Taxonomy problems on algae: Is Cryptophyta a Phylum or a Class rank?
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2.7 years ago

I am currently interested in algae taxonomy (I am not an expert in the field).

I retrieved the taxonomy of my sequences with their NCBI access number via the taxonkit software (

I noticed that I get Cryptophyta at the Class rank level.

For me -phyta actually corresponds more to the phylum rank.

I checked on NCBI site and is actually tidy in Class rank ( but for example on the algaebase database (, Cryptophyta is classified as Phylum.

Can you tell me why Cryptophyta is rank at the Class level on NCBI and not to the Phylum level ?

Conversely, I retrieve taxonomy with, for example, Phaeophyceae ranked at Phylum level ( 1 & unlock) while it is normally a Class on algaebase (

Do you have ideas being considered? I am very interested !

Thank you very much in advance for your answers.

Best regards

taxonomy ncbi algaebase Cryptophyta phylum • 790 views
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I think this problem might be better discussed at some biology stackexchange forum?

Also, NCBI taxonomy has the following disclaimer on each taxon page: "Disclaimer: The NCBI taxonomy database is not an authoritative source for nomenclature or classification - please consult the relevant scientific literature for the most reliable information."

Entering edit mode

Thank you very much for your answer. Indeed, I will ask the question on this forum. I quite agree to check in the literature, however when the problem is at the level of the taxonomic rank of the Phylum and on fairly well described groups I thought that there was a certain uniformity especially that in Federhen 2012 (The NCBI Taxonomy database), NBCI indicates that they make a link for algae with the taxonomy of the algaebase database ... that's why I ask myself these questions ...


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