Nilssoniaceae
| Rank | Taxon |
|---|---|
| Kingdom | Plantae |
| Division | Cycadophyta |
| Class | Cycadopsida |
| Order | Nilssoniales |
| Family | Nilssoniaceae |
| Genera | Nilssonia, Beania, Androstrobus |
Nilssoniaceae is an extinct family of fossil plants known from the Triassic, Jurassic, and Cretaceous periods. The family is characterised by cycad-like leaves and distinctive reproductive structures, and is generally regarded as part of the broader cycad lineage, although some authors place it in a separate order, Nilssoniales. Fossils of Nilssoniaceae are widespread and provide important evidence for the diversity of gymnosperm plants during the Mesozoic. [1]
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Description
Members of Nilssoniaceae are known primarily from fossilised leaves and reproductive organs. The leaves are typically pinnate, with parallel venation, and closely resemble those of modern cycads. Reproductive structures attributed to the family include seed-bearing and pollen-producing organs that differ in form from those of extant cycads. [2][not in citation given]
Distribution
Fossils attributed to Nilssoniaceae have been reported from Europe, Asia, Australia, and the Americas. This broad geographic distribution indicates that the family was widespread during the Mesozoic era. [3]
Significance
Nilssoniaceae is significant in studies of fossil gymnosperms because it illustrates morphological diversity among cycad-like plants prior to the rise of flowering plants. The family contributes to understanding the evolutionary history of seed plants during the Mesozoic. [4]
References
- ↑ Taylor, T. N., Taylor, E. L., & Krings, M. (2009). Paleobotany: The Biology and Evolution of Fossil Plants. Academic Press.
- ↑ Stewart, W. N. & Rothwell, G. W. (1993). Paleobotany and the Evolution of Plants. Cambridge University Press.
- ↑ Cleal, C. J. & Rees, P. M. (2003). "The distribution of Mesozoic gymnosperms." Palaeogeography, Palaeoclimatology, Palaeoecology.
- ↑ Taylor, T. N., Taylor, E. L., & Krings, M. (2009). Paleobotany: The Biology and Evolution of Fossil Plants. Academic Press.
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