<i>Paleoazolla</i>, a new heterosporous fern from the Upper Cretaceous of Argentina

Archangelsky, Ana; Phipps, Carlie J.; Taylor, Thomas N.; Taylor, Edith L.

doi:10.2307/2656984

Cited by 29 publications

(31 citation statements)

References 27 publications

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“…Modern and fossil Salviniaceae are aquatic, free-floating, heterosporous ferns [62]–[63]. Salviniaceous ferns were first identified from the La Colonia Formation based on megaspores and microspore massulae assigned to Paleoazolla patagonica from the Cerro Bosta locality [28]. Paleoazolla patagonica megaspores with preserved floats and microspore massulae with characteristic glochidia bearing recurved lateral barbs were found at all three La Colonia Formation localities sampled for this study (Figs.…”

Section: Methodsmentioning

confidence: 99%

“…Recently, however, a series of contributions describing aquatic macrophytes from the Maastrichtian La Colonia Formation of Patagonia, Argentina, have been published [28]–[29]–[30]–[31]–[32]–[33]. The La Colonia Formation paleoflora, currently documented from three localities that yield macrofossils, is interpreted as preserved in situ or after minimal transport given the excellent preservation of delicate plant organs.…”

Section: Introductionmentioning

confidence: 99%

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Late Cretaceous Aquatic Plant World in Patagonia, Argentina

et al. 2014

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In this contribution, we describe latest Cretaceous aquatic plant communities from the La Colonia Formation, Patagonia, Argentina, based on their taxonomic components and paleoecological attributes. The La Colonia Formation is a geological unit deposited during a Maastrichtian-Danian transgressive episode of the South Atlantic Ocean. This event resulted in the deposition of a series of fine-grained sediments associated with lagoon systems occurring along irregular coastal plains in northern Patagonia. These deposits preserved a diverse biota, including aquatic and terrestrial plants and animals. The aquatic macrophytes can be broadly divided into two groups: free-floating and rooted, the latter with emergent or floating leaves. Free-floating macrophytes include ferns in Salviniaceae (Azolla and Paleoazolla) and a monocot (Araceae). Floating microphytes include green algae (Botryoccocus, Pediastrum and Zygnemataceae). Among the rooted components, marsileaceous water ferns (including Regnellidium and an extinct form) and the eudicot angiosperm Nelumbo (Nelumbonaceae) are the dominant groups. Terrestrial plants occurring in the vegetation surrounding the lagoons include monocots (palms and Typhaceae), ferns with affinities to Dicksoniaceae, conifers, and dicots. A reconstruction of the aquatic plant paleocommuniy is provided based on the distribution of the fossils along a freshwater horizon within the La Colonia Formation. This contribution constitutes the first reconstruction of a Cretaceous aquatic habitat for southern South America.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Late Cretaceous Aquatic Plant World in Patagonia, Argentina

et al. 2014

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“…It belongs to a derived group of ferns Azollaceae and is closely related to several other aquatic taxa such as Salvinia and Marsilea ( 11 ). Its fossil history extends back to at least the Upper Cretaceous (1., 12.). It is one of the few pteridophyte lineages that have evolved heterospory (with male and female spores in different sizes), a condition that precedes evolution of the seed.…”

Section: Biology and Utilization Of Azollamentioning

confidence: 99%

Azolla — A Model Organism for Plant Genomic Studies

Qiu

2003

Genomics, Proteomics &Amp; Bioinformatics

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The aquatic ferns of the genus Azolla are nitrogen-fixing plants that have great potentials in agricultural production and environmental conservation. Azolla in many aspects is qualified to serve as a model organism for genomic studies because of its importance in agriculture, its unique position in plant evolution, its symbiotic relationship with the N2-fixing cyanobacterium, Anabaena azollae, and its moderate-sized genome. The goals of this genome project are not only to understand the biology of the Azolla genome to promote its applications in biological research and agriculture practice but also to gain critical insights about evolution of plant genomes. Together with the strategic and technical improvement as well as cost reduction of DNA sequencing, the deciphering of their genetic code is imminent.

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“…Salviniaceae from the Upper Cretaceous Patagonian deposits of Argentina include megaspore apparatuses and massulae of Paleoazolla patagonica Archangelsky et al, 1999 from the La Colonia Formation (Archangelsky et al, 1999;Cúneo et al, 2013Cúneo et al, , 2014 and dispersed massulae of Azolla, the latter including A. cretacea Stanley, 1965, A. (Rhizosperma) sp., Azollopsis polyancyra (Stough) Sweet andHills, 1974, A. circinata Oltz andHall, in Hall (1968) and A. spp.…”

Section: Introductionmentioning

confidence: 99%

Salviniales from the Late Cretaceous of the Golfo San Jorge Basin

Vallati

Tomas

Casal

et al. 2017

Cretaceous Research

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a b s t r a c tThe freshwater ferns (Salviniales) are well represented in the Maastrichtian deposits of Cerro de los Fragmentos in the headwaters of the Río Chico, Golfo San Jorge Basin. The fossil material of Salviniaceae includes complete megaspore apparatuses with attached microspore massulae and dispersed megaspores, float systems and microspore massulae of Azolla. The new species Azolla colhuehuapensis displays distinctive morphological characters including relative small megaspore apparatuses with easily detached floats and usually attached eglochidiate massulae. The Marsileaceae are represented by the megaspore Molaspora lobata, microspores of Crybelosporites and vegetative remains of Marsileaceaephyllum sp. The assemblage also includes zygospores of the green filamentous algae Zygnemataceae, spores of Marchantiophyta and Monilophyta (Schizaeales), megaspores of Isoetalean affinity and Palmtype angiosperm pollen grains. All these organic microfossils and the associated palynomorphs indicate the presence of a freshwater environment where abundant water ferns were developing and reproducing.

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Paleoazolla, a new heterosporous fern from the Upper Cretaceous of Argentina

Cited by 29 publications

References 27 publications

Late Cretaceous Aquatic Plant World in Patagonia, Argentina

Late Cretaceous Aquatic Plant World in Patagonia, Argentina

Azolla — A Model Organism for Plant Genomic Studies

Salviniales from the Late Cretaceous of the Golfo San Jorge Basin

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