Dicroidium

Dicroidium Temporal range: Triassic PreЄ Є O S D C P T J K Pg N
Scientific classification
Kingdom:	Plantae
Division:	Gymnospermopsida
Order:	Pteridospermales
Family:	Corystospermaceae
Genus:	Dicroidium Gothan (1912)
Species
See text

Dicroidium is an extinct genus of fork-leaved seed ferns that were distributed over Gondwana during the Triassic (251 to 200 million years ago). Their fossils are known from South Africa, Australia, New Zealand, South America and Antarctica. They were first discovered in Triassic sediments of Tasmania by Morris in 1845.^[1]

Description

The leaves were essentially like those of modern ferns however they were forked; giving the appearance of two fern leaves joined at the base. It seems that they were deciduous trees. These plants had male and female reproductive structures. Before awareness that they belonged to the same species, male pollen-bearing specimens were named Pteruchus and the female structures Umkomasia.^[2]

Species

• Dicroidium crassinervis
• Dicroidium coriaceum, South Africa
• Dicroidium dubium
• Dicroidium elongatum, Australia
• Dicroidium odontopteroides
• Dicroidium spinifolium
• Dicroidium stelznerianum, Argentina, New Zealand^[3]
• Dicroidium zuberi, Antarctica, Australia and South Africa.
• Dicroidium sp. A.

References

1. ^ http://www.qm.qld.gov.au/organisation/e_prints/mqm_52_2/52_2_Anderson-et-al.pdf
2. ^ http://www.fossilmuseum.net/plantfossils/Umkomasia/Umkomasia.htm
3. ^ Journal of the Royal Society of New Zealand, March 1985

• Bomfleur, B. and Kerp, H. (2010). Dicroidium diversity in the Upper Triassic of north Victoria Land, East Antarctica.

This paleobotany-related article is a stub. You can help Wikipedia by expanding it.v · Categories: Prehistoric plants Triassic life Paleobotany stubs Wikimedia Foundation. 2010. Игры ⚽ Нужен реферат? Dicrognophos Dicrosema Look at other dictionaries: Corystospermales — Zeitraum Trias bis Kreide Fundorte vorwiegend Gondwana Systematik ohne Rang: Charophyta Reich: Pf …   Deutsch Wikipedia Triassic Period — Interval of geologic time, с 248–206 million years ago, that marks the beginning of the Mesozoic Era. Many new vertebrates emerged during the Triassic, heralding the major changes that were to occur in both terrestrial and marine life forms… …   Universalium Geologic time scale — This clock representation shows some of the major units of geological time and definitive events of Earth history. The Hadean eon represents the time before fossil record of life on Earth; its upper boundary is now regarded as 4.0 Ga.[1] Other… …   Wikipedia Permian–Triassic extinction event — …   Wikipedia Detailed logarithmic timeline — Main article: logarithmic timeline This timeline allows one to see the whole history of the universe, the Earth, and mankind in one table. Each row is defined in years ago, that is, years before the present date, with the earliest times at the… …   Wikipedia Lystrosaurus — Taxobox name = Lystrosaurus image width = 250px image caption = Lystrosaurus murrayi skeleton, Muséum national d histoire naturelle, Paris fossil range = Early Triassic regnum = Animalia phylum = Chordata classis = Synapsida ordo = Therapsida… …   Wikipedia Alpine Trias — < Perm | T r i a s | Jura > vor 251–199,6 Millionen Jahren Atmosphärischer O2 Anteil (Durchschnitt über Periodendauer) ca. 16 Vol %[1] (80 % des heutigen Niveaus) …   Deutsch Wikipedia Mitteltrias — < Perm | T r i a s | Jura > vor 251–199,6 Millionen Jahren Atmosphärischer O2 Anteil (Durchschnitt über Periodendauer) ca. 16 Vol %[1] (80 % des heutigen Niveaus) …   Deutsch Wikipedia Mittlere Trias — < Perm | T r i a s | Jura > vor 251–199,6 Millionen Jahren Atmosphärischer O2 Anteil (Durchschnitt über Periodendauer) ca. 16 Vol %[1] (80 % des heutigen Niveaus) …   Deutsch Wikipedia Obere Trias — < Perm | T r i a s | Jura > vor 251–199,6 Millionen Jahren Atmosphärischer O2 Anteil (Durchschnitt über Periodendauer) ca. 16 Vol %[1] (80 % des heutigen Niveaus) …   Deutsch Wikipedia 18+ © Academic, 2000-2024 Contact us: Technical Support, Advertising Dictionaries export, created on PHP, Joomla, Drupal, WordPress, MODx. Mark and share Search through all dictionaries Translate… Search Internet Share the article and excerpts Direct link … Do a right-click on the link above and select “Copy Link”