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Dacrycarpus linearis
Taxonomy
Dacrycarpus linearis was named by Wells and Hill (1989) [Type locality. Bottom mudstone unit, Little Rapid River.
Specimens examined. LRR1-241, 242, LRR2-05 1, 052, 053.
]. It is considered to be a form taxon. Its type specimen is Holotype. LRR2-051, 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.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1989 | Dacrycarpus linearis Wells and Hill p. 404 figs. 44-49 |
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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 linearis Wells and Hill 1989
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| P. M. Wells and R. S. Hill 1989 | Leaves long, slender, decurrent, spreading, strongly keeled, acicular to bilateral needles 4-8 mm long, 0.3-0.5 mm wide. Apex acute, straight. Margin entire. Cuticle with two full length stomatal zones on adaxial surface at least, zones may be wide, comprising 3-5 discontinuous, merging or ordered uniseriate stomatal rows, separated by 1-3 epidermal cells. Stomatal complex ovate, mostly amphicyclic; polar subsidiary cells often shared between the stomata of a row. Subsidiary cells regularly arranged, polar cells 2, rounded or square, anticlinal walls smooth, thin, periclinal wall slightly granular; lateral subsidiary cells 2, occasionally bisected, anticlinal walls thin, smooth, periclinal wall slightly granular and inclined towards hollow corresponding with the outer Florin ring. Guard cell cuticular flange rectangular in outline, with polar extensions and possibly lateral extensions. Florin ring usually distinct, smooth, rounded. Stomatal pore rounded, 8-10 μm long, 5-6 μm wide. Epidermal cells narrow, rectangular, arranged in longitudinal files, shorter within stomatiferous zones, anticlinal walls thin, smooth, basically straight; periclinal walls granular. |
Measurements
No measurements are available
No ecological data are available
Age range: base of the Early/Lower Oligocene to the top of the Late/Upper Oligocene or 33.90000 to 23.04000 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Early/Lower Oligocene | Australia (Tasmania) | Dacrycarpus linearis (166705) | |
| Late/Upper Oligocene | Australia (Tasmania) | Dacrycarpus linearis (type locality: 167317) |