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| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Knightiophyllum wilcoxianum
Taxonomy
Knightiophyllum wilcoxianum is a species.
Synonymy list
| Year | Name and author |
|---|---|
| 1919 | Knightiophyllum wilcoxianum Knowlton |
| 1969 | Knightiophyllum wilcoxianum Dilcher and Mehrotra |
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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.
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D. L. Dilcher and B. Mehrotra 1969 | Leaves elongate-ovate and conspicuously dentate. Leaf blade length varies from 4.6-14 cm and width from 1.6-4.7 cm; it is widest at or slightly below the middle but occasionally is widest near the base and it tapers gradually to an obtusely pointed apex -one retuse apex was found- and more abruptly to an acuminate or obtuse, sightly inequilateral base. The petioles are rarely as long or stout as those Berry (1916) found (2 mm x 4 cm) but are 0.7-3 cm long, generally measuring about 0.5 mm x 2 cm, and are smaller at the point of leaf attachment. The margins are entire near the base; above the base there are irregularly spaced, large (0.5-2 mm), recurved, outward pointing, blunt teeth which are smaller and more rounded near the apex. The fine venation is very characteristic in the fossil material. The midrib is stout with slightly irregularly spaced secondary veins arising from it at angles varying from 45 to 70 degrees (generally 5--60 degrees) and extending 2/3 or 3/4 the distance to the margin before bending upwards and joining the secondary above to form a camptodrome vantion pattern. The prominent secondary veins do not extend into the teeth, but small tertiary veins arising from the marginal loops of the secondary veins do extend into the teeth. Numerous small tertiary veins also arise directly from the midrib between the somewhat stouter irregularly spaced secondary veins. When the fine venation was well preserved the ultimate venation was observed to be closed, with the ultimate veins forming areolae. |
Measurements
No measurements are available
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| Source: p = phylum | |||||
| Reference: Kiessling 2009 | |||||
Age range: Middle Eocene or 48.07000 to 37.71000 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Middle Eocene | USA (Tennessee) | Knightiophyllum wilcoxianum (31696 31705) |