Trace fossils of incisor marks indicate multiple inhabitants of burrowing systems rodents (Geomyidae) in the Oligocene (Chilapa Formation) of southern Mexico

IF 1.7 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Journal of South American Earth Sciences Pub Date : 2024-09-19 DOI:10.1016/j.jsames.2024.105171
Rosalía Guerrero-Arenas, Eduardo Jiménez-Hidalgo
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Abstract

Trace fossils produced by fossorial mammals are relatively common in the North American fossil record. Yaviichnus iniyooensis consists of a system of chambers and tunnels marked by characteristic paired-groove marks. This text aims to analyze four burrows with well-preserved bioglyphs to determine whether one or more individuals produced them. The burrows were found in the Chilapa Formation (early Oligocene), which outcrops on the outskirts of Santiago Yolomécatl town, northwestern Oaxaca. Bioglyphs are visible on the external surfaces of the tunnel casts. These marks are short, straight, and paired, and are attributable to the incisor marks of Gregorymys spp. They may have been produced during the same ecological period. Analysis of the measurements of the width of these paired marks revealed two distinct groups: one ranging from 2.2 to 3.2 mm (mean 2.95 mm; n = 12) and another ranging from 3.4 to 5.3 mm (mean 3.99 mm; n = 31). A Mann-Whitney U test indicated statistically significant differences between the median widths of the groups. The presence of two different groups of incisor marks within a single burrow system suggests that multiple individuals were the producers. This supports the hypothesis that several individuals of Gregorymys veloxikua and G. mixtecorum were the attributable producers of Yaviichnus iniyooensis. The most plausible explanation is that burrows were reused by specimens of both species of Gregorymys, possibly linked to aridity conditions and non-solitary behaviour.

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门齿痕迹化石表明墨西哥南部渐新世(奇拉帕地层)的穴居系统啮齿动物(Geomyidae)有多种居民
在北美化石记录中,哺乳动物化石产生的痕迹化石比较常见。Yaviichnus iniyooensis 由一个洞室和隧道系统组成,并以特征性的成对沟痕为标志。本文旨在分析四个保存完好的洞穴,以确定这些洞穴是否由一个或多个个体形成。这些洞穴发现于瓦哈卡州西北部圣地亚哥-约洛梅卡特尔镇郊外的奇拉帕地层(渐新世早期)。在隧道铸件的外表面可以看到生物文字。这些痕迹短、直、成对,可归类为格雷戈里米斯(Gregorymys)的门齿痕迹,可能产生于同一生态时期。对这些成对痕迹宽度的测量结果进行分析后发现,有两组不同的痕迹:一组为 2.2 至 3.2 毫米(平均 2.95 毫米;n = 12),另一组为 3.4 至 5.3 毫米(平均 3.99 毫米;n = 31)。Mann-Whitney U 检验表明,各组的中位宽度之间存在显著的统计学差异。在一个洞穴系统中出现了两组不同的门齿印记,这表明制作者是多个个体。这支持了这样的假设:Gregorymys veloxikua 和 G. mixtecorum 的多个个体是 Yaviichnus iniyooensis 的主要制造者。最合理的解释是,洞穴被这两个物种的标本重复使用,这可能与干旱条件和非独居行为有关。
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来源期刊
Journal of South American Earth Sciences
Journal of South American Earth Sciences 地学-地球科学综合
CiteScore
3.70
自引率
22.20%
发文量
364
审稿时长
6-12 weeks
期刊介绍: Papers must have a regional appeal and should present work of more than local significance. Research papers dealing with the regional geology of South American cratons and mobile belts, within the following research fields: -Economic geology, metallogenesis and hydrocarbon genesis and reservoirs. -Geophysics, geochemistry, volcanology, igneous and metamorphic petrology. -Tectonics, neo- and seismotectonics and geodynamic modeling. -Geomorphology, geological hazards, environmental geology, climate change in America and Antarctica, and soil research. -Stratigraphy, sedimentology, structure and basin evolution. -Paleontology, paleoecology, paleoclimatology and Quaternary geology. New developments in already established regional projects and new initiatives dealing with the geology of the continent will be summarized and presented on a regular basis. Short notes, discussions, book reviews and conference and workshop reports will also be included when relevant.
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