Early Cretaceous Umkomasia from Mongolia: Implications for homology of corystosperm cupules

Gongle Shi*, Andrew B. Leslie, Patrick S. Herendeen, Fabiany Herrera, Niiden Ichinnorov, Masamichi Takahashi, Patrick Knopf, Peter R. Crane

*Corresponding author for this work

Research output: Contribution to journalArticle

22 Scopus citations

Abstract

Corystosperms, a key extinct group of Late Permian to Early Cretaceous plants, are important for understanding seed plant phylogeny, including the evolution of the angiosperm carpel and anatropous bitegmic ovule. Here, we describe a new species of corystosperm seed-bearing organ, Umkomasia mongolica sp. nov., based on hundreds of three-dimensionally preserved mesofossils from the Early Cretaceous of Mongolia. Individual seed-bearing units of U. mongolica consist of a bract subtending an axis that bifurcates, with each fork (cupule stalk) bearing a cupule near the tip. Each cupule is formed by the strongly reflexed cupule stalk and two lateral flaps that partially enclose an erect seed. The seed is borne at, or close to, the tip of the reflexed cupule stalk, with the micropyle oriented towards the stalk base. The corystosperm cupule is generally interpreted as a modified leaf that bears a seed on its abaxial surface. However, U. mongolica suggests that an earlier interpretation, in which the seed is borne directly on an axis (shoot), is equally likely. The 'axial' interpretation suggests a possible relationship of corystosperms to Ginkgo. It also suggests that the cupules of corystosperms may be less distinct from those of Caytonia than has previously been supposed.

Original languageEnglish (US)
Pages (from-to)1418-1429
Number of pages12
JournalNew Phytologist
Volume210
Issue number4
DOIs
StatePublished - Jun 1 2016

Keywords

  • Corystosperms
  • Early Cretaceous
  • Homology
  • Mongolia
  • Seed
  • Seed ferns

ASJC Scopus subject areas

  • Physiology
  • Plant Science

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    Shi, G., Leslie, A. B., Herendeen, P. S., Herrera, F., Ichinnorov, N., Takahashi, M., Knopf, P., & Crane, P. R. (2016). Early Cretaceous Umkomasia from Mongolia: Implications for homology of corystosperm cupules. New Phytologist, 210(4), 1418-1429. https://doi.org/10.1111/nph.13871