| Basic info | Taxonomic history | Classification | Included Taxa |
| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Pterophyllum trichomatosum
Taxonomy
Pterophyllum trichomatosum 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 | Pterophyllum trichomatosum 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.
†Pterophyllum trichomatosum Villar de Seoane 2001
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| L. Villar de Seoane 2001 | Pinnae alternate, elongated and distally falcate, up to 1.9 cm long and 0.4 cm wide, with entire margins and acute apex. Veins entering parallel from the attachment region with a concentration of four per 1 mm. Adaxial epidermis smooth with rectangular to isodiametric cells 59 m long and 27 m wide. Very sinuous walls. Abaxial epidermis densely ornamented with simple papillae and hairs. Rectangular to isodiametric epidermal cells 65 m long and 28 m wide, also with very sinuous walls.
Leaves hypostomatic. Paracytic stomatal apparatus 57 m long and 62 m wide, each subsidiary cell with a marginal papilla. Ultrastructure of external wall of the epidermis consists of an upper layer 0.40 m thick; a middle layer 3.50 m thick; and a lower layer 0.40 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 132.90000 to 125.00000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Hauterivian - Barremian | Argentina (Santa Cruz) | Pterophyllum trichomatosum (153088) |