Biology:Pseudobornia

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Short description: Extinct genus of ferns

Pseudobornia
Temporal range: Late Devonian[1]
Pseudobornia ursina.jpg
Pseudobornia ursina
Scientific classification edit
Kingdom: Plantae
Clade: Tracheophytes
Division: Polypodiophyta
Class: Polypodiopsida
Subclass: Equisetidae
Order: Pseudoborniales
Genus: Pseudobornia
Nathorst.
Species:
P. ursina
Binomial name
Pseudobornia ursina
Nathorst.

Pseudobornia is a genus of plants known only from fossils found from the Upper Devonian.[1] It contains a single species Pseudobornia ursina, and is the earliest fossil assigned with certainty to the Equisetopsida.

The first fossils of Pseudobornia were collected by Johan Gunnar Andersson on Bear Island in the 1890s.[2] Hans-Joachim Schweitzer, a paleobotanist, was the first to interpret the fossils as belonging to a large tree, based on additional fossils discovered in Alaska in the 1960s.[3][4]

The probable relationships within Equisetidae are shown in the cladogram below. The position where Ibyka would be has been added.[5]

Ibyka(?)

Pseudobornia ursina

Sphenophyllales

Archeocalamitaceae

Calamitaceae

Equisetaceae

References

  1. 1.0 1.1 Taylor, Thomas N.; Edith L. Taylor. (1993). The Biology and Evolution of Fossil Plants. Englewood Cliffs, NJ: Prentice Hall. pp. 305–307. ISBN 0-13-651589-4. 
  2. "Paleontology: World's First Tall Tree". Time. June 16, 1967. 
  3. Schweitzer, H.-J. (1967). "Die Oberdevon-Flora der Bäreninsel I. Pseudobornia ursina Nathorst.". Palaeontographica 120B: 116–137. 
  4. Schweitzer, H.-J. (1967). "Ein Riesenschachtelhalm aus dem Oberdevon, Pseudobornia ursina". Umschau in Wissenschaft und Technik 6: 196. 
  5. "Introduction to the Sphenophyta". University of California Museum of Paleontology. http://www.ucmp.berkeley.edu/plants/sphenophyta/sphenophyta.html. 

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