New species of Thylacocephala, Eodollocaris keithflinti n. gen., n. sp., from the Mazon Creek Lagerstätte, Illinois, United States (c. 307 Ma) and redescription of other Mazon Creek thylacocephalans

IF 1.5 3区地球科学 Q2 PALEONTOLOGY Geodiversitas Pub Date : 2021-05-06 DOI:10.5252/geodiversitas2021v43a10

Thomas Laville, J. Haug, C. Haug

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引用次数: 2

Abstract

ABSTRACT Thylacocephala is an enigmatic ingroup of Euarthropoda. Thylacocephalans, only known from Palaeozoic and Mesozoic fossils, are characterized by a particular anatomy: a prominent folded shield enveloping most of the body, large compound eyes, three pairs of large, presumably raptorial appendages and a trunk with 8-22 stout segments bearing swimming appendages. However, lifestyle(s) and phylogenetic relationships of Thylacocephala are still largely unknown. This study is focused on thylacocephalans from the Mazon Creek Lagerstätte (c. 307 Ma, Middle Pennsylvanian, Carboniferous). A new species is described from a siderite concretion of Mazon Creek: Eodollocaris keithflinti n. gen., n. sp. The new species displays a particular mixture of characters typical for Palaeozoic species on the one hand and Mesozoic species on the other hand. Additionally, new details of the appendages and of the trunk are provided for already known species from the same locality, namely Concavicaris georgeorum Schram, 1990 and Convexicaris mazonensis Schram, 1990. These new informations are helpful to better understand the possible lifestyle of these representatives of Thylacocephala.

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Thylaocephala的新种，Eodorocaris keithflinti n.gen.，n.sp.，来自美国伊利诺伊州的Mazon Creek Lagerstätte（约307 Ma）和其他Mazon克里克袋形目动物的重新描述

胸腺是真节肢动物门中一个神秘的类群。胸腺指骨只有在古生代和中生代化石中才为人所知，其特征是一种特殊的解剖结构：一个突出的折叠盾牌包裹着身体的大部分，大型复眼，三对大型的，可能是猛禽附肢，以及一个有8-22个粗壮节段的躯干，躯干上有游动附肢。然而，胸腺的生活方式和系统发育关系在很大程度上仍然未知。这项研究的重点是马宗溪Lagerstätte（约307 Ma，宾夕法尼亚中期，石炭纪）的袋形目动物。从马宗溪的菱铁矿结核中描述了一个新物种：Eodollocaris keithflinti n.gen.，n.sp.。该新物种一方面表现出古生代物种和中生代物种的典型特征。此外，还为来自同一地区的已知物种提供了附属物和树干的新细节，即Concavicaris georgerum Schram，1990和Convexicaris mazonesis Schram，90。这些新信息有助于更好地了解这些胸腺代表可能的生活方式。

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来源期刊

Geodiversitas 地学-古生物学

CiteScore

3.00

自引率

5.60%

发文量

审稿时长

>12 weeks

期刊介绍： Geodiversitas is a fully electronic journal, with a continuous publication stream, devoted to varied aspects of Earth Sciences. It publishes original results particularly on systematics, phylogeny, paleobiodiversity and paleoenvironment. Thematic issues may also be published under the responsibility of a guest editor.