墨西哥Aptian地区保存完好的Atherfieldastacus magnus(十足目,雕形目)的表皮

Q3 Earth and Planetary Sciences Geologija Pub Date : 2020-01-01 DOI:10.5474/geologija.2020.004
Oscar González-León, J. Moreno-Bedmar, R. Barragán-Manzo, F. Vega
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引用次数: 1

摘要

化石十足甲壳类动物的角质层结构不仅是古生物学和地貌学解释的重要工具,而且是系统表征角质层未受成岩作用严重改变的属甚至种的潜在方法。根据不同地区同一物种标本的角质层结构的完整性和比较,具有丰富的十足甲壳类动物遗骸的地区可以解释为反映了大量死亡事件或仅仅是简单的蜕皮堆积。通过微相分析将缺氧事件联系起来,可以为解释十足甲壳类动物遗骸的不寻常丰度提供线索。早白垩世龙虾Atherfieldastacus magnus (M 'Coy, 1849)就是这种情况,它在全球不同的下白垩世(主要是阿普tian)岩石地层单元中被大量发现。在这种情况下,我们记录了来自墨西哥奇瓦瓦(Chihuahua)上Aptian的标本保存完好的角质层结构,这些标本以三维形式保存,主要以结块形式保存,并在不同的横切面上研究了龙虾身体不同部位的角质层。薄薄的角质层显示出典型的甲壳类动物角质层结构,表明这些尸体是在缺氧环境中保存的。
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Well-preserved cuticle of Atherfieldastacus magnus (Decapoda, Glypheida) from the Aptian of Mexico
The cuticle structure of fossil decapod crustaceans is an important tool, not only for palaeocological and taphonomic interpretations, but also as a potential way to characterise systematically genera and even species the cuticle of which has not been severely altered by diagenetic processes. Localities with abundant decapod crustacean remains can be interpreted either as reflecting mass mortality events or just simple accumulations of exuviae, on the basis of completeness and comparison of cuticle structures between specimens of the same species from different localities. Association with anoxic events by microfacies analyses can offer clues to explain the unusual abundance of decapod crustacean remains. This is the case for the Early Cretaceous lobster Atherfieldastacus magnus (M’Coy, 1849), which is found in large numbers in different Lower Cretaceous (mainly Aptian) lithostratigraphic units across the globe. In this case, we document the well-preserved cuticle structure of specimens from the upper Aptian of Chihuahua (Mexico), preserved three-dimensionally, mainly in concretions, which were studied in different transverse sections showing the cuticle in diverse portions of the lobster body. Thin cuticle layers show the typical crustacean cuticular structure that suggest these are corpses preserved in an anoxic environment.
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来源期刊
Geologija
Geologija Earth and Planetary Sciences-Geophysics
CiteScore
1.00
自引率
0.00%
发文量
10
审稿时长
10 weeks
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