Different species of plants and animals

[AngloScot]

"About 1.7 million species are known - we suspect there are anything from 10-30 million species on Earth," explained Dr Richard Lane, director of science at London's Natural History Museum.

 

 

I copied and pasted this from bbc science news because i wondered:

If we only know 1.7 million species out of about 10-30 million, then what are the others mostly made up of?? Plants? Insects? Birds? Fish?

[Clanad]

To date, taxonomists have identified less than two million distinct species, mostly mammals and birds. But it's estimated that the number of undiscovered species�primarily fish, fungi, insects, and microbes�ranges from ten million to more than one hundred million. Identifying the enormous numbers of microbes will probably account for the largest segment...

[newtron]

If you  want to discover a new species, become a microbiologist.  They are discovering new species every day.