Huvenia

Huvenia
Temporal range: Early Devonian
Scientific classification
Kingdom: Plantae
Subkingdom: Embryophyta
Clade: Polysporangiophyta
Division: Tracheophyta
Class: †Rhyniopsida
Genus: †Huvenia
Hass & W.Remy (1991)[1]
Species
  • H. kleui Hass & W.Remy (1991)

Huvenia is a genus of extinct plants of the Early Devonian (Pragian or Siegenian stage, around 411 to 408 million years ago), found in slate deposits of the Rhenish Massif.[1] The sporophyte generation consisted of leafless stems (axes), which appear to be flattened, and which branch dichotomously. The strand of conducting tissue contains simple tracheids, making this a vascular plant (tracheophyte). The sporangia (spore-forming organs) are borne on the ends of short branching stems (sporangiophores) rather than terminating main stems as in some other early land plants. Sporangia appear to be twisted, but it is not clear whether this feature was present in life or developed after death.[2]

In 2004, Crane et al. published a cladogram for the polysporangiophytes, in which Huvenia is placed in the Rhyniaceae.[3] (See that article for the cladogram.)

References

  1. 1 2 Hass, H. & Remy, W. (1991), "Huvenia kleui nov. gen., nov. spec.—ein Vertreter der Rhyniaceae aus dem höheren Siegen des Rheinischen Schiefergebirges", Argumenta Palaeobotanica 8: 141–168
  2. ↑ Taylor, T.N.; Taylor, E.L. & Krings, M. (2009), Paleobotany : The Biology and Evolution of Fossil Plants (2nd ed.), Amsterdam; Boston: Academic Press, ISBN 978-0-12-373972-8, p. 250
  3. ↑ Crane, P.R.; Herendeen, P. & Friis, E.M. (2004), "Fossils and plant phylogeny", American Journal of Botany 91 (10): 1683–99, doi:10.3732/ajb.91.10.1683, PMID 21652317, retrieved 2011-01-27
This article is issued from Wikipedia - version of the Thursday, April 30, 2015. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.