Yimaia
| Yimaia Temporal range:
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|---|---|
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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
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 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