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| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Dacrycarpus involutus
Taxonomy
Dacrycarpus involutus was named by Wells and Hill (1989) [Type locality. Mudstone lens, cutting, Monpeelyata canal.
Specimens examined. M-232, 237, 243, 244, 2023, 2024.]. It is considered to be a form taxon. Its type specimen is Holotype. M-2023, Department of Plant Science, University of Tasmania., a sterile axis (Cuticle), and it is a compression fossil.
Synonymy list
| Year | Name and author |
|---|---|
| 1989 | Dacrycarpus involutus Wells and Hill p. 393 fig. 8,9,12,13 |
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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 involutus 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, imbricate, appressed to loosely spreading, strongly keeled, decurrent, elongate scales 2.5 (2.0-3.0) mm long, 0.8 (0.7-0.9) mm wide at widest point. Leaves strongly tapering from widest point, base slightly constricted. Apex acute, curved inward. Margins entire. Cuticle epistomatic, stomata in two zones near base of adaxial surface, either side of stomata free midvein. Stomata in short ordered uniseriate rows parallel to long axis of leaf, stomatal zones 3-4 rows wide, polar subsidiary cells normally shared between adjacent stomata of row, lateral subsidiary cells commonly in contact between rows, sometimes shared. Guard cells completely enclosed by cutin envelope with distinct T-shaped polar extensions. Stomata1 pore elongate, orientation parallel to leaf axis; Florin ring indistinct, smooth. Epidermal cells outside stomatal zones elongated, forming long narrow parallelograms arranged in rows parallel to stomatal rows. Within stomatal zones epidermal cells less elongated with thinner anticlinal walls. Adaxial surface epidermal cells with thin, smooth, slightly beaded anticlinal walls (<2.5 µm), abaxial epidermal cells with thicker buttressed anticlinal walls, 4-6 µm thick. |
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) | Dacrycarpus involutus (167314) |