How to write virus, species, and other taxa names

If I am talking about beta/alpha coronaviruses in general, is it one word or two: e.g. 'beta coronaviruses' or 'betacoronaviruses'? (No italics, correct)?

Would Betacoronavirus only be capitalized when explicitly referring to the genus (i.e. ...the genus Betacoronavirus contains...

similarly, when talking about ebolaviruses in general (the various species within Ebolavirus ), is it one or two words: ebola viruses vs. ebolaviruses?

As for betacoronaviruses, my preference would be using a single word, ebolaviruses. But again, there is no official guideline. I see both usages in the literature, but the single word is more common.

Thank yo so much!

Thank yo so much!