Taxonomic novelties, new records, and rare species of desmids from the Chapada Diamantina region, Brazil

Ramos, Geraldo José Peixoto; Costa, Fabiana De Matos; Santos, Maria Aparecida dos; Moura, Carlos Wallace do Nascimento

doi:10.11646/phytotaxa.391.3.2

Cited by 4 publications

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“…Little is known on the current known diversity and distribution of that algal group in that northeastern Brazil's semiarid biome. Based only on taxonomic and floristic studies (Förster 1964;Ramos et al 2019;2020), there are only 13 taxa of Cosmarium reported to that domain (12 from Bahia and only one in Piaui), including some endemic taxa such as Cosmarium decedens var. bahiense, C. diamantinum, C. femmeasense, and C. subundulatum var.…”

Section: Introductionmentioning

confidence: 99%

How hidden is the diversity of the genus Cosmarium (Desmidiaceae) in the Brazilian Caatinga?

2021

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The Caatinga domain is the largest and most diverse tropical semiarid ecoregion of South America; however, little is known about the diversity of desmids it harbors, especially the genus Cosmarium (Desmidiaceae, Zygnematophyceae). Our study contributes to the knowledge of Cosmarium in the Caatinga through the report of 42 interesting taxa, including a new species (Cosmarium imperiale), 22 new records for South America, and 19 additions to the desmid flora from Brazil. The samples were gathered from periphytic material from the "Pantanal dos Marimbus" in the Chapada Diamantina region of Northeast Brazil. We provide taxonomic notes, ecological information, including habitat conditions with limnological data, and updated global distributions for all taxa of Cosmarium. A complementary quantitative study was performed during the last year of sampling ( 2018), which revealed that most taxa have their highest densities in the months with low precipitation and when the water's conductivity and transparency are greater. Our results also have implications for the conservation of the biota from Marimbus do Baiano and understand South America's desmids' biogeography since some rare taxa identified here were previously only known from other continents such as Europe and Africa.

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Section: Introductionmentioning

confidence: 99%