Re-investigation of the Mesozoic cycad genus Chilinia: Fossil record, diversity, spatio-temporal distribution, and palaeoclimate implications

IF 1.9 3区地球科学 Q1 GEOLOGY

Cretaceous Research Pub Date : 2024-05-07 DOI:10.1016/j.cretres.2024.105920

Mengge Li , Yongdong Wang , Ya Li , Yanbin Zhu

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Abstract

Chilinia is an extinct genus of cycads, established by Li and Ye in 1964 based on leaf fossils from the Lower Cretaceous in Jilin Province, China. Morphologically, the genus Chilinia closely resembles Ctenis, another cycad foliage genus, in having pinnately divided leaves with laterally inserted pinnae on the rachis and reticulate venation but differs mainly from the latter in having toothed or irregularly lobed rather than entire-margined pinnae. Fossil records show that up to now, nine species of Chilinia have been reported worldwide, representing an index fossil plant in the Jurassic to Early Cretaceous. In this study, we present a comprehensive overview of all reported Chilinia fossils from a systematic palaeobotanical perspective. Fossil records indicate that Chilinia mainly occurred in the middle–high latitudes of the northern and southern hemispheres in Pangea from the Middle Jurassic to Middle Cretaceous. Combined evidence from the morphology of Chilinia and its floral patterns suggests that the genus probably lived in humid warm-temperate palaeoclimatic conditions with brief seasonal variations.

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中生代苏铁属Chilinia的再调查：化石记录、多样性、时空分布和古气候影响

奇楠属是已灭绝的苏铁属，由李和叶于 1964 年根据中国吉林省下白垩统的叶化石建立。从形态上看，Chilinia 属与另一个苏铁叶属 Ctenis 非常相似，都具有羽状分裂的叶片，叶轴上有侧向插入的羽片和网状脉，但与后者的主要区别在于后者具有齿状或不规则浅裂的羽片，而不是全缘的羽片。化石记录显示，到目前为止，全世界已报道了 9 种 Chilinia，代表了侏罗纪至早白垩世的一种指数化石植物。在本研究中，我们从系统的古植物学角度全面概述了所有报道的 Chilinia 化石。化石记录表明，侏罗纪中期至白垩纪中期，Chilinia主要分布在南北半球潘加大陆的中高纬度地区。Chilinia 的形态及其花卉模式的综合证据表明，该属可能生活在潮湿暖温带古气候条件下，并有短暂的季节性变化。

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

Cretaceous Research 地学-地质学

CiteScore

4.10

自引率

19.00%

发文量

235

审稿时长

12 weeks

期刊介绍： Cretaceous Research provides a forum for the rapid publication of research on all aspects of the Cretaceous Period, including its boundaries with the Jurassic and Palaeogene. Authoritative papers reporting detailed investigations of Cretaceous stratigraphy and palaeontology, studies of regional geology, and reviews of recently published books are complemented by short communications of significant new findings. Papers submitted to Cretaceous Research should place the research in a broad context, with emphasis placed towards our better understanding of the Cretaceous, that are therefore of interest to the diverse, international readership of the journal. Full length papers that focus solely on a local theme or area will not be accepted for publication; authors of short communications are encouraged to discuss how their findings are of relevance to the Cretaceous on a broad scale. Research Areas include: • Regional geology • Stratigraphy and palaeontology • Palaeobiology • Palaeobiogeography • Palaeoceanography • Palaeoclimatology • Evolutionary Palaeoecology • Geochronology • Global events.