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Dacrydium sinuosum
Taxonomy
Dacrydium sinuosum was named by Wells and Hill (1989) [Type locality. Pioneer tin mine, Pioneer.
Specimens examined. P-262, 631.]. It is considered to be a form taxon. Its type specimen is Holotype. P-631, Department of Plant Science, University of Tasmania., a leaf (Cuticle), and it is a compression fossil. Its type locality is Pioneer - tin mine, which is in an Oligocene/Miocene alluvial fan claystone in Australia.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1989 | Dacrydium sinuosum Wells and Hill p. 408 figs. 57-60 |
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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.
†Dacrydium sinuosum Wells and Hill 1989
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| P. M. Wells and R. S. Hill 1989 | Leaves uniform, short, decurrent, strongly keeled, loosely imbricate needles, 2-25 mm long, 0.35-0.6 mm wide. Apex acute, straight or slightly inwardly curved. Margin entire. Cuticle amphistomatic; stomata in four distinct zones, two either side of stomata-free midvein; adaxial stomatal zones narrow, extending from base to just below apex; abaxial zones very narrow, extremely short, occurring at base of leaf only; zones composed of 2-3 ordered, uniseriate rows rarely separated by more than one epidermal cell. Stomata1 complex rounded, amphicyclic, polar encircling cells missing. Subsidiary cells compact, regularly arranged; polar subsidiary cells 2, varying outline, anticlinal walls usually buttressed, periclinal walls smooth; lateral subsidiary cells 2, sometimes bisected, periclinal wall smooth, sloping downward towards hollow formed by Florin ring, anticlinal wall thin, smooth. Guard cell cuticular flange rectangular with prominent polar extensions, but little or no lateral extension development. Epidermal cells narrow, rectangular, arranged in parallel longitudinal files between stomatal zones, irregular within stomatal zones; anticlinal walls thick, strongly buttressed giving distinctly sinuous appearance on both adaxial and abaxial surfaces, slightly thinner on adaxial surface; periclinal walls smooth. Florin ring prominent on outer epidermal surface, sometimes double-ringed, level with surface or sunken. Stomatal pore elongate 16(12-18) μm long, 3.5(3-4) μm wide. |
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) | Dacrydium sinuosum (type locality: 166703) |