来自美国阿拉巴马州威尔科克斯县下古新世（达尼安）波特溪地层的 Palaeohypotodus Glückman, 1964（软骨鱼类，瘤形目）新种

IF 1.4 4区地球科学 Q3 Earth and Planetary Sciences

Fossil Record Pub Date : 2024-02-07 DOI:10.3897/fr.27.e112800

Jun A. Ebersole, D. Cicimurri, T. L. Harrell Jr.

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引用次数: 0

摘要

阿拉巴马州地质调查局的历史藏品包括从美国阿拉巴马州西南部下古新世波特溪地层中发现的几件鲨鱼化石标本。在这些标本中，有 17 颗牙齿被我们认定为已灭绝的古新世鲨鱼属 Palaeohypotodus 中的一个新物种。通过对这些牙齿的详细检查，以及对现存各种鳞状鲨鱼牙齿的分析，我们确认了 Palaeohypotodus 的单颌和双颌异齿性。我们发现了上下前牙和侧牙锉，它们可以通过形态上的细微变化相互区分。此外，从美国阿拉巴马州和阿肯色州的其他达尼安时期出露的大量分离牙齿，加深了我们对该新种和该属整体的牙齿组成和发育异型的了解。

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A new species of Palaeohypotodus Glückman, 1964 (Chondrichthyes, Lamniformes) from the lower Paleocene (Danian) Porters Creek Formation, Wilcox County, Alabama, USA

The historic collection of the Geological Survey of Alabama includes several fossil shark specimens that were recovered from the lower Paleocene Porters Creek Formation in southwestern Alabama, USA. Among these specimens are 17 teeth that we herein recognize as a new species within the extinct Paleogene genus, Palaeohypotodus. Detailed examination of these individual teeth, coupled with analyses of the dentitions of various extant lamniform sharks, allowed us to confirm monognathic and dignathic heterodonty within Palaeohypotodus. We identified upper and lower anterior and lateral tooth files that can be differentiated from one another by minor variations in morphology. Additionally, numerous isolated teeth from other Danian exposures in Alabama and Arkansas, USA, enhance our understanding of the composition of the dentition and ontogenetic heterodonty of both the new species and the genus as a whole.

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来源期刊

Fossil Record PALEONTOLOGY-

CiteScore

2.50

自引率

7.10%

发文量

审稿时长

>12 weeks

期刊介绍： Fossil Record (FR) is the palaeontological journal of the Museum für Naturkunde Berlin. This journal was founded in 1998 under the name Mitteilungen aus dem Museum für Naturkunde Berlin, Geowissenschaftliche Reihe and appears with two issues each year. Fossil Record publishes original papers in all areas of palaeontology including the taxonomy and systematics of fossil organisms, biostratigraphy, palaeoecology, and evolution. All taxonomic groups are treated, including invertebrates, microfossils, plants, and vertebrates.