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Polymorphopteris mei
Polymorphopteris mei D.-D. Li, W.-M. Zhou, J. Hilton, Jun Wang bis in D.-D. Li, W.-M. Zhou, T. Clem., J. Hilton, S.-Jun Wang, Y.-F. Wu, W.-J. Sun, Jun Wang bis Historical Biol., 2026, (10.1080/08912963.2025.2605723): 3. 12 Jan 2026
- Name
- Polymorphopteris mei
- Rank
- Species
- Generic Name
- [Genus] Polymorphopteris
- Authors (Name)
- Li D.-D.
Zhou W.-M.
Hilton J.
Wang J.
- Authors (Pub.)
- Li D.-D.
Zhou W.-M.
Clements T.
Hilton J.
Wang S.-J.
Wu Y.-F.
Sun W.-J.
Wang J.
- Publication
- Frond reconstruction of Polymorphopteris mei sp. nov. from the early Permian Wuda Tuff Flora with insights into its taphonomy [2026/1]
- Journal
- Historical biology
- Annee/Jahrgang
- 2026
- Issue
- 10.1080/08912963.2025.2605723
- Page number
- 3
- Year
- 2026
- Fossil Status
- foliage
- Stratigraphy
- Asselian
- Strat. comment
- uppermost Taiyuan Formation
- Location
- Wuda Coalfield, Inner Mongolia, China
- Paleoregion
- Cathaysia (North)
Data for Holotypus
- Repository
- Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, China
- Repository Number
- PB208855
Data for Paratypus
- Repository
- Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, China
- Repository Number
- PB208856, PB208857, PB208858
- Diagnosis
- Frond tripinnate. Penultimate pinnae alternate and lanceolate. Penultimate pinnae composed of fully dissected ultimate pinnae (UP1), partially dissected ultimate pinnae (UP2), undissected ultimate pinnae (UP3), and pinnules. UP1 lanceolate, apex acute; UP2 and UP3 ligulate, apex obtuse. Pinnules linguiform, margins parallel, apex obtuse, base contracted into a cordate base. All pinnae and pinnules dorsiventral. Midvein stout and straight. The primary lateral vein once-forked near midvein into two secondaries, each twice (rarely three times) dichotomous along outer 1/3–1/2, yielding four
tertiary laterals. Rachis anatomy of the stewartiopterid pattern. Vascular bundle endarch, metaxylem tracheids with scalariform thickenings. The vascular bundle of frond rachis C-shaped with two laterally involute to revolute ends, of penultimate rachis C-shaped to linear.
