The early Cambrian Bushizheia yangi and head segmentation in upper stem‐group euarthropods

IF 2.3 2区地球科学 Q1 PALEONTOLOGY

Papers in Palaeontology Pub Date : 2024-05-07 DOI:10.1002/spp2.1556

Robert J. O'Flynn, Mark Williams, Mengxiao Yu, Jin Guo, Denis Audo, Michel Schmidt, Huijuan Mai, Yu Liu, Gregory D. Edgecombe

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引用次数: 0

Abstract

Bushizheia yangi O'Flynn & Liu, a euarthropod from the lower Cambrian (Series 2, Stage 3) Chengjiang Konservat‐Lagerstätte, possesses both raptorial frontal appendages sharing traits with stem‐group euarthropods, and deuteropodan characters shared by all extant euarthropods (e.g. dorsal arthrodization and arthropodization of all limbs). Microtomography of new specimens of B. yangi shows previously unknown details of head morphology: a six‐segmented head composed of an ocular segment that carries diminutive paired stalked eyes, a post‐ocular segment with deutocerebral frontal appendages, and four subsequent cephalic segments each bearing a pair of appendages. The phylogenetic position of B. yangi in the euarthropod stem‐group adds support to a six‐segmented head being an ancestral state for Deuteropoda. This study also reports the first occurrence of possible eggs closely associated with B. yangi. The homology of raptorial frontal appendages between lower stem‐group euarthropod radiodonts and deuteropods (i.e. upper stem and crown‐group euarthropods) is strengthened by similarity and phylogenetic continuity between B. yangi, its likely sister taxon Kiisortoqia soperi Stein, from the Sirius Passet Konservat‐Lagerstätte, and other euarthropod taxa.

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寒武纪早期的Bushizheia yangi和上茎类类人猿的头部分节

Bushizheia yangi O'Flynn & Liu 是下寒武统（第 2 系第 3 阶段）澄江古城遗址出土的一种超足类动物，既具有与茎类超足类动物相同的猛禽前额附肢，又具有所有现生超足类动物所共有的中足类特征（例如背侧节肢化和四肢节肢化）。扬吉虫新标本的显微层析成像显示了以前未知的头部形态细节：头部由六个节段组成，其中一个眼节带有微小的成对有柄眼睛，一个眼后节带有去大脑前额附肢，其后四个头节各带有一对附肢。B. yangi在瓣足类茎群中的系统发育位置进一步支持了六节头是瓣足类的祖先状态。本研究还首次报道了可能与B. yangi密切相关的卵。B. yangi、其可能的姊妹类群 Kiisortoqia soperi Stein（来自天狼星 Passet Konservat-Lagerstätte）及其他凹足类群之间的相似性和系统发育的连续性，加强了下茎类凹足类与氘足类（即上茎类和冠类凹足类）之间猛禽额附属物的同源性。

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来源期刊

Papers in Palaeontology PALEONTOLOGY-

CiteScore

4.50

自引率

4.30%

发文量

期刊介绍： Papers in Palaeontology is the successor to Special Papers in Palaeontology and a journal of the Palaeontological Association (www.palass.org). The journal is devoted to the publication of papers that document the diversity of past life and its distribution in time and space. Papers in Palaeontology is devoted to the publication of papers that document the diversity of past life and its distribution in time and space. As a sister publication to Palaeontology its focus is on descriptive research, including the descriptions of new taxa, systematic revisions of higher taxa, detailed biostratigraphical and biogeographical documentation, and descriptions of floras and faunas from specific localities or regions. Most contributions are expected to be less than 30 pp long but longer contributions will be considered if the material merits it, including single topic parts. The journal publishes a wide variety of papers on palaeontological topics covering: palaeozoology, palaeobotany, systematic studies, palaeoecology, micropalaeontology, palaeobiogeography, functional morphology, stratigraphy, taxonomy, taphonomy, palaeoenvironmental reconstruction, palaeoclimate analysis, biomineralization studies.