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Dacrycarpus crenulatus

Coniferales - Podocarpaceae

Taxonomy
Dacrycarpus crenulatus was named by Wells and Hill (1989) [Type locality. Pioneer tin mine, Pioneer. Specimens examined. P-221, 222, 231, 251, 252, 261, 881, 882.]. It is considered to be a form taxon. Its type specimen is P-221, Department of Plant Science, University of Tasmania., a sterile axis (Cuticle), and it is a compression fossil.

Synonymy list
YearName and author
1989Dacrycarpus crenulatus Wells and Hill p. 401 figs. 35-37

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RankNameAuthor
kingdomPlantae
phylumSpermatophyta
phylumPinophyta
orderConiferales
RankNameAuthor
familyPodocarpaceaeEndlicher 1847
genusDacrycarpusde Laubenfels 1969
speciescrenulatus

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 crenulatus Wells and Hill 1989
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Diagnosis
ReferenceDiagnosis
P. M. Wells and R. S. Hill 1989Foliage spirally arranged, leaves bifacial, decurrent, strongly keeled, loosely imbricate, short falcate to linear needles 1-1.8 mm long, 0.2-0.4 mm wide. Apex acute, incurved. Margin entire. Cuticle amphistomatic; stomata in four distinct zones, two either side of stomata-free area across midvein on both leaf surfaces; zones nearly extending to apex on adaxial surface, but only 1/2 leaf length on abaxial surface. Stomata in ordered uniseriate rows; rows 2-3 per band, often in contact, occasionally separated by 1-2 epidermal cells near band margin. Stomata rounded, amphicyclic with polar encircling cells usually missing, lateral encircling cells usually in contact with polar and lateral subsidiary cells; polar subsidiary cells 2, often shared between adjacent stomata of a row, round in outline, anticlinal walls deeper than those of epidermal cells, periclinal walls smooth; lateral subsidiary cells 2 sometimes divided to give 3, crescent-shaped, periclinal wall distinctly grooved and inclined downwards to meet cuticular flange of guard cell, outer anticlinal wall sometimes frill-like or crenate due to continuation of grooves from the periclinal wall. Cuticular flange between guard cells and subsidiary cells extensively developed with prominent lateral flaps and polar extensions. Stomata1 pore elongate 8-16 pm x 2.5-4.5 pm. Florin ring indistinct, sunken. Epidermal cells narrow, rectangular, arranged in longitudinal files, shorter in stomatiferous regions, periclinal walls granular, anticlinal walls smooth, deep, strongly pitted.
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 28.40000 to 15.97000 Ma

Collections: one only


Time interval Ma Country or state Original ID and collection number
Late/Upper Oligocene - Early/Lower Miocene28.4 - 15.97Australia (Tasmania) Dacrycarpus crenulatus (166703)