A new genus and species of eurypterid (Chelicerata, Eurypterida) from the Lower Devonian Xiaxishancun Formation of Yunnan, southwestern China

IF 1.6 4区地球科学 Q2 PALEONTOLOGY Geobios Pub Date : 2022-12-01 DOI:10.1016/j.geobios.2022.09.001

Jiashu Wang , Lu Liu , Jinzhuang Xue , James C. Lamsdell , Paul A. Selden

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引用次数: 1

Abstract

Eurypterids constituted an important component of Paleozoic marine ecosystems, but their fossil record has been mainly reported from North America and Europe, and the evolution of this group in other regions such as East Asia remains poorly understood. A new eurypterid, Malongia mirabilis nov. gen., nov. sp., is described from the Lower Devonian (Lochkovian) Xiaxishancun Formation of Qujing, Yunnan, southwestern China. The holotype shows a ventral prosoma with appendages II–VI and part of the opisthosoma. The characters indicating a dolichopterid affinity of the new taxon include: metastoma anterior cordate and basally truncated; appendage III bearing multiple enlarged spines; appendage V nonspiniferous; long appendage VI with expanded distal podomere and narrow triangular VI-7a; subrhomboidal coxa of appendage VI with a rounded principal tooth. Malongia nov. gen. is the fourth genus described within the Dolichopteridae Kjellesvig-Waering and Størmer, 1952, other members of which are Dolichopterus Hall, 1859, Clarkeipterus Kjellesvig-Waering, 1966, and Ruedemannipterus Kjellesvig-Waering, 1966; it represents the only record of this family in South China.

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标题云南下泥盆统下西山村组泛蝶纲一新属、新种(Chelicerata，泛蝶纲)

泛蝶类是古生代海洋生态系统的重要组成部分，但其化石记录主要来自北美和欧洲，在东亚等其他地区的演化情况尚不清楚。云南曲靖下泥盆统(Lochkovian)下西山村组发现一种新的泛翅类Malongia mirabilis nov. gen.， nov. sp.。整型图显示腹侧的前体细胞，附肢II-VI和部分胸腹体。表明新分类群具有多翼类亲和性的特征包括:转移瘤前心形和基部截断;附属物III具有多个扩大的刺;附属物V无刺;长附属物VI具扩张的远端足节和狭窄的三角形VI-7a;附属物VI的近菱形的髋具一圆形的主齿。Malongia nov. gen.是Dolichopteridae和Størmer(1952)中描述的第四个属，其他成员有Dolichopterus Hall (1859)， Clarkeipterus kjellesvigg - waering(1966)和Ruedemannipterus kjellesvigg - waering (1966);它是这个家族在华南地区的唯一记录。

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来源期刊

Geobios 地学-古生物学

CiteScore

3.30

自引率

6.20%

发文量

审稿时长

6-12 weeks

期刊介绍： Geobios publishes bimonthly in English original peer-reviewed articles of international interest in any area of paleontology, paleobiology, paleoecology, paleobiogeography, (bio)stratigraphy and biogeochemistry. All taxonomic groups are treated, including microfossils, invertebrates, plants, vertebrates and ichnofossils. Geobios welcomes descriptive papers based on original material (e.g. large Systematic Paleontology works), as well as more analytically and/or methodologically oriented papers, provided they offer strong and significant biochronological/biostratigraphical, paleobiogeographical, paleobiological and/or phylogenetic new insights and perspectices. A high priority level is given to synchronic and/or diachronic studies based on multi- or inter-disciplinary approaches mixing various fields of Earth and Life Sciences. Works based on extant data are also considered, provided they offer significant insights into geological-time studies.