重新评估马宗溪化石遗址中的 Nemavermes mackeei，扩大石炭纪环口动物的多样性

IF 1.3 4区地球科学 Q3 PALEONTOLOGY

Journal of Paleontology Pub Date : 2023-12-01 DOI:10.1017/jpa.2023.72

Victoria E. McCoy, Jack Wittry, Hamed Sadabadi, Paul S. Mayer

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引用次数: 0

摘要

Nemavermes mackeei Schram, 1973年，在Mazon Creek化石遗址和Bear Gulch石灰岩中被发现，最初被描述为一种自由生活的海洋线虫。在这里，我们调查了13个来自Mazon Creek的N. mackeei标本，以重新评估其形态和身份，以及两个最初被确定为Gilpichthys greenei Bardack和Richardson(1977)的标本。基于这些标本之间广泛的形态差异，马氏大蠊包含了多个仅具有远亲关系的物种。N. mackeei的原型是Tullimonstrum gregarium Richardson, 1966的一个喙部，使N. mackeei成为T. gregarium的初级同义词。然而，我们所调查的其他标本都不能归为灰带绦虫。我们从这些标本中命名了一个新物种:松鼠新属新种，一种环蝽。其中一个标本很可能是幼年绿鳗。其他标本在本研究中未被鉴定，但代表了各种蠕形双边动物。UUID: http://zoobank.org/d8c63f6a-0ef4-4a34-8dbd-c1d9099589cc

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A reappraisal of Nemavermes mackeei from the Mazon Creek fossil site expands Carboniferous cyclostome diversity

Nemavermes mackeei Schram, 1973, found in the Mazon Creek fossil site and the Bear Gulch Limestone, was described initially as a free-living marine nematode. Here we investigate 13 specimens of N. mackeei from the Mazon Creek to reassess its morphology and identity, and also two specimens originally identified as Gilpichthys greenei Bardack and Richardson, 1977. Based on the extensive morphological variation among these specimens, N. mackeei encompasses multiple species that are only distantly related. The holotype of N. mackeei is a proboscis of Tullimonstrum gregarium Richardson, 1966, making N. mackeei a junior synonym of T. gregarium. However, the other specimens that we investigated could not be attributed to T. gregarium. We name a new species from these specimens: Squirmarius testai new genus new species, a cyclostome. One specimen is likely a juvenile G. greenei. Other specimens were not identified during this study but represent a variety of vermiform bilaterians. UUID: http://zoobank.org/d8c63f6a-0ef4-4a34-8dbd-c1d9099589cc

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来源期刊

Journal of Paleontology 地学-古生物学

CiteScore

2.80

自引率

7.10%

发文量

审稿时长

6-12 weeks

期刊介绍： The Journal of Paleontology publishes original articles and notes on the systematics, phylogeny, paleoecology, paleogeography, and evolution of fossil organisms. It emphasizes specimen-based research and features high quality illustrations. All taxonomic groups are treated, including invertebrates, microfossils, plants, vertebrates, and ichnofossils.