Algal classes fall into several unrelated lineages, because algae are not a single natural group. Photosynthetic chromists, such as the diatoms and brown algae, were long classified as plants but are an independent evolutionary line that diverged from the same common ancestor as plants, fungi and animals, and they have chlorophyll c, which no plant group has. The green algae should not be a formal taxonomic group, since they are paraphyletic with respect to the plants, and one group, the charophytes, is more closely related to plants than to the other green algae. Green algae share chlorophylls a and b with plants.
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UC Museum of Paleontology: Systematics of the Chromista
UC Museum of PaleontologyChromista: SystematicsQuote, Chromista: Systematics
The Chromista appear to represent an independent evolutionary line that diverged from the same common ancestor as plants, fungi, and animals.
UC Museum of Paleontology: Systematics of the Green Algae, Part 1
UC Museum of PaleontologyGreen Algae: Systematics, Part 1Quote, Green Algae: Systematics, Part 1
since they are paraphyletic with respect to the Plantae
Wikipedia: Bacillariophyceae
WikipediaHas Member: Bacillariophyceae, LeadQuote, Has Member: Bacillariophyceae, Lead
Bacillariophyceae is a class of diatoms. Previously, this class was equivalent to Diatomeae, the taxonomic name for all diatoms.
Wikipedia: Chlorophyceae
Has Member: Chlorophyceae, LeadQuote, Has Member: Chlorophyceae, Lead
The Chlorophyceae, also known as chlorophycean algae, are one of the classes of green algae, within the phylum Chlorophyta.
Wikipedia: Dinophyceae
Has Member: Dinophyceae, LeadQuote, Has Member: Dinophyceae, Lead
Dinophyceae is a class of dinoflagellates.
Wikipedia: Charophyceae
WikipediaHas Member: Charophyceae, LeadQuote, Has Member: Charophyceae, Lead
Charophyceae is a class of charophyte green algae.
Wikipedia: Florideophyceae
WikipediaHas Member: Florideophyceae, LeadQuote, Has Member: Florideophyceae, Lead
Florideophyceae is a class of exclusively multicellular red algae.
Brown algae - Wikipedia
Has Member: Phaeophyceae, LeadQuote, Has Member: Phaeophyceae, Lead
Brown algae (sing.: alga) are a large group of photoautotrophic, multicellular SAR comprising the class Phaeophyceae.
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