Not a lycopsid but a cycad-like plant: Iratinia australis gen. nov. et sp. nov. from the Irati Formation, Kungurian of the Paraná Basin, Brazil

Spiekermann, Rafael; Jasper, André; Siegloch, Anelise Marta; Guerra-Sommer, Margót; Uhl, Dieter

doi:10.1016/j.revpalbo.2021.104415

Cited by 5 publications

(3 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Fossil taxon and specimen: Cordaixylon iowensis Phylogenetic justification: Following Morris et al [ [5] C_42: Acrogymnospermae: Ginkgoopsida -Cycadopsida Fossil taxon and specimen: Iratinia australis [MCT1487-PB, Museu de Ciências da Terra, Rio de Janeiro, Brazil] from the Irati Formation of the Kungurian of the Paraná Basin, Brazil. Phylogenetic justification: Though initially proposed as a lycopsid [111], based on multiple morpho-anatomical traits Spiekermann et al [112] determined that I. australis belonged to the extant order Cycadales. Minimum age: 274 Ma Maximum age: 365.63 Ma Age justification: Material was collected from the Irati Formation, the lowermost unit of the Passa Dois Group [ref].…”

Section: C_40: Spermatophyta: Acrogymnospermae -Angiospermaementioning

confidence: 99%

Divergent evolutionary trajectories of bryophytes and tracheophytes from a complex common ancestor of land plants

Harris

Clark

Schrempf

et al. 2021

Preprint

View full text Add to dashboard Cite

The origin of plants and their colonization of land resulted in the transformation of the terrestrial environment. Here we investigate the evolution of the land plants (embryophytes) and their two main lineages, the tracheophytes (vascular plants) and bryophytes (non-vascular plants). We used new fossil calibrations, relative lineage dating implied by horizontal gene transfer, and new phylogenomic methods for mapping gene family origins. Distinct rooting strategies resolve tracheophytes and bryophytes as monophyletic sister groups that diverged during the Cambrian, 515-494 Ma. The embryophyte stem is characterised by a burst of gene innovation, while bryophytes subsequently experienced a no less dramatic episode of reductive genome evolution in which they lost genes associated with the elaboration of vasculature and the stomatal complex. Overall, our analyses confirm that extant tracheophytes and bryophytes are both highly derived; as a result, understanding the origin of land plants requires tracing character evolution across the diversity of modern lineages.

show abstract

Section: C_40: Spermatophyta: Acrogymnospermae -Angiospermaementioning

confidence: 99%

Divergent evolutionary trajectories of bryophytes and tracheophytes from a complex common ancestor of land plants

Harris

Clark

Schrempf

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…From a morphological perspective, the reproductive systems of cycads are most similar to those of spore plants, making cycads very important in studying the genesis and early evolution of seed plants. From the standpoint of their phylogenetic origin and evolution, cycads have existed and reproduced for at least 280 million years [4], suffered significant environmental changes, and contain a wealth of genetic data. In terms of species protection, cycads have persisted and flourished until the present, although many plant species have perished due to changes in the earth's environment.…”

Section: Introductionmentioning

confidence: 99%

“…The genus Cycas is the sole representative within the Cycadaceae family, encompassing approximately 120 species and exhibiting a complex taxonomy across a diverse geographical range [4]. Cycas are thought to have originated in Tertiary East Asia according to recent Forests 2023, 14, 2069 2 of 12 biogeographic research [5].…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of the Complete Chloroplast Genomes of Six Endangered Cycas Species: Genomic Features, Comparative Analysis, and Phylogenetic Implications

Tang,

Zou,

Chen

et al. 2023

Forests

View full text Add to dashboard Cite

Cycas (family Cycadaceae), which spread throughout tropical and subtropical regions, is crucial in conservation biology. Due to subtle morphological variations between species, a solid species-level phylogeny for Cycas is lacking. In the present study, we assembled and analyzed the chloroplast genomes of six Cycas plants, including their genome structure, GC content, and nucleotide diversity. The Cycas chloroplast genome spans from 162,038 to 162,159 bp and contains 131 genes, including 86 protein-coding genes, 37 transfer RNA (tRNA) genes, and 8 ribosomal RNA (rRNA) genes. Through a comparative analysis, we found that the chloroplast genome of Cycas was highly conserved, as indicated by the contraction and expansion of the inverted repeat (IR) regions and sequence polymorphisms. In addition, several non-coding sites (psbK-psbI, petN-psbM, trnE-UUC-psbD, ndhC-trnM-CAU, and rpl32-trnP-GGG) showed significant variation. The utilization of phylogenetic analysis relying on protein-coding genes has substantiated the division of Cycas primarily into four groups. The application of these findings will prove valuable in evaluating genetic diversity and the phylogenetic connections among closely related species. Moreover, it will provide essential support for the advancement of wild germplasm resources.

show abstract

Two new petrified gymnosperms with solenoid piths from the Pedra de Fogo Formation, Permian of Maranhão, Brazil

Conceição

Júnior

Iannuzzi

et al. 2022

Review of Palaeobotany and Palynology

View full text Add to dashboard Cite

Not a lycopsid but a cycad-like plant: Iratinia australis gen. nov. et sp. nov. from the Irati Formation, Kungurian of the Paraná Basin, Brazil

Cited by 5 publications

References 46 publications

Divergent evolutionary trajectories of bryophytes and tracheophytes from a complex common ancestor of land plants

Divergent evolutionary trajectories of bryophytes and tracheophytes from a complex common ancestor of land plants

Comparative Analysis of the Complete Chloroplast Genomes of Six Endangered Cycas Species: Genomic Features, Comparative Analysis, and Phylogenetic Implications

Two new petrified gymnosperms with solenoid piths from the Pedra de Fogo Formation, Permian of Maranhão, Brazil

Contact Info

Product

Resources

About