First occurrence of family Clavatoraceae (fossil Charophyta) in the Middle Jurassic (Bathonian) of France

IF 2.3 2区地球科学 Q1 PALEONTOLOGY

Papers in Palaeontology Pub Date : 2024-03-15 DOI:10.1002/spp2.1548

Khaled Trabelsi, Benjamin Sames, Carles Martín‐Closas

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Abstract

A rich and diverse charophyte flora is described from the Bathonian marginal marine beds of southern France. It includes nine species that belong to the families Porocharaceae, Characeae and Clavatoraceae: Porochara gr. fusca, P. gr. kimmeridgensis subgr. kimmeridgensis, P. gr. kimmeridgensis subgr. westerbeckensis, P. gr. kimmeridgensis subgr. douzensis, P. gr. kimmeridgensis subgr. obovata, Auerbachichara saidakovskyi, A. tataouinensis, Aclistochara mädleri and Echinochara cf. peckii. This is the most diverse Middle Jurassic flora reported from France and Laurasia to date, elucidating a turnover in the evolution of charophytes during this time interval. The occurrence of the clavatoracean Echinochara cf. peckii in these Bathonian deposits represents the oldest record of the genus and of the whole family, c. 10 myr older than previous records. This species is considered to be the most basal species in the phylogeny of Clavatoraceae and during its evolutionary history reached a wide biogeographical range in Laurasia. The new Bathonian charophyte assemblage from southern France provides supplementary evidence that the Middle Jurassic was a reactivation pulse in the Mesozoic evolution of charophytes, rather than a stasis as previously thought. Moreover, it provides further support to the hypothesis that during the Late Jurassic and Early Cretaceous the islands of the Cretaceous Tethyan Archipelago represented one of the most active spots of charophyte diversity.

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法国中侏罗世（巴特翁纪）首次出现化石石莲花科植物

本报告描述了法国南部巴吞纪边缘海床丰富多样的石莲花植物群。其中包括属于 Porochara 科、Characeae 科和 Clavatoraceae 科的 9 个物种：Porochara gr. fusca、P. gr. kimmeridgensis subgr.kimmeridgensis subgr. obovata、Auerbachichara saidakovskyi、A. tataouinensis、Aclistochara mädleri 和 Echinochara cf. peckii。这是迄今为止从法国和劳拉西亚报告的最多样化的中侏罗世植物群，阐明了这一时期叶绿体演化的更替。在这些巴斯顿沉积物中出现的栉水母（Echinochara cf. peckii）代表了该属乃至整个科的最古老记录，比之前的记录早约 10 百万年。该物种被认为是腔肠动物科系统发育中最基干的物种，在其进化史中曾到达过劳拉西亚广泛的生物地理范围。新发现的法国南部巴斯顿时期的叶绿体集合体提供了补充证据，证明中侏罗世是叶绿体中生代演化的重新活跃期，而不是之前认为的停滞期。此外，它还进一步支持了这样一种假设，即在晚侏罗世和早白垩世，白垩纪特提安群岛的岛屿是叶绿体多样性最活跃的地方之一。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.