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- W154821148 abstract "Iara iguass, um novo taxon de angiosperma aquatica da paleoflora do Crato (Eocretaceo, Formacao Santana, Bacia do Araripe, nordeste do Brasil). Iara iguassu gen et sp. nov., uma angiosperma aquatica pertencente a paleoflora do Crato e descrita. A inedita planta fossil lanca nova luz ao estudo da morfologia, diversidade e evolucao das primeiras angiospermas do Cretaceo, ja que o Gondwana ocidental pode ter sido o cenario dispersor destas. O Membro Crato consiste em calcarios laminados de origem lacustre rasa com influencia marinha, de idade neoaptiana/eoalbiana. Os especimes, preservados como impressoes, consistem num caule cilindrico, articulado e sulcado, do qual emergem apicalmente folhas sesseis, arranjadas num verticilo. As longas folhas cilindricas, sulcadas e flexiveis portam apice arredondado ou filamentoso, alem de denteacoes papilosas marginais. Longos, delgados e estriados pedunculos emergem do no e terminam numa estrutura fusiforme, tambem estriada, representando estruturas ferteis flutuadoras. Caracteristicas similares parecem ser compartilhadas com as atuais familias de ervas aquaticas: Potamogetonaceae, Ruppiaceae e Cymodoceaceae (Monocots) e Podostemaceae (Eudicots). O habito aquatico e sugerido a partir da morfologia cilindrica, filamentosa e flexivel bem como da organizacao verticilada. A planta viveria parcialmente submersa em corpos lacustres, talvez em aguas salinas, paleoambientes ja descritos para o Membro Crato. Iara iguassu pode representar uma convergencia de habito e, assim, uma linhagem extinta de angiosperma aquatica, nao relacionada a monocots ou dicots." @default.
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- W154821148 date "2006-01-01" @default.
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- W154821148 title "Iara Iguassu, a new taxon of aquatic angiosperm from the crato palaeoflora (Lower Cretaceous, Santana Formation, Araripe Basin, Northeastern Brazil)" @default.
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