منابع مشابه
Cycad Anatomy and Fossil Occurrences in Texas
ycadophyta presently consists of the living order Cycadales, which is comprised of three families worldwide. In the Mesozoic, cycads were represented by the Cycadales, plus another large order, Cycadeoidales (also referred to as Bennettitales). Cycadophyta is thought to have evolved from the Paleozoic seed ferns (pteridosperms), as did conifers, and eventually, angiosperms. However, Cycadales a...
متن کاملCycad revoluta toxicosis in a dog
A 3-year-old female Cocker Spaniel dog acutely developed hepatopathy following ingestion of root of Cycad (Cycas revoluta). Seven hours after the ingestion, she showed acute continuous nausea, vomiting, and marked depression and was presented to the local veterinary clinic. At physical evaluation, the dog showed moderate weakness, pale mucous membrane, jaundice, and dehydration. Serum biochemic...
متن کاملEvolutionary developmental biology in cycad phenology
We recently described lack of phenotypic plasticity in reproductive organ development and substantial plasticity in vegetative organ development for the cycad Cycas micronesica. Is there an evo-devo explanation for the disparity in phenotypic plasticity of vegetative vs. reproductive organs? Despite modularity, might evolution of cycad phenology be controlled more by drift than selection?
متن کاملLeaf anatomy of a late Palaeozoic cycad
Today, cycads are a small group of gymnospermous plants with a limited distribution in the (sub)tropics, but they were major constituents of Mesozoic floras. Fossil leaves sporadically found in latest Carboniferous and Permian floras have putatively been ascribed to cycads. However, their true affinity remains unclear due to the lack of anatomical evidence. Virtually all modern cycads have pinn...
متن کاملUni-leaflet mitral valve.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . doi:10.1093/ejechocard/jer027 Online publish-ahead-...
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ژورنال
عنوان ژورنال: South African Journal of Botany
سال: 2012
ISSN: 0254-6299
DOI: 10.1016/j.sajb.2012.02.008