Description of Acheronauta gen. nov., a possible mandibulate from the Silurian Waukesha Lagerstätte, Wisconsin, USA

IF 2.2 2区地球科学 Q3 EVOLUTIONARY BIOLOGY Journal of Systematic Palaeontology Pub Date : 2022-10-10 DOI:10.1080/14772019.2022.2109216

M. Pulsipher, Evan P. Anderson, Lauren S. Wright, J. Kluessendorf, D. Mikulic, J. Schiffbauer

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引用次数: 4

Abstract

The Silurian Waukesha Lagerstätte of Wisconsin, USA, hosts a fauna of distinctive soft-bodied organisms, including a range of graptolites, worms, trilobites and uncommon arthropods, but otherwise lacks most of the shelly fauna typical of contemporaneous deposits. While several species have been described, much of the Waukesha biota remains understudied. Here, we examine numerous specimens of a previously unnamed and undescribed vermiform arthropod that bears a cephalic carapace, a suite of specialized head appendages, a long, segmented trunk, and a battery of small swimming appendages. The taxonomic and phylogenetic evaluations presented herein establish this taxon as a novel genus and species, Acheronauta stimulapis gen. et sp. nov., plausibly positioned within the basal mandibulates. Our phylogenetic analyses suggest that a new arthropod clade may be warranted, comprising Acheronauta gen. nov., Captopodus, and the thylacocephalans. https://zoobank.org/urn:lsid:zoobank.org:pub:B572831B-1A8A-4E4E-9258-34D91AA22A74nk

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Acheronauta gen. nov.的描述，可能来自志留纪Waukesha Lagerstätte，美国威斯康星州

美国威斯康星州的志留系Waukesha Lagerstätte拥有一系列独特的软体生物，包括一系列笔石、蠕虫、三叶虫和罕见的节肢动物，但在其他方面缺乏同期沉积物中典型的大多数有壳动物群。虽然已经描述了几个物种，但沃克沙生物群的大部分仍然研究不足。在这里，我们检查了一种以前未命名和未描述的蠕虫节肢动物的大量标本，这种节肢动物有头甲、一套特殊的头部附肢、一个长的分节躯干和一组小型游泳附肢。本文提供的分类学和系统发育评估将该分类单元确定为一个新属和新物种，Acheronauta stimulapis gen.et sp.nov.，似乎位于下颌基部。我们的系统发育分析表明，可能有必要建立一个新的节肢动物分支，包括Acheronauta gen.nov.、Captopodus和袋形目。https://zoobank.org/urn:lsid:zoobank.org:pub:B572831B-1A8A-4E4E9258-34D91A22A74nk

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来源期刊

Journal of Systematic Palaeontology 地学-古生物学

CiteScore

5.30

自引率

7.70%

发文量

审稿时长

>12 weeks

期刊介绍： The Journal of Systematic Palaeontology publishes papers that provide novel and impactful results in phylogenetics and systematics and that use these results in ways that significantly advance rigorous analyses of palaeogeography, palaeobiology, functional morphology, palaeoecology or biostratigraphy. Papers dealing with theoretical issues or molecular phylogenetics are also considered if they are of relevance to palaeo-systematists. Contributions that include substantial anatomical descriptions, descriptions of new taxa or taxonomic revisions are welcome, but must also include a substantial systematics component, such as a new phylogeny or a revised higher-level classification. Papers dealing primarily with alpha-taxonomic descriptions, the presentation of new faunal/floristic records or minor revisions to species- or genus-level classifications do not fall within the remit of the journal.