Coryphoid palms from the K-Pg boundary of central India and their biogeographical implications: Evidence from megafossil remains

IF 4.6 1区生物学 Q1 PLANT SCIENCES

Plant Diversity Pub Date : 2023-01-01 DOI:10.1016/j.pld.2022.01.001

Sanchita Kumar , Taposhi Hazra , Robert A. Spicer , Manoshi Hazra , Teresa E.V. Spicer , Subir Bera , Mahasin Ali Khan

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引用次数: 2

Abstract

Ten palm leaf impressions are documented from the latest Maastrichtian (late Cretaceous) to early Danian (earliest Paleocene) sediments (K-Pg, c. 66–64 Ma) of the Mandla Lobe of the Deccan Inter-trappean Beds, Madhya Pradesh, central India. The palmate leaf shape along with a definite well-preserved costa support their placement in the subfamily Coryphoideae of the family Arecaceae. We place all recovered palm leaf specimens in the fossil genus Sabalites, report seven species of coryphoid palms and describe two new species namely, Sabalities umariaensis sp. nov. and Sabalites ghughuaensis sp. nov. The fossils indicate that coryphoid palms were highly diverse in central India by the latest Cretaceous. These and earlier reported coryphoid palm fossils from the same locality indicate that they experienced a warm and humid tropical environment during the time of deposition. These discoveries confirm the presence of a diversity of Coryphoideae in Gondwana prior to the India-Eurasia collision and provide information about coryphoid biogeographical history over geological time. Based on megafossil remains, we trace coryphoid palm migration pathways from India to mainland Southeast (SE) Asia and other parts of Asia after the docking of the Indian subcontinent with Eurasia early in the Paleogene.

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来自印度中部K-Pg边界的羽状棕榈及其生物地理意义:来自巨化石遗骸的证据

从最新的马斯特里赫特阶（白垩纪晚期）到早的大丹阶（古新世早期）沉积物（K-Pg，约66–64 Ma），记录了印度中部中央邦德干Inter-trappean床Mandla Lobe的十个棕榈叶印痕。掌状的叶子形状和一个明确的、保存完好的肋支持它们在槟榔科珊瑚亚科中的地位。我们将所有回收的棕榈叶标本都放在Sabalites化石属中，报告了七种牛头狮棕榈，并描述了两个新物种，即Sabalites umariaensis sp.nov.和Sabalites ghughuaensis sp.nov。这些化石表明，到白垩纪晚期，印度中部的牛头狮手掌高度多样化。这些和早期报道的来自同一地区的头狮棕榈化石表明，它们在沉积期间经历了温暖潮湿的热带环境。这些发现证实了在印度-欧亚大陆碰撞之前，冈瓦纳大陆存在一种多样性的冠虫科，并提供了有关地质时期冠虫生物地理历史的信息。根据巨型化石遗骸，我们追踪了古近纪早期印度次大陆与欧亚大陆对接后，从印度到东南亚大陆和亚洲其他地区的冠棕迁徙路径。

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来源期刊

Plant Diversity Agricultural and Biological Sciences-Ecology, Evolution, Behavior and Systematics

CiteScore

8.30

自引率

6.20%

发文量

1863

审稿时长

35 days

期刊介绍： Plant Diversity (formerly Plant Diversity and Resources) is an international plant science journal that publishes substantial original research and review papers that advance our understanding of the past and current distribution of plants, contribute to the development of more phylogenetically accurate taxonomic classifications, present new findings on or insights into evolutionary processes and mechanisms that are of interest to the community of plant systematic and evolutionary biologists. While the focus of the journal is on biodiversity, ecology and evolution of East Asian flora, it is not limited to these topics. Applied evolutionary issues, such as climate change and conservation biology, are welcome, especially if they address conceptual problems. Theoretical papers are equally welcome. Preference is given to concise, clearly written papers focusing on precisely framed questions or hypotheses. Papers that are purely descriptive have a low chance of acceptance. Fields covered by the journal include: plant systematics and taxonomy- evolutionary developmental biology- reproductive biology- phylo- and biogeography- evolutionary ecology- population biology- conservation biology- palaeobotany- molecular evolution- comparative and evolutionary genomics- physiology- biochemistry