Quantifying Late Pennsylvanian Multivariate Morphological Change in the Fusulinid Genus Triticites from the Central and Southwestern United States

IF 0.9 4区 地球科学 Q4 PALEONTOLOGY Journal of Foraminiferal Research Pub Date : 2021-07-31 DOI:10.2113/gsjfr.51.3.165
Eileah R. Sims, C. Belanger
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引用次数: 2

Abstract

Fusulinid Foraminifera are important for biostratigraphic correlation of strata in the Upper Paleozoic of the central and southwestern United States due to their high abundance and diversity in shallow marine carbonates. These correlations rely on consistent species-level identifications as well as geographically consistent morphological variation within species. However, many taxonomically important characters are described qualitatively, which can lead to conflicting identifications among taxonomists and cause biostratigraphic disagreements. Quantitative morphometric comparisons among species can increase the consistency of identifications among workers and capture temporal and geographic morphological gradients. Here, we used 14 linear measurements to describe the morphology of 18 biostratigraphically important species within the genus Triticites. Canonical variates analysis (CVA) showed that whereas specimens of a given species occupy similar areas of morphospace, species overlap considerably and, thus, these linear measurements poorly differentiate among species. However, species morphology covaried with geological age and multivariate analyses focused on age differences reveal an increase in the size of the initial chamber (proloculus) and a relative decrease in test expansion along the long axes over time. These morphological changes are consistent with an adaptation to shallow water conditions following the fall in relative sea-level across the Virgilian-Newwellian/Bursumian transition. Given the consistency of the morphological shift among North American basins, these morphological changes may be more useful for the recognition of the Virgilian-Newwellian/Bursumian transition than species-level biozones because they do not depend on consistent species identification.
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量化美国中部和西南部燧发枪手属Tritices的宾夕法尼亚晚期多变量形态变化
Fusulinid有孔虫在美国中部和西南部上古生界的地层对比中具有重要意义,因为它们在浅海碳酸盐中具有丰富的丰度和多样性。这些相关性依赖于一致的物种水平鉴定以及物种内地理上一致的形态变异。然而,许多重要的分类学特征是定性描述的,这可能导致分类学家之间的鉴定冲突,并导致生物地层的分歧。物种之间的定量形态比较可以增加工蚁之间识别的一致性,并捕获时间和地理形态梯度。在这里,我们用14个线性测量来描述小麦质岩属中18个生物地层学重要物种的形态。典型变量分析(CVA)表明,虽然同一物种的标本占据相似的形态空间区域,但物种重叠很大,因此,这些线性测量在物种之间很难区分。然而,物种形态随地质年龄的变化而变化,多变量分析表明,随着时间的推移,原始腔室(前腔)的大小增加,沿着长轴的试验扩展相对减少。这些形态变化与在弗吉尼亚-纽威尔/布尔苏米亚过渡时期相对海平面下降后对浅水条件的适应一致。考虑到北美盆地之间形态变化的一致性,这些形态变化可能比物种水平的生物带更有助于识别弗吉尼亚-纽维尔/布尔苏米亚过渡,因为它们不依赖于一致的物种识别。
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来源期刊
Journal of Foraminiferal Research
Journal of Foraminiferal Research 地学-古生物学
CiteScore
2.10
自引率
9.10%
发文量
32
审稿时长
>12 weeks
期刊介绍: JFR publishes original papers of international interest dealing with the Foraminifera and allied groups of organisms. Review articles are encouraged.
期刊最新文献
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