华北河北省下中新世的铁杉新化石物种--Tsuga weichangensis sp.

IF 3.7 1区 生物学 Q1 Agricultural and Biological Sciences Journal of Systematics and Evolution Pub Date : 2023-02-27 DOI:10.1111/jse.12952
Ya Li, Carole T. Gee, Zhen-Zhen Tan, Yan-Bin Zhu, Tie-Mei Yi, Cheng-Sen Li
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引用次数: 0

摘要

铁杉(Tsuga)是松科的一个小属,现存 10 个种,分布于东亚、北美东部和西部。对铁杉化石进行可靠的种级鉴定取决于能否发现具有完整苞片的球果,但这种球果在化石记录中很少见。在这里,我们根据华北河北围场下中新世保存完好、苞片几乎完整的球果,描述了铁杉的一个新化石物种--围场铁杉(T. weichangensis sp.该化石物种的特征介于 Tsuga 和 Nothotsuga 之间。魏昌T. 发达且略微外露的苞片让人联想到野葛,但其他特征,如非叶状的花序梗和舌状的苞片,以及在同一化石地点发现的单囊花粉,则表明其亲缘关系更接近于Tsuga。基于 15 个形态特征和一个分子骨架约束的支系分析支持将这些锥果化石归入津贺属而非 Nothotsuga 属,并将魏昌氏 T. 的化石种归入津贺属中一个尚未解决的多分枝结构中。Tsuga锥果化石的出现表明,围场中新世的古气候比现在温暖湿润,这与古风韵学重建的古气候一致。
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Exceptionally well-preserved seed cones of a new fossil species of hemlock, Tsuga weichangensis sp. nov. (Pinaceae), from the Lower Miocene of Hebei Province, North China

Tsuga (hemlock) is a small genus of 10 extant species in the Pinaceae, with a disjunct distribution in East Asia and eastern and western North America. Reliable species-level identification of Tsuga fossils depends on the discovery of seed cones with intact bracts, but such cones are rare in the fossil record. Here we describe a new fossil species of hemlock as T. weichangensis sp. nov. based on exquisitely preserved seed cones with nearly complete bracts from the Lower Miocene of Weichang, Hebei Province, North China. This fossil species displays a mosaic of characters between Tsuga and Nothotsuga. The well-developed and slightly exserted bract scales of T. weichangensis are reminiscent of Nothotsuga, but other characters, such as nonleaved peduncles and tongue-shaped bract scales, in addition to monosaccate pollen found at the same fossil locality, suggest an affinity closer to Tsuga. Cladistic analysis based on 15 morphological characters and a molecular backbone constraint supports the assignment of these fossil cones to Tsuga rather than Nothotsuga, and places the fossil species of T. weichangensis in an unresolved polytomy within the genus Tsuga. The occurrence of Tsuga seed cone fossils indicate the paleoclimate in the Miocene of Weichang was warmer and more humid than today's climate, which is consistent with the paleoclimate reconstructed by paleopalynology.

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来源期刊
Journal of Systematics and Evolution
Journal of Systematics and Evolution Agricultural and Biological Sciences-Ecology, Evolution, Behavior and Systematics
CiteScore
7.40
自引率
8.10%
发文量
1368
审稿时长
6-12 weeks
期刊介绍: Journal of Systematics and Evolution (JSE, since 2008; formerly Acta Phytotaxonomica Sinica) is a plant-based international journal newly dedicated to the description and understanding of the biological diversity. It covers: description of new taxa, monographic revision, phylogenetics, molecular evolution and genome evolution, evolutionary developmental biology, evolutionary ecology, population biology, conservation biology, biogeography, paleobiology, evolutionary theories, and related subjects.
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