نتایج جستجو برای: gymnosperms
تعداد نتایج: 875 فیلتر نتایج به سال:
The head and mouthpart structures of 11 species of Eurasian scorpionflies represent three extinct and closely related families during a 62-million-year interval from the late Middle Jurassic to the late Early Cretaceous. These taxa had elongate, siphonate (tubular) proboscides and fed on ovular secretions of extinct gymnosperms. Five potential ovulate host-plant taxa co-occur with these insects...
As one of the most ancient tree species, the codon usage pattern analysis of Ginkgo biloba is a useful way to understand its evolutionary and genetic mechanisms. Several studies have been conducted on angiosperms, but seldom on gymnosperms. Based on RNA-Seq data of the G. biloba transcriptome, amount to 17,579 unigenes longer than 300 bp were selected and analyzed from 68,547 candidates. The co...
BACKGROUND AND AIMS The mid-Cretaceous is a period of sudden turnover from gymnosperm to angiosperm-dominated floras. The aim was to investigate the fossil plant ecology in order to follow the spread of angiosperm taxa. METHODS Floristic lists and localities from the latest Albian-Cenomanian of Europe are analysed with Wagner's Parsimony Method, a clustering method currently used in phylogeny...
The study provides the first comprehensive record of plant megafossils mainly Glossopteris flora from Barakar Formation, Rajmahal Open Cast Mine, Basin, Jharkhand. assemblage is composed pteridophytes and gymnosperms. comprise Equisetalean axes (order Equisetales), whereas, gymnosperms include nine species including communis, G. damudica, gigas, indica, lanceolatus, longicaulis, oldhamii, taeni...
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