What kingdoms are blue-green, green & red algae?

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Red algae, classified within the broader context of algae, face ongoing challenges in taxonomy. While blue-green algae are categorized as bacteria and green algae as plants, red algae's classification remains uncertain. Current taxonomies suggest that if the kingdom Plantae is defined broadly to include Archaeplastida, red algae would belong there. However, if Plantae is restricted to Viridiplantae, red algae may be classified as their own kingdom or part of the kingdom Protista. The classification of Protista itself is under debate, with some suggesting it may now be divided into Protozoa or Chromista. Overall, the classification of red algae is still evolving, with little attention given to higher taxonomic levels in the 20th century.
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AIUI, there are these 3 types of algae, with blue-green algae being technically bacteria, green algae being plants, but what are red algae?
 
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Bystander said:
https://en.wikipedia.org/wiki/Red_algae

Hmmm. It looks like there's some problems with its classification:
Below are other published taxonomies of the red algae using molecular and traditional alpha taxonomic data; however, the taxonomy of the red algae is still in a state of flux (with classification above the level of order having received little scientific attention for most of the 20th century).[28]

  • If one defines the kingdom Plantae to mean the Archaeplastida, the red algae will be part of that kingdom
  • If Plantae are defined more narrowly, to be the Viridiplantae, then the red algae might be considered their own kingdom, or part of the kingdom Protista.
 
Drakkith said:
some problems with its classification:
Linnaean versus cladistic.o_O:wink:
 

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