Pinaceae-like reproductive morphology in Schizolepidopsis canicularis sp. nov. from the Early Cretaceous (Aptian-Albian) of Mongolia

Andrew B. Leslie, Ian Glasspool, Patrick S. Herendeen, Niiden Ichinnorov, Patrick Knopf, Masamichi Takahashi, Peter R. Crane

Research output: Contribution to journalArticle

16 Scopus citations

Abstract

Premise of the study: Seed cone scales assigned to the genus Schizolepidopsis are widespread in Late Triassic to Cretaceous Eurasian deposits. They have been linked to the conifer family Pinaceae based on associated vegetative remains, but their exact affinities are uncertain. Recently discovered material from the Early Cretaceous of Mongolia reveals important new information concerning Schizolepidopsis cone scales and seeds, and provides support for a relationship between the genus and extant Pinaceae. Methods: Specimens were collected from Early Cretaceous (probable Aptian-Albian) lignite deposits in central Mongolia. Lignite samples were disaggregated, cleaned in hydrofluoric acid, and washed in water. Specimens were selected for further study using light and electron microscopy. Key results: Schizolepidopsis canicularis seed cones consist of loosely arranged, bilobed ovulate scales subtended by a small bract. A single inverted seed with an elongate micropyle is borne on each lobe of the ovulate scale. Each seed has a wing formed by the separation of the adaxial surface of the ovulate scale. Conclusions: Schizolepidopsis canicularis produced winged seeds that formed in a manner that is unique to Pinaceae among extant conifers. We do not definitively place this species in Pinaceae pending more complete information concerning its pollen cones and vegetative remains. Nevertheless, this material suggests that Schizolepidopsis may be important for understanding the early evolution of Pinaceae, and may potentially help reconcile the appearance of the family in the fossil record with results based on phylogenetic analyses of molecular data.

Original languageEnglish (US)
Pages (from-to)2426-2436
Number of pages11
JournalAmerican Journal of Botany
Volume100
Issue number12
DOIs
StatePublished - Dec 1 2013

Keywords

  • Conifer
  • Pinaceae
  • Seed plant phylogeny
  • Seed wing

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Genetics
  • Plant Science

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    Leslie, A. B., Glasspool, I., Herendeen, P. S., Ichinnorov, N., Knopf, P., Takahashi, M., & Crane, P. R. (2013). Pinaceae-like reproductive morphology in Schizolepidopsis canicularis sp. nov. from the Early Cretaceous (Aptian-Albian) of Mongolia. American Journal of Botany, 100(12), 2426-2436. https://doi.org/10.3732/ajb.1300173