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| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Ptilophyllum valvatum
Taxonomy
Ptilophyllum valvatum was named by Villar de Seoane (2001). It is not extant. It is considered to be a form taxon.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 2001 | Ptilophyllum valvatum Villar de Seoane |
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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.
†Ptilophyllum valvatum Villar de Seoane 2001
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| L. Villar de Seoane 2001 | Pinnate leaves. Pinnae alternate to subalternate, elongated and distally falcate, up to 3.3 cm long and 0.4 cm wide, with entire margins. Veins parallel, arising from the broad basal attachment. Adaxial epidermis smooth with rectangular to isodiametric cells 69.0 m long and 32.0 m wide, with strongly sinuous walls. Abaxial epidermis densely covered with compound papillae and hairs. Rectangular to isodiametric epidermal cells 66 m long and 38 m wide, with very sinuous walls. Leaves hypostomatic. Paracytic stomatal apparatus 63 m long and 50 m wide; each subsidiary cell with compound papillae. Ultrastructurally, cuticular membrane formed by an upper layer 1.0 m thick; a middle layer 3.50 m thick; and a lower layer 0.50 m thick. |
Measurements
No measurements are available
No ecological data are available
Age range: base of the Hauterivian to the top of the Barremian or 132.60000 to 121.40000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Hauterivian - Barremian | Argentina (Santa Cruz) | Ptilophyllum valvatum (153088) |