A New Addition to the Devonian Elasmobranch Fauna of Michigan, U.S.A.

IF 0.6 4区环境科学与生态学 Q4 Agricultural and Biological Sciences

American Midland Naturalist Pub Date : 2020-07-01 DOI:10.1637/0003-0031-184.1.109

A. L. Swinehart, M. Hoenig, M. Ginter

引用次数: 1

Abstract

Abstract. A tooth of Phoebodus cf. P. sophiae (Chondrichthyes, Elasmobranchii) was recovered from the Middle Devonian, Early Givetian, Rockport Quarry Limestone Formation in Alpena, Michigan. It is the first known record of the taxon in Michigan and the third known locality from North America. It is the oldest known record in North America, and possibly worldwide, and may extend the known temporal range of the genus. Previous known records for P. sophiae have been confined to the middle Givetian Polygnathus varcus conodont zone, and the taxon was thought to be a possible index fossil for the middle Givetian. The present record extends the taxon to the early Givetian P. hemiansatus conodont zone and, thus, complicates the use of P. sophiae as a proxy index fossil for the P. varcus zone.

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美国密歇根泥盆纪Elasmobranch动物群的新成员。

摘要在密歇根州Alpena的中泥盆纪、早吉维期Rockport Quarry石灰岩地层中发现了一颗Phoebodus cf.P.sophiae（软骨鱼类，Elasmobranchii）的牙齿。这是密歇根州已知的第一个分类单元记录，也是北美洲已知的第三个地方。它是北美洲已知的最古老的记录，可能是全世界已知的记录，并可能扩大该属的已知时间范围。以前已知的P.sophiae记录仅限于中吉维阶多颚牙形石牙形石带，该分类单元被认为是中吉维纪的可能索引化石。目前的记录将该分类单元扩展到了早期的吉维阶半牙形石牙形石带，因此，将P.sophiae作为P.varcus带的替代索引化石的使用变得复杂。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

American Midland Naturalist 环境科学-生态学

CiteScore

1.20

自引率

0.00%

发文量

审稿时长

18-36 weeks

期刊介绍： The American Midland Naturalist has been published for 90 years by the University of Notre Dame. The connotations of Midland and Naturalist have broadened and its geographic coverage now includes North America with occasional articles from other continents. The old image of naturalist has changed and the journal publishes what Charles Elton aptly termed "scientific natural history" including field and experimental biology. Its significance and breadth of coverage are evident in that the American Midland Naturalist is among the most frequently cited journals in publications on ecology, mammalogy, herpetology, ornithology, ichthyology, parasitology, aquatic and invertebrate biology and other biological disciplines.