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.
journal_name
Am J Botjournal_title
American journal of botanyauthors
Leslie AB,Glasspool I,Herendeen PS,Ichinnorov N,Knopf P,Takahashi M,Crane PRdoi
10.3732/ajb.1300173subject
Has Abstractpub_date
2013-12-01 00:00:00pages
2426-36issue
12eissn
0002-9122issn
1537-2197pii
ajb.1300173journal_volume
100pub_type
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journal_title:American journal of botany
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更新日期:2011-11-01 00:00:00
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doi:
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