I am usually inclined to believe Tom, but he is talking about a genus not a species or strain so it's difficult to believe Akineoscedesmus could exist yet have absolutely no mention on the internet across multiple search engines and algae resources. Maybe he spelt it wrong. Alga does get moved about and renamed a fair bit, perhaps it got recategorized as one of the 500 or so Chlamydomonas species. It's also hard to identify some algae using a microscope alone. If you scrape GDA off the glass you won't see a flagella because this gets absorbed so it appears as a green cell, like alot of other algae.
I hope he can provide some evidence for it's existance.