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Craspedodromophyllum acutum
Taxonomy
Craspedodromophyllum acutum was named by Crane (1981). Its type specimen is V.59801a, a leaf, and it is a compression fossil. Its type locality is Cold Ash Quarry, which is in a Paleocene fluvial claystone/siltstone in the United Kingdom. It is the type species of Craspedodromophyllum.
Synonymy list
| Year | Name and author |
|---|---|
| 1981 | Craspedodromophyllum acutum Crane |
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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.
†Craspedodromophyllum acutum Crane 1981
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| P.R. Crane 1981 | Leaves elliptic to narrowly elliptic, 40–150 mm long and 10–50 mm wide. Base acute, apex attenuate. Petiole proximally dilated, up to 26 mm in length. Secondary veins arising from the midrib alternately in 12–16 pairs, rarely opposite. Angle of divergence 15–(25–35)–60 degrees. Distance between secondary veins measured at the midrib 1–(4–11)–17 mm decreasing apically. Origin of lowermost secondary vein supra-basal. Basal veins, thin, of tertiary order, occasionally proximally contiguous with the margin. Tertiary venation percurrent, alternate, rarely opposite; straight to slightly convex, branched and unbranched. Mid-vein, tertiary angle 85–(95–110)–120 degrees. Quarternary venation orthogonal forming irregular polygonal areolae. |
Measurements
No measurements are available
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| Source: p = phylum | |||||
| Reference: Kiessling 2009 | |||||
Age range: Late/Upper Paleocene or 59.24000 to 56.00000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Paleocene | United Kingdom (Berkshire) | Craspedodromophyllum acutum (type locality: 234638) |