上白垩纪Vivian组Enchodus(Actinopterygii,Aulopiformes,Enchodonidae)的秘鲁首次记录

IF 0.9 4区 地球科学 Q3 GEOLOGY
Soledad Gouiric-Cavalli, A. L. Cione, D. Tineo, L. Pérez, Martín Iribarne, Miguel A. Allcca Torres, D. Poiré
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引用次数: 3

摘要

我们描述了与颌骨无关的孤立硬骨鱼牙齿。这些标本是在秘鲁亚安第斯地区晚白垩纪Vivian组的海洋沉积物中发现的。牙齿所在的沉积序列被解释为低盐度的向上变浅序列。该鱼类材料被鉴定为Enchodus aff。E.唐菖蒲基于一个小但发育良好的顶端后倒钩,一个前切削刃,冠部横截面对称,具有乙状轮廓,并具有强大的脊(=条纹)。秘鲁材料与典型的唐菖蒲牙齿的不同之处在于,它有一个锯齿状的前切削刃,这在大多数唐菖蒲标本中都没有。我们还强调,必须谨慎对待基于孤立牙齿的分类分配。尽管材料稀少,但所回收的材料表明,秘鲁的海洋单元可以提供有关白垩纪晚期太平洋鱼类区系的宝贵信息。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The first Peruvian record of Enchodus (Actinopterygii, Aulopiformes, Enchodontidae) in the Upper Cretaceous Vivian Formation
We describe isolated teleostean teeth found in no association with the jaw bone. The specimens have been recovered in Late Cretaceous marine deposits of the Vivian Formation in the Peruvian Sub-Andean Region. The deposition sequence from where the teeth come is interpreted as a shallowing-upward sequence of low salinity. The fish material is identified as Enchodus aff. E. gladiolus based on the presence of a small but well-developed post-apical barb, an anterior cutting edge, the crown is symmetrical in cross-section, have a sigmoidal profile, and bears strong ridges (=striations). The Peruvian material differs from the typical E. gladiolus teeth in having a faintly serrated anterior cutting edge which is absent in most specimens referred to E. gladiolus. We also highlight that taxonomic assignments made based on isolated teeth must be taken with care. Despite scarce, the material recovered denotes that the marine units of Peru can give valuable information about the Pacific fish fauna during the Late Cretaceous.
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来源期刊
Andean Geology
Andean Geology 地学-地质学
CiteScore
3.90
自引率
0.00%
发文量
17
审稿时长
>12 weeks
期刊介绍: This journal publishes original and review articles on geology and related sciences, in Spanish or English, in three issues a year (January, May and September). Articles or notes on major topics of broad interest in Earth Sciences dealing with the geology of South and Central America and Antarctica, and particularly of the Andes, are welcomed. The journal is interested in publishing thematic sets of papers and accepts articles dealing with systematic Paleontology only if their main focus is the chronostratigraphical, paleoecological and/or paleogeographical importance of the taxa described therein.
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