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Ricardo Sousa Couto

Ricardo Sousa Couto
Rio de Janeiro City Hall · Secretariat of Environment.

PhD

About

32
Publications
12,095
Reads
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331
Citations
Research Experience
January 2012 - October 2018
Prefeitura Municipal do Rio de Janeiro
Position
  • Biólogo

Publications

Publications (32)
Article
Nineteen Neotropical species of the genus Dioscorea L. were subjected to palynological analysis with the objectives of increasing palynological knowledge and identifying characteristics with taxonomic and phylogenetic value. More specifically, the aim was to identify characters that distinguish species and help to resolve relationships among New Wo...
Article
We describe here Dioscorea medusae, a new species that occurs in rupicolous plant communities on rocky outcrops (inselbergs) in northwestern Espírito Santo State, in Southeastern Brazil. This new species is markedly different from all species of Dioscorea from the Neotropic and it differs by its numerous short racemes, and flowers with three stamen...
Article
Based on reproductive characters, two taxa are segregated from D. triangularis (Griseb.) R. Knuth: D. piperifolia var. triangularis and D. galiiflora, the latter previously known only by its type collection. Dioscorea galiiflora is here described, new occurrences are reported and its conservation status is assessed. We also provide nomenclatural no...
Article
Full-text available
The Global Strategy for Plant Conservation (GSPC) was established by the Conference of Parties in 2002 to decrease the loss of plant diversity, reduce poverty and contribute to sustainable development. To achieve this overarching goal, the GSPC has established a series of targets, one of which is to ensure that plant diversity is well understood, s...
Article
Full-text available
The Global Strategy for Plant Conservation (GSPC) was established by the Conference of Parties in 2002 to decrease the loss of plant diversity, reduce poverty and contribute to sustainable development. To achieve this overarching goal, the GSPC has established a series of targets, one of which is to ensure that plant diversity is well understood, s...
Article
Full-text available
The Global Strategy for Plant Conservation (GSPC) was established by the Conference of Parties in 2002 to decrease the loss of plant diversity, reduce poverty and contribute to sustainable development. To achieve this overarching goal, the GSPC has established a series of targets, one of which is to ensure that plant diversity is well understood, s...
Article
The yam genus Dioscorea comprises c. 650 species of tropical vines with starch-rich tubers, useful as an energy source and often containing secondary metabolites. The Neotropical region holds the highest diversity of species and morphology of yams. We generated a time calibrated tree for Dioscorea using, for the first time, a dense sampling of Neot...
Article
Full-text available
The study presents a floristic survey for the species of Dioscoreaceae recorded in the canga of Serra dos Carajás, Pará state. Detailed descriptions, identification key, photos, geographical distribution and morphological comments are provided for all species, as well comments on the habitat. Six species were recorded in the study area, all belongi...
Article
The yam genus Dioscorea comprises c. 650 species of tropical vines with starch-rich tubers, useful as an energy source and often containing secondary metabolites. The Neotropical region holds the highest diversity of species and morphology of yams. We generated a time calibrated tree for Dioscorea using, for the first time, a dense sampling of Neot...
Article
Due to its economic value and evolutionary importance among monocots and Dioscoreales, Dioscorea has been extensively studied phylogenetically. All analyses have produced congruent results resolving ten consistent main clades but were based solely on plastid data. Here we present the first phylogenetic tree of Dioscorea based on a low-copy nuclear...
Article
Due to its economic value and evolutionary importance among monocots and Dioscoreales, Dioscorea has been extensively studied phylogenetically. All analyses have produced congruent results resolving ten consistent main clades but were based solely on plastid data. Here we present the first phylogenetic tree of Dioscorea based on a low-copy nuclear...
Preprint
Full-text available
The yam genus Dioscorea comprises circa 650 species of tropical vines with starch rich tubers, usefull as an energy source and often containing secondary metabolites. The Neotropical Region holds the highest diversity of species and morphology of yams. We generated a time-calibrated tree for Dioscorea using, for the first time, a dense sampling of...
Article
New synonyms are proposed, references and authors of basionyms corrected, and changes made to some combinations recently proposed. Maranta insignis, Calathea violacea and Calathea koernickeana are hereby transferred to the genus Goeppertia and types are designated.
Article
Full-text available
We anatomically characterized the aerial stems of the genus Dioscorea and evaluated the use of these anatomical characteristics to better understand the taxonomy, systematics, and diversity of the component species in the neotropics. Fragments of the aerial stems of 23 species were collected for anatomical analyses utilizing conventional cytohistol...
Article
Full-text available
This work aims to contribute to the flora of Aizoaceae from Rio de Janeiro state. It is based on the analysis of herbarium specimens and fieldwork, a s well as on the relevant literature. One species were recorded: Sesuvium portulacastrum.Descriptions and comments, besides data on habitat and geographical distribution of the species are provided...
Article
Full-text available
This work aims to contribute to the Flora of Molluginaceae from Rio de Janeiro state. It is based on the analysis of herbarium specimens and fieldwork, as well as on the relevant literature. Two genera and three species were recorded: Glinus and Mollugo. Descriptions and comments, besides data on habitat and geographical distribution of the species...
Article
Full-text available
An updated inventory of Brazilian seed plants is presented and offers important insights into the country’s biodiversity. This work started in 2010, with the publication of the Plants and Fungi Catalogue, and has been updated since by more than 430 specialists working online. Brazil is home to 32,086 native Angiosperms and 23 native Gymnosperms, sh...
Article
Full-text available
Dioscorea flabellispina is endemic to small, low elevation fragments of the Atlantic Rainforest in southeastern Brazil, occurring on rocky outcrops in the states of Rio de Janeiro and Espirito Santo. Based on the number and form of thorns present on the stem (5–8 thorns with a fan-like form at the node), this new species is easily recognizable morp...
Article
Full-text available
Abstract— The Dioscoreaceae are widely distributed in the tropics, but despite the diversity and utility of the taxa of this family as food (e.g. yam) they are often poorly delimited morphologically and have complicated taxonomic issues. The Dioscorea campestris assemblage comprises 11 names in the literature, with considerable morphological variat...
Article
Full-text available
Dioscorea sphaeroidea is endemic to the high-altitude grasslands of the Serra dos Órgãos National Park located in southeastern Brazil. Based on the spheroid shape of its fruit and seed, i.e., not flattened or winged, this new species is morphologically unusual in the Dioscorea genus. Moreover, its unique morphology leaves this new species with no c...

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