Is Arthrospira the other name for Spirulina, or Spirulina is another genus of Cyanobacteria?

Both Arthrospira and Spirulina is the member of Cyanophyceae. But in some texts, Spirulina is considered as the supplement material of Arthrospira platensis. So, are these both the names of a single genus or is Spirulina the other genus of Cyanophyceae family.