on original material (e.g. large Systematic Paleontology works), as well as more analytically and/or methodologically oriented papers, provided they offer strong and significant biochronological/biostratigraphical, paleobiogeographical, paleobiological and/or phylogenetic new insights and perspectices. A high priority level is given to synchronic and/or diachronic studies based on multi- or inter-disciplinary approaches mixing various fields of Earth and Life Sciences. Works based on extant data are also considered, provided they offer significant insights into geological-time studies.
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