Dicroidium

Dicroidium is an extinct genus of fork-leaved seed ferns that were distributed over Gondwana during the Triassic (252 to 201 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, Brasil in Paleorrota geopark.^[3]
• Dicroidium spinifolium
• Dicroidium stelznerianum, Argentina, New Zealand^[4]
• Dicroidium zuberi, Antarctica, Australia, South Africa and Brasil in Paleorrota geopark.^[5]
• Dicroidium sp. A.

References

1. ↑ http://www.qm.qld.gov.au/~/media/Documents/QM/About%20Us/Publications/Memoirs%20-%20Nature/N52-2/52-2-anderson-et-al.pdf
2. ↑ http://www.fossilmuseum.net/plantfossils/Umkomasia/Umkomasia.htm
3. ↑ THE TRIASSIC TAPHOFLORA FROM PARANA BASIN, SOUTHERN BRAZIL
4. ↑ Journal of the Royal Society of New Zealand, March 1985
5. ↑ Passo das Tropas, Santa Maria, RS Marco bioestratigráfico triássico na evolução paleoflorística do Gondwana na Bacia do Paraná.

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

v t e Fauna and Flora of Paleorrota Geopark Rio Grande do Sul Fauna Aetosaurs Stagonolepis Archosaurs Barberenachampsa nodosa Barberenasuchus brasiliensis Cerritosaurus Chanaresuchus Decuriasuchus Fitossauros Karamuru vorax Prestosuchus chiniquensis Procerosuchus Proterochampsa nodosa Protorosaurus Rauisuchus tiradentes Rhadinosuchus gracilis Spondylosoma Teyumbaita sulcognathus Teyuwasu Cynodonts Belesodon magnificus Brasilitherium Brasilodon Candelariodon Chiniquodon Charruodon Tetracuspidatus Exaeretodon riograndensis Gomphodontosuchus Brasiliensis Irajatherium hernadezi Luangwa Massetognathus Menadon Minicynodon Protheriodon estudianti Protuberum cabralensis Prozostrodon brasiliensis Riograndia Santacruzodon hopsoni Therioherpeton cargnini Traversodon Stahleckeri Dicynodonts Dinodontosaurus pedroanum Dinodontosaurus turpior Jachaleria candelariensis Stahleckeria Trucidocynodon Dinosaurs Staurikosaurus Guaibasaurus Pampadromaeus Sacisaurus Saturnalia tupiniquim Unaysaurus Mesosaurus Mesosaurus Pareiasaurus Provelosaurus brasiliensis Procolophons Candelaria barbouri Procolophon brasiliensis Procolophon pricei Procolophon trigoniceps Rhynchosaurs Hyperodapedon huenei Hyperodapedon mariensis Hyperodapedon sanjuanensis Temnospondylis Bageherpeton longignathus Sangaia lavinai Stereospondyli Insects Sanctipaulus mendesi Others Clevosaurus brasiliensis Dinocephalians Pampaphoneus biccai Soturnia caliodon Tiarajudens eccentricus Paleorrota's Flag. Dinotchê: The mascot Paleorrota. Flora Lycophytas Brasilodendron pedroanum Cyclodendron sp. Pteridospermatophytas Dicroidium odontopteroides Dicroidium zuberi Pteridophytas Asterotheca sp. Botrychiopsis plantianum Botrychiopsis valida Neomariopteris sp. Osmundites brasiliensis Pecopteris sp. Stephanophyllites sp. Sphenophytas Phyllotheca brevifolia Phyllotheca longifolia Sphenopteris sp. Neocalamites sp. Glossopteris Gangamopteris obovata Gangamopteris sulriograndensis Glossopteris angustifolia Glossopteris. brasiliensis Glossopteris browniana Glossopteris communisi Glossopteris indica Glossopteris occidentalis Cordaites Cordaites hislopii Kawizophyllum sp. Ginkgophytas Baieroxylon cicatricum Cheirophyllum speculare Chiropteris sp. Ginkgoites antarctica Sphenobaiera sp. Conifers Brachyphyllum sp. Buriadia sp. Cordaicarpus brasilianus Cordaicarpus cerronegrensisi Cordaicarpus fanatinensis Cordaicarpus truncata Coricladus quiteriensis Kaokoxylon zalesskyi Pagiophyllum sp. Samaropsis gigas Samaropsis kurtzii Samaropsis millaniana Samaropsis rigbyi Samaropsis seixasi Sommerxylon spiralosus Bennettitales Nilssonia sp. Williamsonia sp.