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Dacrycarpus cupressiformis
Taxonomy
Dacrycarpus cupressiformis was named by Wells and Hill (1989) [Type locality. Lower mudstone unit, Little Rapid River.
Specimens examined. LRR2-023, 024.]. It is considered to be a form taxon. Its type specimen is Holotype. LRR2-023, Department of Plant Science, University of Tasmania., a sterile axis (Cuticle), and it is a compression fossil. Its type locality is Little Rapid River 2, which is in an Oligocene lacustrine mudstone/sandstone in Australia.
Synonymy list
| Year | Name and author |
|---|---|
| 1989 | Dacrycarpus cupressiformis Wells and Hill p. 403 figs. 40-43 |
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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.
†Dacrycarpus cupressiformis Wells and Hill 1989
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| P. M. Wells and R. S. Hill 1989 | Foliage uniform, spirally arranged. Leaves bifacial, decurrent, keeled, imbricate, appressed, elongate scales, 0.9-1.3 mm long, 0.4-0.5 mm wide. Apex basically rounded but sometimes with a small point slightly incurved. Margin entire. Cuticle amphistomatic.
Stomata in four zones extending from base almost to apex on both surfaces on either side of stomata-free midregion. Zones comprising 4-5 short uniseriate rows rarely more than 6 stomata long and separated by 1-2 epidermal cells. Stornatal complex amphicyclic, rounded in outline, polar and lateral subsidiary cells distinct. Polar subsidiary cells 2, often shared between stomata of a row, square to rectangular, granular periclinal walls, smooth, thin anticlinal walls; lateral subsidiary cells 2, often bisected, crescent-shaped, periclinal wall granular, anticlinal wall smooth, thin. Guard cell cuticular flange elongate with polar extensions continuous with short lateral extensions. Florin ring distinct, sunken. Epidermal cells rectangular, in parallel longitudinal rows, forming narrow zone across midregions. Anticlinal walls thin, smooth, basically straight; periclinal wall flat, granular. |
Measurements
No measurements are available
No ecological data are available
Age range: Late/Upper Oligocene or 27.30000 to 23.04000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Oligocene | Australia (Tasmania) | Dacrycarpus cupressiformis (type locality: 167317) |