Yimaia
| Yimaia Temporal range:
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| Restoration ofYimaia recurvafrom the Jurassic of China | |
Scientific classification
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| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Gymnospermae |
| Division: | Ginkgophyta |
| Class: | Ginkgoopsida |
| Order: | Ginkgoales |
| Family: | †Yimaiaceae Zhou, 1997 |
| Genus: | †Yimaia Zhou et Zhang, 1988 |
| Species | |
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Yimaiais an extinct genus ofGinkgoaleantree, and theonly memberof the familyYimaiaceae.In botanicalform classification,its aform taxonfor ginkgoaleanovulateorgans.Yimaiaspecies are distinguished from other Ginkgoales by the presence of "Ovulate organs consisting of apeduncleand up to eight or nine terminal, sessile, contiguous and orthotropous (straight, upright and with a micropyle at apex) ovules. "The ovules are associated with leaves of eitherBaieraorGinkgoitesleaf morphospecies.[1]Fossils have been found inMiddle Jurassicdeposits inChina.
Species
[edit]- Yimaia capituliformisZhou, Zheng and Zhang, 2006Daohugou Bed,China,Callovian[2]Associated with leaves ofGinkgoitestype
- Yimaia qinghaiensisWu, Yang and Zhou, 2006Shimengou Formation,Qinghai,China,Middle Jurassic[3]Associated with leaves ofBaiera furcatatype.
- Yimaia recurva(type)Zhou et Zhang, 1988Yima Formation,Henan,China,Middle Jurassic
References
[edit]- ^Zhou, Zhi-Yan (March 2009)."An overview of fossil Ginkgoales".Palaeoworld.18(1): 1–22.doi:10.1016/j.palwor.2009.01.001.
- ^Zhou, Zhiyan; Zheng, Shaolin; Zhang, Lijun (April 2007)."Morphology and age of Yimaia (Ginkgoales) from Daohugou Village, Ningcheng, Inner Mongolia, China".Cretaceous Research.28(2): 348–362.doi:10.1016/j.cretres.2006.05.004.
- ^Wu, Xiangwu; Yang, Xiaoju; Zhou, Zhiyan (April 2006)."Ginkgoalean ovulate organs and seeds associated with Baiera furcata-type leaves from the Middle Jurassic of Qinghai Province, China".Review of Palaeobotany and Palynology.138(3–4): 209–225.doi:10.1016/j.revpalbo.2006.01.009.