[Taxacom] Taxonomic treatment of cyanobacterial endosymbionts

Tony Rees tonyrees49 at gmail.com
Thu Jun 17 15:38:12 CDT 2021

Hi all,

The glaucophycean "algae" Glaucocystis nostochinearum and Cyanophora
paradoxa contain endosymbionts (cyanelles) resembling blue-green algae
(Cyanobacteria) that have been separately named in the past (by Hall and
Claus, 1963) as cyanobacteria in their own right, namely as Skujapelta nuda
(fam. Skujapeltaceae, order Chroococcales) in Glaucocystis, and Cyanocyta
korschikoffiana (fam. Cyanocytaceae, order Chroococcales), respectively.

In Index Nominum Genericorum, Skujapelta and Cyanocyta are retained in
Cyanobacteria, whereas in AlgaeBase (current version) Skujapelta is placed
in Glaucosphaerales (Rodophyta - not Glaucophyceae) but still in its own
family, while Cyanocyta is not mentioned.

So here is a puzzle: should the names for the cyanelles, i.e.  Skujapelta
and  Cyanocyta, be treated as "accepted" names, in their own families,
within Cyanobacteria, or synonyms of their host names and placed in
Glaucophyceae? What would you do, if interested in treating these names in
a system of higher taxonomy?

Comments welcome,

Regards - Tony
Tony Rees, New South Wales, Australia

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