已灭绝的荚果属植物 Podocarpium Braun ex Stizenberger 的 "印度境外 "扩散

IF 1.7 3区 地球科学 Q2 PALEONTOLOGY
Ashif Ali, Robert A. Spicer, Raman Patel, Rajendra Singh Rana, Mahasin Ali Khan
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引用次数: 0

摘要

是已灭绝的著名单籽豆科植物属,在新生代化石中广泛分布于东亚到中欧地区。迄今为止,包括印度在内的南亚地区还没有该属的化石记录。在这里,我们首次报告并描述了来自印度西部拉贾斯坦邦早始新世的一个保存完好的豆荚化石。它的特点是:不对称的斜瓣、单粒长圆形种子、明显弯曲的柄、无翅的边缘、沿背缝突出的维管束(吻合到先端)、弱弯曲的腹缝、细网状脉、短渐尖的先端和狭锐的基部。这一发现是迄今为止世界上有记录的最古老的化石证据。结合之前的化石记录,我们提出了 "印度境外 "扩散假说,以解释这一已灭绝豆科植物属的生物地理学。它可能起源于印度(南亚)始新世早期温暖潮湿的热带气候条件下,然后迁移到中国(东亚),随后向北和向西传播到欧洲。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
“Out-of-India” dispersal of the extinct fabaceous genus Podocarpium Braun ex Stizenberger
is a well-known extinct single-seeded legume genus having extensive Cenozoic fossil occurrences from East Asia to central Europe. To date, there have been no fossil records of this genus from South Asia, including India. Here, we report and describe for the first time a well-preserved fossil pod from the early Eocene of Rajasthan, western India, assigned to extinct based on detailed morphology. It is characterized by an asymmetrical, oblique valve with a single oblong seed, a distinctly curved stipe, a wingless margin, a prominent vascular strand along the dorsal suture that anastomoses into the apex, a weakly curved ventral suture, fine reticulate veins, a short acuminate apex, and a narrowly acute base. This discovery is the oldest fossil evidence of recorded to date worldwide. Together with previous fossil records, we suggest an “Out-of-India” dispersal hypothesis to explain the biogeography of this extinct legume genus. It might have originated under warm and humid tropical climate conditions in the early Eocene of India (South Asia), then migrated to China (East Asia), and subsequently spread north and westward to Europe.
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来源期刊
Palaeoworld
Palaeoworld PALEONTOLOGY-
CiteScore
4.00
自引率
5.90%
发文量
95
期刊介绍: Palaeoworld is a peer-reviewed quarterly journal dedicated to the study of past life and its environment. We encourage submission of original manuscripts on all aspects of palaeontology and stratigraphy, comparisons of regional and global data in time and space, and results generated by interdisciplinary investigations in related fields. Some issues will be devoted entirely to a special theme whereas others will be composed of contributed articles. Palaeoworld is dedicated to serving a broad spectrum of geoscientists and palaeobiologists as well as serving as a resource for students in fields as diverse as palaeobiology, evolutionary biology, taxonomy and phylogeny, geobiology, historical geology, and palaeoenvironment. Palaeoworld publishes original articles in the following areas: •Phylogeny and taxonomic studies of all fossil groups •Biostratigraphy, chemostratigraphy, chronostratigraphy •Palaeoecology, palaeoenvironment and global changes throughout Earth history •Tempo and mode of biological evolution •Biological events in Earth history (e.g., extinctions, radiations) •Ecosystem evolution •Geobiology and molecular palaeobiology •Palaeontological and stratigraphic methods •Interdisciplinary studies focusing on fossils and strata
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