Biology:Yimaia

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Short description: Extinct genus of seed-bearing plants

Yimaia
Temporal range: Middle Jurassic
Yimaia recurva.jpg
Restoration of Yimaia recurva from the Jurassic of China
Scientific classification e
Kingdom: Plantae
Clade: Tracheophytes
Clade: Gymnospermae
Division: Ginkgophyta
Class: Ginkgoopsida
Order: Ginkgoales
Family: Yimaiaceae
Zhou, 1997
Genus: Yimaia
Zhou et Zhang, 1988
Species
  • Yimaia capituliformis Zhou, Zheng and Zhang, 2006
  • Yimaia qinghaiensis Wu, Yang and Zhou, 2006
  • Yimaia recurva (type) Zhou et Zhang, 1988

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

Wikidata ☰ Q2600332 entry