| Basic info | Taxonomic history | Classification | Included Taxa |
| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Cercidiphyllum obtritum
Taxonomy
Populus obtrita was named by Dawson (1890). It is not extant. Its type locality is North Fork of Similkameen River, which is in a Ypresian lacustrine shale/siltstone in the Allenby Formation of Canada.
It was recombined as Cercidiphyllum obtritum by Wolfe and Wehr (1987).
It was recombined as Cercidiphyllum obtritum by Wolfe and Wehr (1987).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1890 | Populus obtrita Dawson |
| 1919 | Populus obtrita Knowlton |
| 1987 | Cercidiphyllum obtritum Wolfe and Wehr p. 12 |
Is something missing? Join the Paleobiology Database and enter the data
|
|
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.
†Cercidiphyllum obtritum Dawson 1890
show all | hide all
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. A. Wolfe and W. Wehr 1987 | Leaves simple; shape symmetrical; form very wide ovate; apex rounded to obtuse; base typically shallowly cordate to truncate; margin serrate, apical angle acute, serration type A-l to B-l, sinuses rounded to angular, spacing regular, teeth simple and with small apical glands; petiole normal, at least 4 cm long; primary venation actinodromous (basal to atypically suprabasal), per- fect, reticulate, typically two strong and one weak pairs, midrib moderate, straight; first pair of lateral primaries curving smoothly or forking, extending at least three-fourths or more the distance to apex, typically slightly converging with medial secondary veins; second pair of lateral primaries curving smoothly, extending about one-third the distance to the apex, parallel to abmedial branches of first pair of primary veins; typically three pairs of medial second- ary veins, three to five pairs of abmedial branches of first pair of primary veins, and two to four pairs of abmedial branches of second pair of primary veins; all lateral primary veins, secondary veins, and abmedial branches diverging at about 45° to their respective primary; angularly eucamptodromous; intersecondaries present; axillary bracing between mid- rib and first lateral primaries formed by tertiaries that are orthogonal to acute to midrib and orthogonal to laterals, and that form abmedially oriented chevrons; other intercostal tertiaries orthogonal, widely and irregularly spaced, forming a coarse reticulum; quaternaries orthogonal, forming a reticulum of three to five areas per tertiary area; quaternaries forming a quadrangular to pentagonal reticulum of areoles, about four to five areoles per fourth-order area; veinlets branching two or more times; typically at least two series of complete marginal loops; teeth entered medially to apically by veins of quaternary rank, flanked by weak accessory veins converging at apex of tooth (chloranthoid type). |
Measurements
No measurements are available
|
|||||
|
|
||||
| Source: p = phylum | |||||
| Reference: Kiessling 2009 | |||||
Collections (3 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Ypresian | Canada (British Columbia) | Populus obtrita (121046) | |
| Lutetian - Bartonian | USA (Washington) | Cercidiphyllum obtritum (11537 11538) |