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Lagarostrobos marginatus
Taxonomy
Lagarostrobos marginatus was named by Wells and Hill (1989) [Type locality. Upper mudstone unit, Little Rapid River.
Specimens examined. LRR1-701.]. It is considered to be a form taxon. Its type specimen is Holotype. LRR1-701, Department of Plant Science, University of Tasmania., a sterile axis (Cuticle), and it is a compression fossil. Its type locality is Little Rapid River 1, which is in an Oligocene fluvial-lacustrine mudstone in Australia.
Synonymy list
| Year | Name and author |
|---|---|
| 1989 | Lagarostrobos marginatus Wells and Hill p. 411 figs. 68-71 |
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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.
†Lagarostrobos marginatus Wells and Hill 1989
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| P. M. Wells and R. S. Hill 1989 | Spiral phyllotaxy; leaves bifacial, decurrent, keeled, elongate, closely appressed, imbricate scales, 1-1.5 mm long, 0.3-0.4 mm wide. Apex acute to blunt. Margin entire. Cuticle amphistomatic; stomata arranged randomly across both leaf surfaces, stomata not always longitudinal. Small stomata-free zone along base of midvein on adaxial surface and along midvein and apical regions of abaxial surface. Stomata usually solitary, subsidiary cells rarely touching. Stomatal complex rounded, amphicyclic; subsidiary cells 4-6, only occasionally differentiated into distinct polar and lateral cells, subsidiary cell periclinal walls sometimes with discontinuous irregular cutin thickening arising from guard cell complex. Guard cell cuticular flange rectangular with no lateral extensions and only poorly developed polar extensions. Epidermal cells polygonal, randomly oriented except over lower midvein where cells are rectangular and arranged in files; anticlinal walls thin, straight or curved, periclinal walls granular. Florin ring pronounced, sunken level with leaf surface, slightly elongate, smooth. Stomatal pore 13-22 μm long, 4-6 μm wide. |
Measurements
No measurements are available
No ecological data are available
Age range: Early/Lower Oligocene or 33.90000 to 28.40000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Early/Lower Oligocene | Australia (Tasmania) | Lagarostrobos marginatus (type locality: 166705) |