Newly discovered morphology of the Silurian sea spider Haliestes and its implications

IF 2.3 2区地球科学 Q1 PALEONTOLOGY

Papers in Palaeontology Pub Date : 2023-09-01 DOI:10.1002/spp2.1528

Derek J. Siveter, Romain Sabroux, Derek E. G. Briggs, David J. Siveter, Mark D. Sutton

引用次数: 1

Abstract

Abstract The three‐dimensionally preserved Haliestes dasos from the Silurian (Wenlock) Lagerstätte is the most complete fossil sea spider and the oldest unambiguous pycnogonid known from the fossil record. The discovery of two new specimens to add to the holotype reveals new features including proximal annulations of the appendages and segmentation of the trunk end, critical details for comparison with pycnogonids from the Devonian (Emsian) Hunsrück Slate and for the interpretation of the evolutionary significance of Palaeozoic genera. There is some evidence of sexual dimorphism. Haliestes dasos was nektobenthic and its morphology indicates an unusual mode of feeding compared with living pycnogonids. The new morphological features of H. dasos are closely similar to those in Palaeoisopus problematicus from the Hunsrück Slate and it clearly belongs, together with that species, in stem Pycnogonida and not the crown group.

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志留纪海蜘蛛haaliestes的新发现及其意义

来自志留纪(Wenlock) Lagerstätte的三维保存的haaliestes dasos是化石记录中最完整的海蜘蛛化石，也是最古老的明确的海蜘蛛。两个新标本的发现揭示了新的特征，包括附属物的近端环和躯干末端的分割，与泥盆纪(Emsian) hunsrck板岩的pycnogonids进行比较的关键细节，以及对古生代属的进化意义的解释。有一些证据表明存在性别二态性。haaliestes dasos是一种底栖动物，它的形态与现存的pynogonids相比表明了一种不同寻常的摄食方式。h . dasos紧密的新形态特性类似于古等足蛛属problematicus从Hunsruck石板,显然属于物种一起,在茎Pycnogonida而不是皇冠集团。

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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.