Biology:Yimaia
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Short description: Extinct genus of seed-bearing plants
| Yimaia | |
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| Restoration of Yimaia recurva from 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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Yimaia is an extinct genus of Ginkgoalean tree, and the only member of the family Yimaiaceae. In botanical form classification, its a form taxon for ginkgoalean ovulate organs. Yimaia species are distinguished from other Ginkgoales by the presence of "Ovulate organs consisting of a peduncle and 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 either Baiera or Ginkgoites leaf morphospecies.[1] Fossils have been found in Middle Jurassic deposits in China .
Species
- Yimaia capituliformis Zhou, Zheng and Zhang, 2006 Daohugou Bed, China, Callovian[2] Associated with leaves of Ginkgoites type
- Yimaia qinghaiensis Wu, Yang and Zhou, 2006 Shimengou Formation, Qinghai, China, Middle Jurassic[3] Associated with leaves of Baiera furcata type.
- Yimaia recurva (type) Zhou et Zhang, 1988 Yima Formation, Henan, China, Middle Jurassic
References
- ↑ Zhou, Zhi-Yan (March 2009). "An overview of fossil Ginkgoales" (in en). Palaeoworld 18 (1): 1–22. doi:10.1016/j.palwor.2009.01.001. https://linkinghub.elsevier.com/retrieve/pii/S1871174X0900002X.
- ↑ Zhou, Zhiyan; Zheng, Shaolin; Zhang, Lijun (April 2007). "Morphology and age of Yimaia (Ginkgoales) from Daohugou Village, Ningcheng, Inner Mongolia, China" (in en). Cretaceous Research 28 (2): 348–362. doi:10.1016/j.cretres.2006.05.004. https://linkinghub.elsevier.com/retrieve/pii/S0195667106000930.
- ↑ 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" (in en). Review of Palaeobotany and Palynology 138 (3–4): 209–225. doi:10.1016/j.revpalbo.2006.01.009. https://linkinghub.elsevier.com/retrieve/pii/S0034666706000236.
Wikidata ☰ Q2600332 entry
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