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New Jurassic protocycadalean ovuliphores and the origins of the Cycadales
| Content Provider | Birbal Sahni Institute of Paleobotany |
|---|---|
| Author | Krassilov, Valentin A. Doludenko, Maya P. |
| Abstract | Ovuliferous spikes with two lateral rows of ovules are described from the Callovian of Georgia. The ovules are large, orthotropous, oblique to the stout rachis, with a scar of subtending bract at the base. They show a relatively thin integument and a bulky nucellus topped by a broad nucellar beak. This find constitutes a new genus Baruligyna gen. nov. closely related to the previously described Semionogyna Krassilov et Bugdaeva from the Lower Cretaceous of Transbaikalia. Both are associated with pteridosperm-like foliage. In the case of Baruligyna, the associated leaves are of a Pachypteris morphotype, bipinnate with thick leatherypinnules similar to the ovules in shape and dimensions. This group of Mesozoic plants is considered as transitional between the Permian callipterids and the Mesozoic cycads indicating the origin of Cycas-type ovuliphores ("macrosporophylls") form planated bracteate strobili. |
| Starting Page | 83 |
| Ending Page | 89 |
| File Format | |
| Volume Number | 53 |
| Language | English |
| Publisher Date | 2004-01-01 |
| Access Restriction | Open |
| Subject Keyword | Cycadales Jurassic Plant Morphology Phylogeny |
| Content Type | Text |
| Educational Use | Research Reading |
| Resource Type | Article |
| Education Level | Under Graduate Post Graduate |
| Subject | Paleobotany; fossil microorganisms |
