Fertile Woodwardia from the middle Eocene of South China and its implications for palaeogeography and palaeoclimate.
Fertile Woodwardia from the middle Eocene of South China and its implications for palaeogeography and palaeoclimate.
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华南始新世中期肥沃的狗脊及其古地理和古气候的意义
DOI：
10.1016/j.pld.2021.09.003
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发表时间：
2022-11
期刊：
影响因子：
4.8
通讯作者：
Jin, Jian-Hua
中科院分区：
文献类型：
--
作者：
Song, Han-Zhang;V. Naugolnykh, Serge;Wu, Xin-Kai;Liu, Xiao-Yan;Jin, Jian-Hua
木耳属(Woodwardia)与木耳属(Anchistea)和木耳属(Lorseria)一起构成了木犀亚科(Woodwardioideae)，分布于中美、北美、欧洲和亚洲温带至热带地区。伍德沃迪亚的化石记录遍及北美、欧洲和亚洲的古近纪和新近纪。然而，保存完好的该属可育羽片化石在中国南部尚未见报道。本文记述了一新种--W.exchangchangensis NauGolnykh et Song，sp.11月系描述自海南岛南部长昌盆地始新世中期的中国。可育羽片的宏观形态和显微形态特征为：羽轴笔直，羽片互生，近三角形，尖端锐尖，小羽片边缘几乎全缘或稍有波状，长卵球形孢子囊，柄孢子囊和表面有翼状褶皱的孢子，这些特征都很详细。总体而言，目前的化石与现存物种日本木兰最相似，后者大多生长在温暖潮湿的环境中。这一新种在海南岛长昌盆地的发现表明，该属早在始新世中期就已分布在中国南部的低纬热带地区。根据这一发现，结合前人对同一地点其他蕨类植物的研究，我们推断，在长昌组沉积期间，古海南地貌的气候是温暖潮湿的，与今天该地区普遍存在的条件相似。本文记述的海南岛始新世的伍德沃迪亚化石是首次发现于中国南部。昌木是为数不多的具有微形态特征的化石之一。早在始新世中期，中国南部就出现了伍德沃迪亚。始新世中期，长昌盆地古气候温暖湿润。
The genus Woodwardia, which together with the genera Anchistea and Lorinseria comprise the subfamily Woodwardioideae of Blechnaceae, has a disjunct distribution across Central and North America, Europe and the temperate to tropical areas of Asia. Fossil records of Woodwardia occur throughout the Paleogene and Neogene of North America, Europe and Asia. However, well-preserved fertile pinna fossils of this genus have not yet been reported in South China. In this paper, a new species, W. changchangensis Naugolnykh et Song, sp. nov. is described from the middle Eocene of the Changchang Basin, Hainan Island, South China. Macromorphological and micromorphological features of the fertile pinna show a straight pinna rachis, alternate, subtriangular pinnules, acute pinnule apices, almost entire or slightly undulate pinnule margins, long-ovoid sori, stalked sporangia and spores with wing-like folds on the surface, which are characterised in detail. Overall, the present fossil is most similar to the extant species Woodwardia japonica, which mostly grows in warm and moist environments. The discovery of this new species from the Changchang Basin of Hainan Island indicates that this genus has been distributed in the low-latitude tropical regions of South China from as early as the middle Eocene. Based on this find, and previous studies of other ferns from the same site, we infer that the climate of the Palaeo-Hainan landscape during deposition of the Changchang Formation was warm and humid, similar to conditions prevailing today across this region. The fossil Woodwardia described here from the Eocene of Hainan Island is the first from South China. Woodwardia changchangensis is one of few fossils with described micromorphological features. Woodwardia occurred in South China as early as the middle Eocene. Paleoclimate of Changchang Basin was warm and humid during the middle Eocene.
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影响因子：
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影响因子：
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