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| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Araucaria prominens
Taxonomy
Araucaria prominens was named by Hill (1990). It is not extant. It is considered to be a form taxon. Its type specimen is M-661.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1990 | Araucaria prominens Hill pp. 217-218 figs. 20-25 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Araucaria prominens Hill 1990
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. S. Hill 1990 | Leaf arrangement on axis unknown. Leaf 5 mm long, <2mm wide, distinctly keeled, apex acute, incurving, adaxial surface concave. Stomatal distribution unknown. Stomatal plug with a fused, irregular, highly extruded surface. Subsidiary cells usually four, sometimes five or six. Guard cells level with epidermal cells, subsidiary cells extend below them. Cuticle on subsidiary cells granular, outer flange oval, regular, rim unthickened. Flange between guard and subsidiary cells often extended into an irregular fringe, less well developed at guard cell poles. Polar extensions well developed. Flange between guard cells smooth and thick. Cuticle on guard cell surface smooth. Epidermal cell walls not sinuous, buttressing absent. |
Measurements
No measurements are available
No ecological data are available
Age range: base of the Late/Upper Oligocene to the top of the Early/Lower Miocene or 27.30000 to 15.98000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Oligocene - Early/Lower Miocene | Australia (Tasmania) | Araucaria prominens (167314) |